mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Bring DatabaseMetaData feature tests up to date:

Browse Source 
* NULLs are sorted differently in 7.2
* table correlation names are supported
* GROUP BY, ORDER BY unrelated is supported since 6.4
* ESCAPE/LIKE only supported since 7.1
* outer joins only since 7.1
* preferred term for procedure is "function"
* preferred term for catalog is "database"
* supports SELECT for UPDATE since 6.5
* supports subqueries
* supports UNION; supports UNION ALL since 7.1
* update some of the max lengths to match reality
* rearrange some functions to match the order in the spec
  for easier maintenance
This commit is contained in:
Peter Eisentraut 2001-07-08 08:31:08 +00:00
parent ea88062c29
commit 2d9ee0fc55
2 changed files with 401 additions and 294 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

267
src/interfaces/jdbc/org/postgresql/jdbc1/DatabaseMetaData.java
View File

@ -46,6 +46,16 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
// This is a default value for remarks
private static final byte defaultRemarks[]="no remarks".getBytes();
private boolean haveMinimumServerVersion(String ver) throws SQLException
{
if (getDatabaseProductVersion().compareTo(ver)>=0)
return true;
else
return false;
}
public DatabaseMetaData(Connection conn)
{
this.connection = conn;
@ -116,7 +126,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean nullsAreSortedHigh() throws SQLException
{
return false;
return haveMinimumServerVersion("7.2");
}
/**
@ -149,7 +159,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean nullsAreSortedAtEnd() throws SQLException
{
return true;
return ! haveMinimumServerVersion("7.2");
}
/**
@ -305,10 +315,6 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
* case sensitive and as a result store them in mixed case? A
* JDBC compliant driver will always return true.
*
* <p>Predicament - what do they mean by "SQL identifiers" - if it
* means the names of the tables and columns, then the answers
* given below are correct - otherwise I don't know.
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
@ -355,9 +361,6 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
* a space if identifier quoting isn't supported. A JDBC Compliant
* driver will always use a double quote character.
*
* <p>If an SQL identifier is a table name, column name, etc. then
* we do not support it.
*
* @return the quoting string
* @exception SQLException if a database access error occurs
*/
@ -510,15 +513,27 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
return false;
}
/**
* Are table correlation names supported? A JDBC Compliant
* driver always returns true.
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsTableCorrelationNames() throws SQLException
{
// XXX-Not Implemented
return false;
return true;
}
/**
* If table correlation names are supported, are they restricted to
* be different from the names of the tables?
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsDifferentTableCorrelationNames() throws SQLException
{
// XXX-Not Implemented
return false;
}
@ -537,14 +552,13 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* Can an "ORDER BY" clause use columns not in the SELECT?
* I checked it, and you can't.
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsOrderByUnrelated() throws SQLException
{
return false;
return haveMinimumServerVersion("6.4");
}
/**
@ -561,14 +575,13 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* Can a "GROUP BY" clause use columns not in the SELECT?
* I checked it - it seems to allow it
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsGroupByUnrelated() throws SQLException
{
return true;
return haveMinimumServerVersion("6.4");
}
/**
@ -576,12 +589,14 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
* it specifies all the columns in the SELECT? Does anyone actually
* understand what they mean here?
*
* (I think this is a subset of the previous function. -- petere)
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsGroupByBeyondSelect() throws SQLException
{
return true; // For now...
return supportsGroupByUnrelated();
}
/**
@ -593,7 +608,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean supportsLikeEscapeClause() throws SQLException
{
return true;
return haveMinimumServerVersion("7.1");
}
/**
@ -681,8 +696,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* Does this driver support the ANSI-92 entry level SQL grammar?
* All JDBC Compliant drivers must return true. I think we have
* to support outer joins for this to be true.
* All JDBC Compliant drivers must return true.
*
* @return true if so
* @exception SQLException if a database access error occurs
@ -694,8 +708,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* Does this driver support the ANSI-92 intermediate level SQL
* grammar? Anyone who does not support Entry level cannot support
* Intermediate level.
* grammar?
