777 lines
24 KiB
Java
777 lines
24 KiB
Java
package postgresql.jdbc1;
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// IMPORTANT NOTE: This file implements the JDBC 1 version of the driver.
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// If you make any modifications to this file, you must make sure that the
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// changes are also made (if relevent) to the related JDBC 2 class in the
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// postgresql.jdbc2 package.
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import java.lang.*;
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import java.io.*;
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import java.math.*;
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import java.text.*;
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import java.util.*;
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import java.sql.*;
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import postgresql.Field;
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import postgresql.largeobject.*;
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import postgresql.util.*;
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/**
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* A ResultSet provides access to a table of data generated by executing a
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* Statement. The table rows are retrieved in sequence. Within a row its
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* column values can be accessed in any order.
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*
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* <P>A ResultSet maintains a cursor pointing to its current row of data.
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* Initially the cursor is positioned before the first row. The 'next'
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* method moves the cursor to the next row.
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*
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* <P>The getXXX methods retrieve column values for the current row. You can
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* retrieve values either using the index number of the column, or by using
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* the name of the column. In general using the column index will be more
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* efficient. Columns are numbered from 1.
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*
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* <P>For maximum portability, ResultSet columns within each row should be read
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* in left-to-right order and each column should be read only once.
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*
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*<P> For the getXXX methods, the JDBC driver attempts to convert the
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* underlying data to the specified Java type and returns a suitable Java
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* value. See the JDBC specification for allowable mappings from SQL types
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* to Java types with the ResultSet getXXX methods.
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*
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* <P>Column names used as input to getXXX methods are case insenstive. When
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* performing a getXXX using a column name, if several columns have the same
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* name, then the value of the first matching column will be returned. The
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* column name option is designed to be used when column names are used in the
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* SQL Query. For columns that are NOT explicitly named in the query, it is
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* best to use column numbers. If column names were used there is no way for
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* the programmer to guarentee that they actually refer to the intended
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* columns.
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*
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* <P>A ResultSet is automatically closed by the Statement that generated it
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* when that Statement is closed, re-executed, or is used to retrieve the
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* next result from a sequence of multiple results.
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*
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* <P>The number, types and properties of a ResultSet's columns are provided by
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* the ResultSetMetaData object returned by the getMetaData method.
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*
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* @see ResultSetMetaData
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* @see java.sql.ResultSet
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*/
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public class ResultSet extends postgresql.ResultSet implements java.sql.ResultSet
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{
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/**
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* Create a new ResultSet - Note that we create ResultSets to
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* represent the results of everything.
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*
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* @param fields an array of Field objects (basically, the
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* ResultSet MetaData)
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* @param tuples Vector of the actual data
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* @param status the status string returned from the back end
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* @param updateCount the number of rows affected by the operation
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* @param cursor the positioned update/delete cursor name
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*/
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public ResultSet(Connection conn, Field[] fields, Vector tuples, String status, int updateCount)
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{
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super(conn,fields,tuples,status,updateCount);
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}
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/**
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* A ResultSet is initially positioned before its first row,
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* the first call to next makes the first row the current row;
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* the second call makes the second row the current row, etc.
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*
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* <p>If an input stream from the previous row is open, it is
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* implicitly closed. The ResultSet's warning chain is cleared
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* when a new row is read
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*
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* @return true if the new current is valid; false if there are no
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* more rows
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* @exception SQLException if a database access error occurs
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*/
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public boolean next() throws SQLException
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{
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if (++current_row >= rows.size())
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return false;
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this_row = (byte [][])rows.elementAt(current_row);
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return true;
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}
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/**
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* In some cases, it is desirable to immediately release a ResultSet
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* database and JDBC resources instead of waiting for this to happen
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* when it is automatically closed. The close method provides this
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* immediate release.
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*
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* <p><B>Note:</B> A ResultSet is automatically closed by the Statement
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* the Statement that generated it when that Statement is closed,
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* re-executed, or is used to retrieve the next result from a sequence
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* of multiple results. A ResultSet is also automatically closed
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* when it is garbage collected.
