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There are a number of changes. The main ones are:

Browse Source 
return oid on insert
 handle all primitive data types
 handle single quotes and newlines in Strings
 handle null variables
 deal with non public and final variables (not very
   well, though)

Ken K
This commit is contained in:
Bruce Momjian 2001-05-24 15:48:32 +00:00
parent 23287c106d
commit 6f101c806b
1 changed files with 181 additions and 60 deletions
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167
src/interfaces/jdbc/org/postgresql/util/Serialize.java
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@ -41,8 +41,8 @@ public class Serialize
{
try {
conn = c;
tableName = type.toLowerCase();
className = toClassName(type);
tableName = toPostgreSQL(type);
className = type;
ourClass = Class.forName(className);
} catch(ClassNotFoundException cnfe) {
throw new PSQLException("postgresql.serial.noclass",type);
@ -50,7 +50,7 @@ public class Serialize
// Second check, the type must be a table
boolean status = false;
ResultSet rs = conn.ExecSQL("select typname from pg_type,pg_class where typname=relname and typname='"+type+"'");
ResultSet rs = conn.ExecSQL("select typname from pg_type,pg_class where typname=relname and typname='" + tableName + "'");
if(rs!=null) {
if(rs.next())
status=true;
@ -63,6 +63,22 @@ public class Serialize
// Finally cache the fields within the table
}
/**
* Constructor when Object is passed in
*/
public Serialize(org.postgresql.Connection c,Object o) throws SQLException
{
this(c, o.getClass().getName());
}
/**
* Constructor when Class is passed in
*/
public Serialize(org.postgresql.Connection c, Class cls) throws SQLException
{
this(c, cls.getName());
}
/**
* This fetches an object from a table, given it's OID
* @param oid The oid of the object
@ -76,11 +92,17 @@ public class Serialize
// NB: we use java.lang.reflect here to prevent confusion with
// the org.postgresql.Field
java.lang.reflect.Field f[] = ourClass.getDeclaredFields();
// used getFields to get only public fields. We have no way to set values
// for other declarations. Maybe look for setFieldName() methods?
java.lang.reflect.Field f[] = ourClass.getFields();
boolean hasOID=false;
int oidFIELD=-1;
StringBuffer sb = new StringBuffer("select");
char sep=' ';
// build a select for the fields. Look for the oid field to use in the where
for(int i=0;i<f.length;i++) {
String n = f[i].getName();
if(n.equals("oid")) {
@ -101,9 +123,33 @@ public class Serialize
if(rs!=null) {
if(rs.next()) {
for(int i=0;i<f.length;i++) {
if ( !Modifier.isFinal(f[i].getModifiers()) ) {
if (f[i].getType().getName().equals("short")){
f[i].setShort(obj, rs.getShort(i+1));
}
else
if (f[i].getType().getName().equals("char")){
f[i].setChar(obj, rs.getString(i+1).toCharArray()[0]);
}
else
if (f[i].getType().getName().equals("byte")){
f[i].setByte(obj, rs.getByte(i+1));
}
else
// booleans come out of pgsql as a t or an f
if (f[i].getType().getName().equals("boolean")){
if ( rs.getString(i+1).equals("t"))
f[i].setBoolean(obj, true);
else
f[i].setBoolean(obj, false);
}
else{
f[i].set(obj,rs.getObject(i+1));
}
}
}
}
rs.close();
} else
throw new PSQLException("postgresql.unexpected");
@ -138,7 +184,10 @@ public class Serialize
try {
// NB: we use java.lang.reflect here to prevent confusion with
// the org.postgresql.Field
java.lang.reflect.Field f[] = ourClass.getDeclaredFields();
// don't save private fields since we would not be able to fetch them
java.lang.reflect.Field f[] = ourClass.getFields();
boolean hasOID=false;
int oidFIELD=-1;
boolean update=false;
@ -155,7 +204,7 @@ public class Serialize
}
}
StringBuffer sb = new StringBuffer(update?"update "+tableName+" set":"insert into "+tableName+" values ");
StringBuffer sb = new StringBuffer(update?"update "+tableName+" set":"insert into " + tableName);
char sep=update?' ':'(';
for(int i=0;i<f.length;i++) {
String n = f[i].getName();
@ -164,9 +213,15 @@ public class Serialize
sep=',';
if(update) {
sb.append('=');
if(f[i].getType().getName().equals("java.lang.String")) {
// handle unset values
if (f[i].get(o) == null)
sb.append("null");
else
if(f[i].getType().getName().equals("java.lang.String") ||
f[i].getType().getName().equals("char")) {
sb.append('\'');
sb.append(f[i].get(o).toString());
// don't allow single qoutes or newlines in the string
sb.append(fixString(f[i].get(o).toString()));