*
* @return true if so
* @exception SQLException if a database access error occurs
@ -736,7 +749,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean supportsOuterJoins() throws SQLException
{
return true; // yes 7.1 does
return haveMinimumServerVersion("7.1");
}
/**
@ -748,7 +761,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean supportsFullOuterJoins() throws SQLException
{
return true; // yes in 7.1
return haveMinimumServerVersion("7.1");
}
/**
@ -760,44 +773,43 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean supportsLimitedOuterJoins() throws SQLException
{
return true; // yes in 7.1
return supportsFullOuterJoins();
}
/**
* What is the database vendor's preferred term for "schema" - well,
* we do not provide support for schemas, so lets just use that
* term.
* What is the database vendor's preferred term for "schema"?
* PostgreSQL doesn't have schemas, but when it does, we'll use the
* term "schema".
*
* @return the vendor term
* @exception SQLException if a database access error occurs
*/
public String getSchemaTerm() throws SQLException
{
return "Schema";
return "schema";
}
/**
* What is the database vendor's preferred term for "procedure" -
* I kind of like "Procedure" myself.
* What is the database vendor's preferred term for "procedure"?
* Traditionally, "function" has been used.
*
* @return the vendor term
* @exception SQLException if a database access error occurs
*/
public String getProcedureTerm() throws SQLException
{
return "Procedure";
return "function";
}
/**
* What is the database vendor's preferred term for "catalog"? -
* we dont have a preferred term, so just use Catalog
* What is the database vendor's preferred term for "catalog"?
*
* @return the vendor term
* @exception SQLException if a database access error occurs
*/
public String getCatalogTerm() throws SQLException
{
return "Catalog";
return "database";
}
/**
@ -809,21 +821,18 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean isCatalogAtStart() throws SQLException
{
return false;
throw org.postgresql.Driver.notImplemented();
}
/**
* What is the Catalog separator. Hmmm....well, I kind of like
* a period (so we get catalog.table definitions). - I don't think
* PostgreSQL supports catalogs anyhow, so it makes no difference.
* What is the Catalog separator.
*
* @return the catalog separator string
* @exception SQLException if a database access error occurs
*/
public String getCatalogSeparator() throws SQLException
{
// PM Sep 29 97 - changed from "." as we don't support catalogs.
return "";
throw org.postgresql.Driver.notImplemented();
}
/**
@ -959,68 +968,114 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
return false; // For now...
}
/**
* Is SELECT for UPDATE supported?
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsSelectForUpdate() throws SQLException
{
// XXX-Not Implemented
return false;
return haveMinimumServerVersion("6.5");
}
/**
* Are stored procedure calls using the stored procedure escape
* syntax supported?
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsStoredProcedures() throws SQLException
{
// XXX-Not Implemented
return false;
}
public boolean supportsSubqueriesInComparisons() throws SQLException
{
// XXX-Not Implemented
return false;
}
public boolean supportsSubqueriesInExists() throws SQLException
{
// XXX-Not Implemented
return false;
}
public boolean supportsSubqueriesInIns() throws SQLException
{
// XXX-Not Implemented
return false;
}
public boolean supportsSubqueriesInQuantifieds() throws SQLException
{
// XXX-Not Implemented
return false;
}
public boolean supportsCorrelatedSubqueries() throws SQLException
{
// XXX-Not Implemented
return false;
}
/**
* Is SQL UNION supported? Nope.
* Are subqueries in comparison expressions supported? A JDBC
* Compliant driver always returns true.
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsSubqueriesInComparisons() throws SQLException
{
return true;
}
/**
* Are subqueries in 'exists' expressions supported? A JDBC
* Compliant driver always returns true.
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsSubqueriesInExists() throws SQLException
{
return true;
}
/**
* Are subqueries in 'in' statements supported? A JDBC
* Compliant driver always returns true.
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsSubqueriesInIns() throws SQLException
{
return true;
}
/**
* Are subqueries in quantified expressions supported? A JDBC
* Compliant driver always returns true.
*
* (No idea what this is, but we support a good deal of
* subquerying.)