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*
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* @exception SQLException if a database access error occurs
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*/
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public void close() throws SQLException
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{
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// No-op
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}
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/**
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* A column may have the value of SQL NULL; wasNull() reports whether
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* the last column read had this special value. Note that you must
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* first call getXXX on a column to try to read its value and then
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* call wasNull() to find if the value was SQL NULL
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*
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* @return true if the last column read was SQL NULL
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* @exception SQLException if a database access error occurred
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*/
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public boolean wasNull() throws SQLException
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{
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return wasNullFlag;
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}
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/**
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* Get the value of a column in the current row as a Java String
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*
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* @param columnIndex the first column is 1, the second is 2...
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* @return the column value, null for SQL NULL
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* @exception SQLException if a database access error occurs
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*/
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public String getString(int columnIndex) throws SQLException
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{
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//byte[] bytes = getBytes(columnIndex);
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//
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//if (bytes == null)
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//return null;
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//return new String(bytes);
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if (columnIndex < 1 || columnIndex > fields.length)
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throw new PSQLException("postgresql.res.colrange");
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wasNullFlag = (this_row[columnIndex - 1] == null);
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if(wasNullFlag)
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return null;
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return new String(this_row[columnIndex - 1]);
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}
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/**
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* Get the value of a column in the current row as a Java boolean
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*
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* @param columnIndex the first column is 1, the second is 2...
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* @return the column value, false for SQL NULL
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* @exception SQLException if a database access error occurs
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*/
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public boolean getBoolean(int columnIndex) throws SQLException
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{
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String s = getString(columnIndex);
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if (s != null)
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{
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int c = s.charAt(0);
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return ((c == 't') || (c == 'T'));
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}
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return false; // SQL NULL
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}
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/**
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* Get the value of a column in the current row as a Java byte.
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*
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* @param columnIndex the first column is 1, the second is 2,...
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* @return the column value; 0 if SQL NULL
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* @exception SQLException if a database access error occurs
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*/
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public byte getByte(int columnIndex) throws SQLException
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{
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String s = getString(columnIndex);
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if (s != null)
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{
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try
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{
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return Byte.parseByte(s);
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} catch (NumberFormatException e) {
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throw new PSQLException("postgresql.res.badbyte",s);
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}
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}
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return 0; // SQL NULL
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}
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/**
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* Get the value of a column in the current row as a Java short.
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*
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* @param columnIndex the first column is 1, the second is 2,...
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* @return the column value; 0 if SQL NULL
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* @exception SQLException if a database access error occurs
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*/
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public short getShort(int columnIndex) throws SQLException
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{
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String s = getString(columnIndex);
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if (s != null)
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{
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try
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{
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return Short.parseShort(s);
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} catch (NumberFormatException e) {
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throw new PSQLException("postgresql.res.badshort",s);
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}
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}
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return 0; // SQL NULL
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}
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/**
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* Get the value of a column in the current row as a Java int.
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*
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* @param columnIndex the first column is 1, the second is 2,...
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* @return the column value; 0 if SQL NULL
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* @exception SQLException if a database access error occurs
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*/
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public int getInt(int columnIndex) throws SQLException
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{
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String s = getString(columnIndex);
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if (s != null)
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{
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try
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{
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return Integer.parseInt(s);
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} catch (NumberFormatException e) {
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throw new PSQLException ("postgresql.badint",s);
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}
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}
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return 0; // SQL NULL
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}
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/**
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* Get the value of a column in the current row as a Java long.
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*
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* @param columnIndex the first column is 1, the second is 2,...
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* @return the column value; 0 if SQL NULL
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* @exception SQLException if a database access error occurs
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*/
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public long getLong(int columnIndex) throws SQLException
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{
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String s = getString(columnIndex);
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if (s != null)
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{
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try
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{
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return Long.parseLong(s);
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} catch (NumberFormatException e) {
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throw new PSQLException ("postgresql.res.badlong",s);
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}
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}
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return 0; // SQL NULL
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}
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/**
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* Get the value of a column in the current row as a Java float.
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*
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* @param columnIndex the first column is 1, the second is 2,...