sb.append('\'');
} else
sb.append(f[i].get(o).toString());
@ -177,10 +232,17 @@ public class Serialize
sb.append(") values ");
sep='(';
for(int i=0;i<f.length;i++) {
String n = f[i].getName();
if(f[i].getType().getName().equals("java.lang.String")) {
sb.append(sep);
sep=',';
// handle unset values
if (f[i].get(o) == null)
sb.append("null");
else
if(f[i].getType().getName().equals("java.lang.String") ||
f[i].getType().getName().equals("char")) {
sb.append('\'');
sb.append(f[i].get(o).toString());
// don't allow single quotes or newlines in the string
sb.append(fixString(f[i].get(o).toString()));
sb.append('\'');
} else
sb.append(f[i].get(o).toString());
@ -189,17 +251,23 @@ public class Serialize
}
DriverManager.println("store: "+sb.toString());
ResultSet rs = conn.ExecSQL(sb.toString());
if(rs!=null) {
rs.close();
}
org.postgresql.ResultSet rs = (org.postgresql.ResultSet)conn.ExecSQL(sb.toString());
// fetch the OID for returning
int oid=0;
if(hasOID) {
// set the oid in the object
// If an update use the existing oid in the object
f[oidFIELD].setInt(o,oid);
}
else {
String statStr = rs.getStatusString();
oid = Integer.parseInt(statStr.substring(statStr.indexOf(" ") + 1, statStr.lastIndexOf(" ")));
}
if(rs!=null) {
rs.close();
}
return oid;
} catch(IllegalAccessException iae) {
@ -207,6 +275,46 @@ public class Serialize
}
}
/**
*
*/
private String fixString(String s) {
int idx = -1;
// handle null
if (s == null)
return "";
// if the string has single quotes in it escape them
if ((idx = s.indexOf("'")) > -1) {
StringBuffer buf = new StringBuffer();
StringTokenizer tok = new StringTokenizer(s, "'");
// handle quote as 1St charater
if (idx > 0) buf.append(tok.nextToken());
while(tok.hasMoreTokens())
buf.append("\\'").append(tok.nextToken());
s = buf.toString();
}
// if the string has newlines in it convert them to \n
if ((idx = s.indexOf("\n")) > -1) {
StringBuffer buf = new StringBuffer();
StringTokenizer tok = new StringTokenizer(s, "\n");
if (idx > 0) buf.append(tok.nextToken());
while(tok.hasMoreTokens())
buf.append("\\n").append(tok.nextToken());
s = buf.toString();
}
return s;
}
/**
* This method is not used by the driver, but it creates a table, given
* a Serializable Java Object. It should be used before serializing any
@ -238,14 +346,15 @@ public class Serialize
ResultSet rs = con.ExecSQL("select relname from pg_class where relname = '"+tableName+"'");
if(!rs.next()) {
DriverManager.println("found "+rs.getString(1));
// DriverManager.println("found "+rs.getString(1));
// No entries returned, so the table doesn't exist
StringBuffer sb = new StringBuffer("create table ");
sb.append(tableName);
char sep='(';
java.lang.reflect.Field[] fields = c.getDeclaredFields();
// java.lang.reflect.Field[] fields = c.getDeclaredFields();
java.lang.reflect.Field[] fields = c.getFields();
for(int i=0;i<fields.length;i++) {
Class type = fields[i].getType();
@ -261,13 +370,13 @@ public class Serialize
} else {
// convert the java type to org.postgresql, recursing if a class
// is found
String n = fields[i].getType().getName();
String n = type.getName();
int j=0;
for(;j<tp.length && !tp[j][0].equals(n);j++);
if(j<tp.length)
sb.append(tp[j][1]);
else {
create(con,fields[i].getType());
create(con, type);
sb.append(toPostgreSQL(n));
}
}
@ -286,17 +395,21 @@ public class Serialize
// This is used to translate between Java primitives and PostgreSQL types.
private static final String tp[][] = {
{"boolean", "int1"},
// {"boolean", "int1"},
{"boolean", "bool"},
{"double", "float8"},
{"float", "float4"},
{"int", "int4"},
{"long", "int4"},
// {"long", "int4"},
{"long", "int8"},
{"short", "int2"},
{"java.lang.String", "text"},
{"java.lang.Integer", "int4"},
{"java.lang.Float", "float4"},
{"java.lang.Double", "float8"},
{"java.lang.Short", "int2"}
{"java.lang.Short", "int2"},
{"char", "char"},
{"byte", "int2"}
};
/**
@ -318,8 +431,16 @@ public class Serialize
if(name.indexOf("_")>-1)
throw new PSQLException("postgresql.serial.underscore");
// Postgres table names can only be 32 character long
// If the full class name with package is too long
// then just use the class name. If the class name is
// too long throw an exception.
if(name.length() > 32) {
name = name.substring(name.lastIndexOf(".") + 1);
if(name.length()>32)
throw new PSQLException("postgresql.serial.namelength",name,new Integer(name.length()));
}
return name.replace('.','_');
}