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsSubqueriesInQuantifieds() throws SQLException
{
return true;
}
/**
* Are correlated subqueries supported? A JDBC Compliant driver
* always returns true.
*
* (a.k.a. subselect in from?)
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsCorrelatedSubqueries() throws SQLException
{
return haveMinimumServerVersion("7.1");
}
/**
* Is SQL UNION supported?
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsUnion() throws SQLException
{
return true; // 7.0?
return true; // since 6.3
}
/**
* Is SQL UNION ALL supported? Nope.
* Is SQL UNION ALL supported?
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsUnionAll() throws SQLException
{
return false;
return haveMinimumServerVersion("7.1");
}
/**
@ -1081,7 +1136,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public int getMaxBinaryLiteralLength() throws SQLException
{
return 0; // For now...
return 0; // no limit
}
/**
@ -1093,7 +1148,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public int getMaxCharLiteralLength() throws SQLException
{
return 65535;
return 0; // no limit
}
/**
@ -1117,7 +1172,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public int getMaxColumnsInGroupBy() throws SQLException
{
return getMaxColumnsInTable();
return 0; // no limit
}
/**
@ -1135,26 +1190,24 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* What's the maximum number of columns in an "ORDER BY clause?
* Theoretically, all of them!
*
* @return the max columns
* @exception SQLException if a database access error occurs
*/
public int getMaxColumnsInOrderBy() throws SQLException
{
return getMaxColumnsInTable();
return 0; // no limit
}
/**
* What is the maximum number of columns in a "SELECT" list?
* Theoretically, all of them!
*
* @return the max columns
* @exception SQLException if a database access error occurs
*/
public int getMaxColumnsInSelect() throws SQLException
{
return getMaxColumnsInTable();
return 0; // no limit
}
/**
@ -1204,20 +1257,17 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
}
/**
* What is the maximum length of an index (in bytes)? Now, does
* the spec. mean name of an index (in which case its 32, the
* same as a table) or does it mean length of an index element
* (in which case its 8192, the size of a row) or does it mean
* the number of rows it can access (in which case it 2^32 -
* a 4 byte OID number)? I think its the length of an index
* element, personally, so Im setting it to 65535.
* Retrieves the maximum number of bytes for an index, including all
* of the parts of the index.
*
* @return max index length in bytes
* @return max index length in bytes, which includes the composite
* of all the constituent parts of the index; a result of zero means
* that there is no limit or the limit is not known
* @exception SQLException if a database access error occurs
*/
public int getMaxIndexLength() throws SQLException
{
return 65535;
return 0; // no limit (larger than an int anyway)
}
public int getMaxSchemaNameLength() throws SQLException
@ -1246,15 +1296,17 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
}
/**
* What is the maximum length of a single row? (not including
* blobs). 65535 is defined in PostgreSQL.
* What is the maximum length of a single row?
*
* @return max row size in bytes
* @exception SQLException if a database access error occurs
*/
public int getMaxRowSize() throws SQLException
{
return 65535;
if (haveMinimumServerVersion("7.1"))
return 1073741824; // 1 GB
else
return 8192; // XXX could be altered
}
/**
@ -1277,7 +1329,10 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public int getMaxStatementLength() throws SQLException
{
return 65535;
if (haveMinimumServerVersion("7.0"))
return 0; // actually whatever fits in size_t
else
return 16384;
}
/**
@ -1310,19 +1365,14 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* What is the maximum number of tables that can be specified
* in a SELECT? Theoretically, this is the same number as the
* number of tables allowable. In practice tho, it is much smaller
* since the number of tables is limited by the statement, we
* return 1024 here - this is just a number I came up with (being
* the number of tables roughly of three characters each that you
* can fit inside a 65535 character buffer with comma separators).
* in a SELECT?
*
* @return the maximum
* @exception SQLException if a database access error occurs
*/
public int getMaxTablesInSelect() throws SQLException
{
return 1024;
return 0; // no limit
}
/**
@ -1386,15 +1436,14 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* Are both data definition and data manipulation transactions
* supported? I checked it, and could not do a CREATE TABLE
* within a transaction, so I am assuming that we don't
* supported?