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* @return the column value; 0 if SQL NULL
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* @exception SQLException if a database access error occurs
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*/
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public float getFloat(int columnIndex) throws SQLException
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{
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String s = getString(columnIndex);
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if (s != null)
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{
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try
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{
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return Float.valueOf(s).floatValue();
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} catch (NumberFormatException e) {
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throw new PSQLException ("postgresql.res.badfloat",s);
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}
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}
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return 0; // SQL NULL
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}
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/**
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* Get the value of a column in the current row as a Java double.
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*
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* @param columnIndex the first column is 1, the second is 2,...
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* @return the column value; 0 if SQL NULL
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* @exception SQLException if a database access error occurs
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*/
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public double getDouble(int columnIndex) throws SQLException
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{
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String s = getString(columnIndex);
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if (s != null)
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{
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try
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{
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return Double.valueOf(s).doubleValue();
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} catch (NumberFormatException e) {
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throw new PSQLException ("postgresql.res.baddouble",s);
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}
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}
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return 0; // SQL NULL
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}
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/**
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* Get the value of a column in the current row as a
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* java.lang.BigDecimal object
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*
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* @param columnIndex the first column is 1, the second is 2...
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* @param scale the number of digits to the right of the decimal
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* @return the column value; if the value is SQL NULL, null
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* @exception SQLException if a database access error occurs
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*/
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public BigDecimal getBigDecimal(int columnIndex, int scale) throws SQLException
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{
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String s = getString(columnIndex);
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BigDecimal val;
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if (s != null)
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{
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try
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{
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val = new BigDecimal(s);
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} catch (NumberFormatException e) {
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throw new PSQLException ("postgresql.res.badbigdec",s);
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}
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try
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{
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return val.setScale(scale);
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} catch (ArithmeticException e) {
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throw new PSQLException ("postgresql.res.badbigdec",s);
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}
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}
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return null; // SQL NULL
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}
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/**
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* Get the value of a column in the current row as a Java byte array.
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*
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* <p>In normal use, the bytes represent the raw values returned by the
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* backend. However, if the column is an OID, then it is assumed to
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* refer to a Large Object, and that object is returned as a byte array.
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*
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* <p><b>Be warned</b> If the large object is huge, then you may run out
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* of memory.
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*
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* @param columnIndex the first column is 1, the second is 2, ...
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* @return the column value; if the value is SQL NULL, the result
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* is null
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* @exception SQLException if a database access error occurs
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*/
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public byte[] getBytes(int columnIndex) throws SQLException
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{
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if (columnIndex < 1 || columnIndex > fields.length)
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throw new PSQLException("postgresql.res.colrange");
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wasNullFlag = (this_row[columnIndex - 1] == null);
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// Handle OID's as BLOBS
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if(!wasNullFlag)
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if( fields[columnIndex - 1].getOID() == 26) {
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LargeObjectManager lom = connection.getLargeObjectAPI();
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LargeObject lob = lom.open(getInt(columnIndex));
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byte buf[] = lob.read(lob.size());
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lob.close();
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return buf;
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}
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return this_row[columnIndex - 1];
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}
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/**
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* Get the value of a column in the current row as a java.sql.Date
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* object
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*
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* @param columnIndex the first column is 1, the second is 2...
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* @return the column value; null if SQL NULL
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* @exception SQLException if a database access error occurs
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*/
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public java.sql.Date getDate(int columnIndex) throws SQLException
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{
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String s = getString(columnIndex);
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if(s==null)
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return null;
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SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
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try {
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return new java.sql.Date(df.parse(s).getTime());
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} catch (ParseException e) {
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throw new PSQLException("postgresql.res.baddate",new Integer(e.getErrorOffset()),s);
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}
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}
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/**
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* Get the value of a column in the current row as a java.sql.Time
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* object
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*
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* @param columnIndex the first column is 1, the second is 2...
