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Commit1ebbfc1

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Attached is the patch requested by Tom Lane (see below). It
includes two changes in the JDBC driver:1) When connected to a backend >= 7.2: use obj_description() andcol_description() instead of direct access to pg_description.2) In DatabaseMetaData.getTables()/getColumns()/getProcedures():when there is no comment on the object, return null in theREMARKS column of the ResultSet, instead of the default string"no remarks".Change 2 first appeared as a side-effect of change 1, but it isactually more compliant with the JDBC spec: "String objectcontaining an explanatory comment on the table/column/procedure,which may be null". The default string "no remarks" was strictlyspeaking incorrect, as it could not be distinguished from a realuser comment "no remarks". So I removed the default stringcompletely.Change 2 might break existing code that doesn't follow the JDBCspec and isn't prepared to handle a null in the REMARKS columnof getTables()/getColumns()/getProcedures.Patch tested with jdbc2 against both a 7.1 and a CVS tipbackend. I did not have a jdbc1 environment to build and testwith, but since the touched code is identical in jdbc1 and jdbc2I don't foresee any problems.Regards,Ren? Pijlman
1 parentb5453fa commit1ebbfc1

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2 files changed

+64
-39
lines changed

2 files changed

+64
-39
lines changed

‎src/interfaces/jdbc/org/postgresql/jdbc1/DatabaseMetaData.java‎

Lines changed: 32 additions & 20 deletions
Original file line numberDiff line numberDiff line change
@@ -43,10 +43,6 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
4343
staticfinalintiInt4Oid =23;// OID for int4
4444
staticfinalintVARHDRSZ =4;// length for int4
4545

46-
// This is a default value for remarks
47-
privatestaticfinalbytedefaultRemarks[]="no remarks".getBytes();
48-
49-
5046
publicDatabaseMetaData(Connectionconn)
5147
{
5248
this.connection =conn;
@@ -1517,8 +1513,6 @@ public java.sql.ResultSet getProcedures(String catalog, String schemaPattern, St
15171513
java.sql.ResultSetr;// ResultSet for the SQL query that we need to do
15181514
Vectorv =newVector();// The new ResultSet tuple stuff
15191515

1520-
byteremarks[] =defaultRemarks;
1521-
15221516
f[0] =newField(connection,"PROCEDURE_CAT",iVarcharOid,32);
15231517
f[1] =newField(connection,"PROCEDURE_SCHEM",iVarcharOid,32);
15241518
f[2] =newField(connection,"PROCEDURE_NAME",iVarcharOid,32);
@@ -1540,7 +1534,7 @@ public java.sql.ResultSet getProcedures(String catalog, String schemaPattern, St
15401534
tuple[1] =null;// Schema name
15411535
tuple[2] =r.getBytes(1);// Procedure name
15421536
tuple[3] =tuple[4] =tuple[5] =null;// Reserved
1543-
tuple[6] =remarks;// Remarks
1537+
tuple[6] =null;// Remarks
15441538

15451539
if (r.getBoolean(2))
15461540
tuple[7] =Integer.toString(java.sql.DatabaseMetaData.procedureReturnsResult).getBytes();
@@ -1684,6 +1678,7 @@ public java.sql.ResultSet getTables(String catalog, String schemaPattern, String
16841678

16851679
// Now form the query
16861680
StringBuffersql =newStringBuffer("select relname,oid,relkind from pg_class where (");
1681+
16871682
booleannotFirst=false;
16881683
for(inti=0;i<types.length;i++) {
16891684
for(intj=0;j<getTableTypes.length;j++)
@@ -1704,19 +1699,24 @@ public java.sql.ResultSet getTables(String catalog, String schemaPattern, String
17041699
// Now run the query
17051700
r =connection.ExecSQL(sql.toString());
17061701

1707-
byteremarks[];
1708-
17091702
while (r.next())
17101703
{
17111704
byte[][]tuple =newbyte[5][0];
17121705

17131706
// Fetch the description for the table (if any)
1714-
java.sql.ResultSetdr =connection.ExecSQL("select description from pg_description where objoid="+r.getInt(2));
1707+
StringgetDescriptionStatement =
1708+
connection.haveMinimumServerVersion("7.2") ?
1709+
"select obj_description("+r.getInt(2)+",'pg_class')" :
1710+
"select description from pg_description where objoid=" +r.getInt(2);
1711+
1712+
java.sql.ResultSetdr =connection.ExecSQL(getDescriptionStatement);
1713+
1714+
byteremarks[] =null;
1715+
17151716
if(((org.postgresql.ResultSet)dr).getTupleCount()==1) {
17161717
dr.next();
17171718
remarks =dr.getBytes(1);
1718-
}else
1719-
remarks =defaultRemarks;
1719+
}
17201720
dr.close();
17211721

17221722
StringrelKind;
@@ -1919,22 +1919,35 @@ public java.sql.ResultSet getColumns(String catalog, String schemaPattern, Strin
19191919
if (columnNamePattern ==null)columnNamePattern="%";
19201920