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsDataDefinitionAndDataManipulationTransactions() throws SQLException
{
return false;
return true;
}
/**
@ -1406,7 +1455,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean supportsDataManipulationTransactionsOnly() throws SQLException
{
return true;
return false;
}
/**

428
src/interfaces/jdbc/org/postgresql/jdbc2/DatabaseMetaData.java
View File

@ -46,6 +46,16 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
// This is a default value for remarks
private static final byte defaultRemarks[]="no remarks".getBytes();
private boolean haveMinimumServerVersion(String ver) throws SQLException
{
if (getDatabaseProductVersion().compareTo(ver)>=0)
return true;
else
return false;
}
public DatabaseMetaData(Connection conn)
{
this.connection = conn;
@ -116,7 +126,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean nullsAreSortedHigh() throws SQLException
{
return false;
return haveMinimumServerVersion("7.2");
}
/**
@ -149,7 +159,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean nullsAreSortedAtEnd() throws SQLException
{
return true;
return ! haveMinimumServerVersion("7.2");
}
/**
@ -305,10 +315,6 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
* case sensitive and as a result store them in mixed case? A
* JDBC compliant driver will always return true.
*
* <p>Predicament - what do they mean by "SQL identifiers" - if it
* means the names of the tables and columns, then the answers
* given below are correct - otherwise I don't know.
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
@ -355,9 +361,6 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
* a space if identifier quoting isn't supported. A JDBC Compliant
* driver will always use a double quote character.
*
* <p>If an SQL identifier is a table name, column name, etc. then
* we do not support it.
*
* @return the quoting string
* @exception SQLException if a database access error occurs
*/
@ -510,15 +513,27 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
return false;
}
/**
* Are table correlation names supported? A JDBC Compliant
* driver always returns true.
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsTableCorrelationNames() throws SQLException
{
// XXX-Not Implemented
return false;
return true;
}
/**
* If table correlation names are supported, are they restricted to
* be different from the names of the tables?
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsDifferentTableCorrelationNames() throws SQLException
{
// XXX-Not Implemented
return false;
}
@ -537,14 +552,13 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* Can an "ORDER BY" clause use columns not in the SELECT?
* I checked it, and you can't.
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsOrderByUnrelated() throws SQLException
{
return false;
return haveMinimumServerVersion("6.4");
}
/**
@ -561,14 +575,13 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* Can a "GROUP BY" clause use columns not in the SELECT?
* I checked it - it seems to allow it
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsGroupByUnrelated() throws SQLException
{
return true;
return haveMinimumServerVersion("6.4");
}
/**
@ -576,12 +589,14 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
* it specifies all the columns in the SELECT? Does anyone actually
* understand what they mean here?
*
* (I think this is a subset of the previous function. -- petere)
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsGroupByBeyondSelect() throws SQLException
{
return true; // For now...
return supportsGroupByUnrelated();
}
/**
@ -593,7 +608,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean supportsLikeEscapeClause() throws SQLException
{
return true;
return haveMinimumServerVersion("7.1");
}
/**
@ -681,8 +696,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* Does this driver support the ANSI-92 entry level SQL grammar?
* All JDBC Compliant drivers must return true. I think we have
* to support outer joins for this to be true.
* All JDBC Compliant drivers must return true.
*
* @return true if so
* @exception SQLException if a database access error occurs
@ -694,8 +708,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* Does this driver support the ANSI-92 intermediate level SQL
* grammar? Anyone who does not support Entry level cannot support
* Intermediate level.
* grammar?
*
* @return true if so
* @exception SQLException if a database access error occurs
@ -736,7 +749,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean supportsOuterJoins() throws SQLException
{
return true; // yes 7.1 does
return haveMinimumServerVersion("7.1");
}
/**
@ -748,7 +761,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean supportsFullOuterJoins() throws SQLException
{
return true; // yes in 7.1
return haveMinimumServerVersion("7.1");
}
/**
@ -760,44 +773,43 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean supportsLimitedOuterJoins() throws SQLException
{
return true; // yes in 7.1
return supportsFullOuterJoins();
}
/**
* What is the database vendor's preferred term for "schema" - well,
* we do not provide support for schemas, so lets just use that
* term.