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* @return the column value; null if SQL NULL
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* @exception SQLException if a database access error occurs
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*/
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public Time getTime(int columnIndex) throws SQLException
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{
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String s = getString(columnIndex);
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if (s != null)
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{
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try
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{
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if (s.length() != 5 && s.length() != 8)
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throw new NumberFormatException("Wrong Length!");
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int hr = Integer.parseInt(s.substring(0,2));
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int min = Integer.parseInt(s.substring(3,5));
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int sec = (s.length() == 5) ? 0 : Integer.parseInt(s.substring(6));
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return new Time(hr, min, sec);
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} catch (NumberFormatException e) {
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throw new PSQLException ("postgresql.res.badtime",s);
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}
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}
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return null; // SQL NULL
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}
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/**
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* Get the value of a column in the current row as a
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* java.sql.Timestamp object
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*
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* @param columnIndex the first column is 1, the second is 2...
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* @return the column value; null if SQL NULL
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* @exception SQLException if a database access error occurs
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*/
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public Timestamp getTimestamp(int columnIndex) throws SQLException
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{
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String s = getString(columnIndex);
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SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:sszzz");
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if (s != null)
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{
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int TZ = new Float(s.substring(19)).intValue();
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TZ = TZ * 60 * 60 * 1000;
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TimeZone zone = TimeZone.getDefault();
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zone.setRawOffset(TZ);
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String nm = zone.getID();
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s = s.substring(0,19) + nm;
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try {
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java.util.Date d = df.parse(s);
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return new Timestamp(d.getTime());
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} catch (ParseException e) {
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throw new PSQLException("postgresql.res.badtimestamp",new Integer(e.getErrorOffset()),s);
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}
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}
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return null; // SQL NULL
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}
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/**
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* A column value can be retrieved as a stream of ASCII characters
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* and then read in chunks from the stream. This method is
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* particular suitable for retrieving large LONGVARCHAR values.
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* The JDBC driver will do any necessary conversion from the
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* database format into ASCII.
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*
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* <p><B>Note:</B> All the data in the returned stream must be read
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* prior to getting the value of any other column. The next call
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* to a get method implicitly closes the stream. Also, a stream
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* may return 0 for available() whether there is data available
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* or not.
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*
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*<p> We implement an ASCII stream as a Binary stream - we should really
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* do the data conversion, but I cannot be bothered to implement this
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* right now.
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*
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* @param columnIndex the first column is 1, the second is 2, ...
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* @return a Java InputStream that delivers the database column
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* value as a stream of one byte ASCII characters. If the
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* value is SQL NULL then the result is null
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* @exception SQLException if a database access error occurs
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* @see getBinaryStream
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*/
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public InputStream getAsciiStream(int columnIndex) throws SQLException
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{
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return getBinaryStream(columnIndex);
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}
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/**
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* A column value can also be retrieved as a stream of Unicode
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* characters. We implement this as a binary stream.
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*
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* @param columnIndex the first column is 1, the second is 2...
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* @return a Java InputStream that delivers the database column value
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* as a stream of two byte Unicode characters. If the value is
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* SQL NULL, then the result is null
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* @exception SQLException if a database access error occurs
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* @see getAsciiStream
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* @see getBinaryStream
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*/
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public InputStream getUnicodeStream(int columnIndex) throws SQLException
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{
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return getBinaryStream(columnIndex);
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}
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/**
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* A column value can also be retrieved as a binary strea. This
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* method is suitable for retrieving LONGVARBINARY values.
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*
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* @param columnIndex the first column is 1, the second is 2...
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* @return a Java InputStream that delivers the database column value
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* as a stream of bytes. If the value is SQL NULL, then the result
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* is null
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* @exception SQLException if a database access error occurs
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* @see getAsciiStream
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* @see getUnicodeStream
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*/
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public InputStream getBinaryStream(int columnIndex) throws SQLException
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{
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byte b[] = getBytes(columnIndex);
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if (b != null)
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return new ByteArrayInputStream(b);
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return null; // SQL NULL
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}
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/**
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* The following routines simply convert the columnName into
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* a columnIndex and then call the appropriate routine above.