* What is the database vendor's preferred term for "schema"?
* PostgreSQL doesn't have schemas, but when it does, we'll use the
* term "schema".
*
* @return the vendor term
* @exception SQLException if a database access error occurs
*/
public String getSchemaTerm() throws SQLException
{
return "Schema";
return "schema";
}
/**
* What is the database vendor's preferred term for "procedure" -
* I kind of like "Procedure" myself.
* What is the database vendor's preferred term for "procedure"?
* Traditionally, "function" has been used.
*
* @return the vendor term
* @exception SQLException if a database access error occurs
*/
public String getProcedureTerm() throws SQLException
{
return "Procedure";
return "function";
}
/**
* What is the database vendor's preferred term for "catalog"? -
* we dont have a preferred term, so just use Catalog
* What is the database vendor's preferred term for "catalog"?
*
* @return the vendor term
* @exception SQLException if a database access error occurs
*/
public String getCatalogTerm() throws SQLException
{
return "Catalog";
return "database";
}
/**
@ -809,21 +821,18 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean isCatalogAtStart() throws SQLException
{
return false;
throw org.postgresql.Driver.notImplemented();
}
/**
* What is the Catalog separator. Hmmm....well, I kind of like
* a period (so we get catalog.table definitions). - I don't think
* PostgreSQL supports catalogs anyhow, so it makes no difference.
* What is the Catalog separator.
*
* @return the catalog separator string
* @exception SQLException if a database access error occurs
*/
public String getCatalogSeparator() throws SQLException
{
// PM Sep 29 97 - changed from "." as we don't support catalogs.
return "";
throw org.postgresql.Driver.notImplemented();
}
/**
@ -959,68 +968,114 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
return false; // For now...
}
/**
* Is SELECT for UPDATE supported?
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsSelectForUpdate() throws SQLException
{
// XXX-Not Implemented
return false;
return haveMinimumServerVersion("6.5");
}
/**
* Are stored procedure calls using the stored procedure escape
* syntax supported?
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsStoredProcedures() throws SQLException
{
// XXX-Not Implemented
return false;
}
public boolean supportsSubqueriesInComparisons() throws SQLException
{
// XXX-Not Implemented
return false;
}
public boolean supportsSubqueriesInExists() throws SQLException
{
// XXX-Not Implemented
return false;
}
public boolean supportsSubqueriesInIns() throws SQLException
{
// XXX-Not Implemented
return false;
}
public boolean supportsSubqueriesInQuantifieds() throws SQLException
{
// XXX-Not Implemented
return false;
}
public boolean supportsCorrelatedSubqueries() throws SQLException
{
// XXX-Not Implemented
return false;
}
/**
* Is SQL UNION supported? Nope.
* Are subqueries in comparison expressions supported? A JDBC
* Compliant driver always returns true.
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsSubqueriesInComparisons() throws SQLException
{
return true;
}
/**
* Are subqueries in 'exists' expressions supported? A JDBC
* Compliant driver always returns true.
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsSubqueriesInExists() throws SQLException
{
return true;
}
/**
* Are subqueries in 'in' statements supported? A JDBC
* Compliant driver always returns true.
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsSubqueriesInIns() throws SQLException
{
return true;
}
/**
* Are subqueries in quantified expressions supported? A JDBC
* Compliant driver always returns true.
*
* (No idea what this is, but we support a good deal of
* subquerying.)
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsSubqueriesInQuantifieds() throws SQLException
{
return true;
}
/**
* Are correlated subqueries supported? A JDBC Compliant driver
* always returns true.
*
* (a.k.a. subselect in from?)
*
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsCorrelatedSubqueries() throws SQLException
{
return haveMinimumServerVersion("7.1");
}
/**
* Is SQL UNION supported?
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsUnion() throws SQLException
{
return true; // 7.0?
return true; // since 6.3
}
/**
* Is SQL UNION ALL supported? Nope.
* Is SQL UNION ALL supported?
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsUnionAll() throws SQLException
{
return false;
return haveMinimumServerVersion("7.1");
}
/**
@ -1081,7 +1136,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public int getMaxBinaryLiteralLength() throws SQLException
{
return 0; // For now...
return 0; // no limit
}
/**
@ -1093,7 +1148,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public int getMaxCharLiteralLength() throws SQLException
{
return 65535;
return 0; // no limit
}
/**
@ -1117,7 +1172,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public int getMaxColumnsInGroupBy() throws SQLException
{
return getMaxColumnsInTable();
return 0; // no limit
}
/**
@ -1135,26 +1190,24 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* What's the maximum number of columns in an "ORDER BY clause?
* Theoretically, all of them!
*
* @return the max columns
* @exception SQLException if a database access error occurs
*/
public int getMaxColumnsInOrderBy() throws SQLException
{
return getMaxColumnsInTable();
return 0; // no limit
}
/**
* What is the maximum number of columns in a "SELECT" list?
* Theoretically, all of them!
*
* @return the max columns
* @exception SQLException if a database access error occurs
*/
public int getMaxColumnsInSelect() throws SQLException
{
return getMaxColumnsInTable();
return 0; // no limit
}
/**
@ -1204,20 +1257,17 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
}
/**
* What is the maximum length of an index (in bytes)? Now, does
* the spec. mean name of an index (in which case its 32, the
* same as a table) or does it mean length of an index element
* (in which case its 8192, the size of a row) or does it mean
* the number of rows it can access (in which case it 2^32 -
* a 4 byte OID number)? I think its the length of an index
* element, personally, so Im setting it to 8192.
* Retrieves the maximum number of bytes for an index, including all
* of the parts of the index.
*
* @return max index length in bytes
* @return max index length in bytes, which includes the composite
* of all the constituent parts of the index; a result of zero means
* that there is no limit or the limit is not known
* @exception SQLException if a database access error occurs
*/
public int getMaxIndexLength() throws SQLException
{
return 65535;
return 0; // no limit (larger than an int anyway)
}
public int getMaxSchemaNameLength() throws SQLException
@ -1246,15 +1296,17 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
}
/**
* What is the maximum length of a single row? (not including
* blobs). 65535 is defined in PostgreSQL.
* What is the maximum length of a single row?
*
* @return max row size in bytes
* @exception SQLException if a database access error occurs
*/
public int getMaxRowSize() throws SQLException
{
return 65535;
if (haveMinimumServerVersion("7.1"))
return 1073741824; // 1 GB
else
return 8192; // XXX could be altered
}
/**
@ -1277,7 +1329,10 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public int getMaxStatementLength() throws SQLException
{
return 65535;
if (haveMinimumServerVersion("7.0"))
return 0; // actually whatever fits in size_t
else
return 16384;
}
/**
@ -1310,19 +1365,14 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* What is the maximum number of tables that can be specified
* in a SELECT? Theoretically, this is the same number as the
* number of tables allowable. In practice tho, it is much smaller
* since the number of tables is limited by the statement, we
* return 1024 here - this is just a number I came up with (being
* the number of tables roughly of three characters each that you
* can fit inside a 8192 character buffer with comma separators).
* in a SELECT?
*
* @return the maximum
* @exception SQLException if a database access error occurs
*/
public int getMaxTablesInSelect() throws SQLException
{
return 1024;
return 0; // no limit
}
/**
@ -1386,15 +1436,14 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
/**
* Are both data definition and data manipulation transactions
* supported? I checked it, and could not do a CREATE TABLE
* within a transaction, so I am assuming that we don't
* supported?
*
* @return true if so
* @exception SQLException if a database access error occurs
*/
public boolean supportsDataDefinitionAndDataManipulationTransactions() throws SQLException
{
return false;
return true;
}
/**
@ -1406,7 +1455,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
*/
public boolean supportsDataManipulationTransactionsOnly() throws SQLException
{
return true;
return false;
}
/**
@ -2699,27 +2748,99 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
return new ResultSet(connection, f, v, "OK", 1);
}
// ** JDBC 2 Extensions **
/**
* New in 7.1 - we don't support deletes so this must be false!
* Does the database support the given result set type?