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*
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* @param columnName is the SQL name of the column
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* @return the column value
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* @exception SQLException if a database access error occurs
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*/
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public String getString(String columnName) throws SQLException
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{
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return getString(findColumn(columnName));
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}
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public boolean getBoolean(String columnName) throws SQLException
|
|
{
|
|
return getBoolean(findColumn(columnName));
|
|
}
|
|
|
|
public byte getByte(String columnName) throws SQLException
|
|
{
|
|
|
|
return getByte(findColumn(columnName));
|
|
}
|
|
|
|
public short getShort(String columnName) throws SQLException
|
|
{
|
|
return getShort(findColumn(columnName));
|
|
}
|
|
|
|
public int getInt(String columnName) throws SQLException
|
|
{
|
|
return getInt(findColumn(columnName));
|
|
}
|
|
|
|
public long getLong(String columnName) throws SQLException
|
|
{
|
|
return getLong(findColumn(columnName));
|
|
}
|
|
|
|
public float getFloat(String columnName) throws SQLException
|
|
{
|
|
return getFloat(findColumn(columnName));
|
|
}
|
|
|
|
public double getDouble(String columnName) throws SQLException
|
|
{
|
|
return getDouble(findColumn(columnName));
|
|
}
|
|
|
|
public BigDecimal getBigDecimal(String columnName, int scale) throws SQLException
|
|
{
|
|
return getBigDecimal(findColumn(columnName), scale);
|
|
}
|
|
|
|
public byte[] getBytes(String columnName) throws SQLException
|
|
{
|
|
return getBytes(findColumn(columnName));
|
|
}
|
|
|
|
public java.sql.Date getDate(String columnName) throws SQLException
|
|
{
|
|
return getDate(findColumn(columnName));
|
|
}
|
|
|
|
public Time getTime(String columnName) throws SQLException
|
|
{
|
|
return getTime(findColumn(columnName));
|
|
}
|
|
|
|
public Timestamp getTimestamp(String columnName) throws SQLException
|
|
{
|
|
return getTimestamp(findColumn(columnName));
|
|
}
|
|
|
|
public InputStream getAsciiStream(String columnName) throws SQLException
|
|
{
|
|
return getAsciiStream(findColumn(columnName));
|
|
}
|
|
|
|
public InputStream getUnicodeStream(String columnName) throws SQLException
|
|
{
|
|
return getUnicodeStream(findColumn(columnName));
|
|
}
|
|
|
|
public InputStream getBinaryStream(String columnName) throws SQLException
|
|
{
|
|
return getBinaryStream(findColumn(columnName));
|
|
}
|
|
|
|
/**
|
|
* The first warning reported by calls on this ResultSet is
|
|
* returned. Subsequent ResultSet warnings will be chained
|
|
* to this SQLWarning.
|
|
*
|
|
* <p>The warning chain is automatically cleared each time a new
|
|
* row is read.
|
|
*
|
|
* <p><B>Note:</B> This warning chain only covers warnings caused by
|
|
* ResultSet methods. Any warnings caused by statement methods
|
|
* (such as reading OUT parameters) will be chained on the
|
|
* Statement object.
|
|
*
|
|
* @return the first SQLWarning or null;
|
|
* @exception SQLException if a database access error occurs.
|
|
*/
|
|
public SQLWarning getWarnings() throws SQLException
|
|
{
|
|
return warnings;
|
|
}
|
|
|
|
/**
|
|
* After this call, getWarnings returns null until a new warning
|
|
* is reported for this ResultSet
|
|
*
|
|
* @exception SQLException if a database access error occurs
|
|
*/
|
|
public void clearWarnings() throws SQLException
|
|
{
|
|
warnings = null;
|
|
}
|
|
|
|
/**
|
|
* Get the name of the SQL cursor used by this ResultSet
|
|
*
|
|
* <p>In SQL, a result table is retrieved though a cursor that is
|
|
* named. The current row of a result can be updated or deleted
|
|
* using a positioned update/delete statement that references
|
|
* the cursor name.
|
|
*
|
|
* <p>JDBC supports this SQL feature by providing the name of the
|
|
* SQL cursor used by a ResultSet. The current row of a ResulSet
|
|
* is also the current row of this SQL cursor.
|
|
*
|
|
* <p><B>Note:</B> If positioned update is not supported, a SQLException
|
|
* is thrown.
|
|
*
|
|
* @return the ResultSet's SQL cursor name.