*
* @param type - defined in java.sql.ResultSet
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean deletesAreDetected(int i) throws SQLException
public boolean supportsResultSetType(int type) throws SQLException
{
// The only type we don't support
return type != java.sql.ResultSet.TYPE_SCROLL_SENSITIVE;
}
/**
* Does the database support the concurrency type in combination
* with the given result set type?
*
* @param type - defined in java.sql.ResultSet
* @param concurrency - type defined in java.sql.ResultSet
* @return true if so; false otherwise
* @exception SQLException - if a database access error occurs
*/
public boolean supportsResultSetConcurrency(int type,int concurrency) throws SQLException
{
// These combinations are not supported!
if(type == java.sql.ResultSet.TYPE_SCROLL_SENSITIVE)
return false;
// We don't yet support Updateable ResultSets
if(concurrency == java.sql.ResultSet.CONCUR_UPDATABLE)
return false;
// Everything else we do
return true;
}
/* lots of unsupported stuff... */
public boolean ownUpdatesAreVisible(int type) throws SQLException
{
return false;
}
public boolean ownDeletesAreVisible(int type) throws SQLException
{
return false;
}
public boolean ownInsertsAreVisible(int type) throws SQLException
{
return false;
}
public boolean othersUpdatesAreVisible(int type) throws SQLException
{
return false;
}
/**
* New in 7.1 - we don't support deletes so this must be false!
*/
public boolean othersDeletesAreVisible(int i) throws SQLException
{
return false;
}
public java.sql.Connection getConnection() throws SQLException
public boolean othersInsertsAreVisible(int type) throws SQLException
{
return (java.sql.Connection)connection;
return false;
}
public boolean updatesAreDetected(int type) throws SQLException
{
return false;
}
public boolean deletesAreDetected(int i) throws SQLException
{
return false;
}
public boolean insertsAreDetected(int type) throws SQLException
{
return false;
}
/**
* New in 7.1 - If this is for PreparedStatement yes, ResultSet no
*/
public boolean supportsBatchUpdates() throws SQLException
{
return true;
}
/**
@ -2734,49 +2855,18 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
throw org.postgresql.Driver.notImplemented();
}
/**
* New in 7.1 - we don't support visible inserts so this must be false!
*/
public boolean othersInsertsAreVisible(int type) throws SQLException
{
return false;
}
/**
* New in 7.1 - we don't support visible updates so this must be false!
* Retrieves the connection that produced this metadata object.
*
* @return the connection that produced this metadata object
*/
public boolean updatesAreDetected(int type) throws SQLException
public java.sql.Connection getConnection() throws SQLException
{
return false;
return (java.sql.Connection)connection;
}
/**
* New in 7.1 - we don't support visible updates so this must be false!
*/
public boolean othersUpdatesAreVisible(int type) throws SQLException
{
return false;
}
public boolean ownUpdatesAreVisible(int type) throws SQLException
{
return false;
}
public boolean ownInsertsAreVisible(int type) throws SQLException
{
return false;
}
public boolean insertsAreDetected(int type) throws SQLException
{
return false;
}
public boolean ownDeletesAreVisible(int type) throws SQLException
{
return false;
}
/* I don't find these in the spec!?! */
public boolean rowChangesAreDetected(int type) throws SQLException
{
@ -2787,36 +2877,4 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
{
return false;
}
/**
* New in 7.1 - If this is for PreparedStatement yes, ResultSet no
*/
public boolean supportsBatchUpdates() throws SQLException
{
return true;
}
/**
* New in 7.1
*/
public boolean supportsResultSetConcurrency(int type,int concurrency) throws SQLException
{
// These combinations are not supported!
if(type==java.sql.ResultSet.TYPE_SCROLL_SENSITIVE)
return false;
// We don't yet support Updateable ResultSets
if(concurrency==java.sql.ResultSet.CONCUR_UPDATABLE)
return false;
// Everything else we do
return true;
}
public boolean supportsResultSetType(int type) throws SQLException
{
// The only type we don't support
return type!=java.sql.ResultSet.TYPE_SCROLL_SENSITIVE;
}
}