|
|
* @exception SQLException if a database access error occurs
|
|
*/
|
|
public String getCursorName() throws SQLException
|
|
{
|
|
return connection.getCursorName();
|
|
}
|
|
|
|
/**
|
|
* The numbers, types and properties of a ResultSet's columns are
|
|
* provided by the getMetaData method
|
|
*
|
|
* @return a description of the ResultSet's columns
|
|
* @exception SQLException if a database access error occurs
|
|
*/
|
|
public java.sql.ResultSetMetaData getMetaData() throws SQLException
|
|
{
|
|
return new ResultSetMetaData(rows, fields);
|
|
}
|
|
|
|
/**
|
|
* Get the value of a column in the current row as a Java object
|
|
*
|
|
* <p>This method will return the value of the given column as a
|
|
* Java object. The type of the Java object will be the default
|
|
* Java Object type corresponding to the column's SQL type, following
|
|
* the mapping specified in the JDBC specification.
|
|
*
|
|
* <p>This method may also be used to read database specific abstract
|
|
* data types.
|
|
*
|
|
* @param columnIndex the first column is 1, the second is 2...
|
|
* @return a Object holding the column value
|
|
* @exception SQLException if a database access error occurs
|
|
*/
|
|
public Object getObject(int columnIndex) throws SQLException
|
|
{
|
|
Field field;
|
|
|
|
if (columnIndex < 1 || columnIndex > fields.length)
|
|
throw new PSQLException("postgresql.res.colrange");
|
|
field = fields[columnIndex - 1];
|
|
|
|
// some fields can be null, mainly from those returned by MetaData methods
|
|
if(field==null) {
|
|
wasNullFlag=true;
|
|
return null;
|
|
}
|
|
|
|
switch (field.getSQLType())
|
|
{
|
|
case Types.BIT:
|
|
return new Boolean(getBoolean(columnIndex));
|
|
case Types.SMALLINT:
|
|
return new Integer(getInt(columnIndex));
|
|
case Types.INTEGER:
|
|
return new Integer(getInt(columnIndex));
|
|
case Types.BIGINT:
|
|
return new Long(getLong(columnIndex));
|
|
case Types.NUMERIC:
|
|
return getBigDecimal(columnIndex, 0);
|
|
case Types.REAL:
|
|
return new Float(getFloat(columnIndex));
|
|
case Types.DOUBLE:
|
|
return new Double(getDouble(columnIndex));
|
|
case Types.CHAR:
|
|
case Types.VARCHAR:
|
|
return getString(columnIndex);
|
|
case Types.DATE:
|
|
return getDate(columnIndex);
|
|
case Types.TIME:
|
|
return getTime(columnIndex);
|
|
case Types.TIMESTAMP:
|
|
return getTimestamp(columnIndex);
|
|
default:
|
|
return connection.getObject(field.getTypeName(), getString(columnIndex));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the value of a column in the current row as a Java object
|
|
*
|
|
*<p> This method will return the value of the given column as a
|
|
* Java object. The type of the Java object will be the default
|
|
* Java Object type corresponding to the column's SQL type, following
|
|
* the mapping specified in the JDBC specification.
|
|
*
|
|
* <p>This method may also be used to read database specific abstract
|
|
* data types.
|
|
*
|
|
* @param columnName is the SQL name of the column
|
|
* @return a Object holding the column value
|
|
* @exception SQLException if a database access error occurs
|
|
*/
|
|
public Object getObject(String columnName) throws SQLException
|
|
{
|
|
return getObject(findColumn(columnName));
|
|
}
|
|
|
|
/**
|
|
* Map a ResultSet column name to a ResultSet column index
|
|
*
|
|
* @param columnName the name of the column
|
|
* @return the column index
|
|
* @exception SQLException if a database access error occurs
|
|
*/
|
|
public int findColumn(String columnName) throws SQLException
|
|
{
|
|
int i;
|
|
|
|
for (i = 0 ; i < fields.length; ++i)
|
|
if (fields[i].name.equalsIgnoreCase(columnName))
|
|
return (i+1);
|
|
throw new PSQLException ("postgresql.res.colname",columnName);
|
|
}
|
|
}
|
|
|