19211921
// Now form the query
1922-
// Modified by Stefan Andreasen <stefan@linux.kapow.dk>
1923-
r =connection.ExecSQL("select a.oid,c.relname,a.attname,a.atttypid,a.attnum,a.attnotnull,a.attlen,a.atttypmod,d.adsrc from pg_class c,pg_attribute a,pg_attrdef d where a.attrelid=c.oid and c.relname like '"+tableNamePattern.toLowerCase()+"' and a.attname like '"+columnNamePattern.toLowerCase()+"' and a.attnum>0 and c.oid=d.adrelid and d.adnum=a.attnum order by c.relname,a.attnum");
1924-
1925-
byteremarks[];
1922+
Stringquery =
1923+
"select " +
1924+
(connection.haveMinimumServerVersion("7.2") ?"a.attrelid" :"a.oid") +
1925+
",c.relname,a.attname,a.atttypid," +
1926+
"a.attnum,a.attnotnull,a.attlen,a.atttypmod,d.adsrc from pg_class c," +
1927+
"pg_attribute a,pg_attrdef d where a.attrelid=c.oid and " +
1928+
"c.relname like '"+tableNamePattern.toLowerCase()+"' and " +
1929+
"a.attname like '"+columnNamePattern.toLowerCase()+"' and " +
1930+
"a.attnum>0 and c.oid=d.adrelid and d.adnum=a.attnum " +
1931+
"order by c.relname,a.attnum";
1932+
1933+
r =connection.ExecSQL(query);
19261934

19271935
while(r.next()) {
19281936
byte[][]tuple =newbyte[18][0];
19291937

19301938
// Fetch the description for the table (if any)
1931-
java.sql.ResultSetdr =connection.ExecSQL("select description from pg_description where objoid="+r.getInt(1));
1939+
StringgetDescriptionStatement =
1940+
connection.haveMinimumServerVersion("7.2") ?
1941+
"select col_description(" +r.getInt(1) +"," +r.getInt(5) +")" :
1942+
"select description from pg_description where objoid=" +r.getInt(1);
1943+
1944+
java.sql.ResultSetdr =connection.ExecSQL(getDescriptionStatement);
1945+
19321946
if(((org.postgresql.ResultSet)dr).getTupleCount()==1) {
19331947
dr.next();
19341948
tuple[11] =dr.getBytes(1);
19351949
}else
1936-
tuple[11] =defaultRemarks;
1937-
1950+
tuple[11] =null;
19381951
dr.close();
19391952

19401953
tuple[0] ="".getBytes();// Catalog name
@@ -1985,7 +1998,6 @@ public java.sql.ResultSet getColumns(String catalog, String schemaPattern, Strin
19851998
r.close();
19861999
returnnewResultSet(connection,f,v,"OK",1);
19872000
}
1988-
19892001
/**
19902002
* Get a description of the access rights for a table's columns.
19912003
*

‎src/interfaces/jdbc/org/postgresql/jdbc2/DatabaseMetaData.java‎

Lines changed: 32 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -43,10 +43,6 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
4343
staticfinalintiInt4Oid =23;// OID for int4
4444
staticfinalintVARHDRSZ =4;// length for int4
4545

46-
// This is a default value for remarks
47-
privatestaticfinalbytedefaultRemarks[]="no remarks".getBytes();
48-
49-
5046
publicDatabaseMetaData(Connectionconn)
5147
{
5248
this.connection =conn;
@@ -1517,8 +1513,6 @@ public java.sql.ResultSet getProcedures(String catalog, String schemaPattern, St
15171513
java.sql.ResultSetr;// ResultSet for the SQL query that we need to do
15181514
Vectorv =newVector();// The new ResultSet tuple stuff
15191515

1520-
byteremarks[] =defaultRemarks;
1521-
15221516
f[0] =newField(connection,"PROCEDURE_CAT",iVarcharOid,32);
15231517
f[1] =newField(connection,"PROCEDURE_SCHEM",iVarcharOid,32);
15241518
f[2] =newField(connection,"PROCEDURE_NAME",iVarcharOid,32);
@@ -1540,7 +1534,7 @@ public java.sql.ResultSet getProcedures(String catalog, String schemaPattern, St
15401534
tuple[1] =null;// Schema name
15411535
tuple[2] =r.getBytes(1);// Procedure name
15421536
tuple[3] =tuple[4] =tuple[5] =null;// Reserved
1543-
tuple[6] =remarks;// Remarks
1537+
tuple[6] =null;
15441538

15451539
if (r.getBoolean(2))
15461540
tuple[7] =Integer.toString(java.sql.DatabaseMetaData.procedureReturnsResult).getBytes();
@@ -1684,6 +1678,7 @@ public java.sql.ResultSet getTables(String catalog, String schemaPattern, String
16841678

16851679
// Now form the query
16861680
StringBuffersql =newStringBuffer("select relname,oid,relkind from pg_class where (");
1681+
16871682
booleannotFirst=false;
16881683
for(inti=0;i<types.length;i++) {
16891684
for(intj=0;j<getTableTypes.length;j++)
@@ -1704,19 +1699,24 @@ public java.sql.ResultSet getTables(String catalog, String schemaPattern, String
17041699
// Now run the query
17051700
r =connection.ExecSQL(sql.toString());
17061701

1707-
byteremarks[];
1708-
17091702
while (r.next())
17101703
{
17111704
byte[][]tuple =newbyte[5][0];
17121705

17131706
// Fetch the description for the table (if any)
1714-
java.sql.ResultSetdr =connection.ExecSQL("select description from pg_description where objoid="+r.getInt(2));
1707+
StringgetDescriptionStatement =
1708+
connection.haveMinimumServerVersion("7.2") ?
1709+
"select obj_description("+r.getInt(2)+",'pg_class')" :
1710+
"select description from pg_description where objoid=" +r.getInt(2);
1711+
1712+
java.sql.ResultSetdr =connection.ExecSQL(getDescriptionStatement);
1713+
1714+
byteremarks[] =null;
1715+
17151716
if(((org.postgresql.ResultSet)dr).getTupleCount()==1) {
17161717
dr.next();
17171718
remarks =dr.getBytes(1);
1718-
}else
1719-
remarks =defaultRemarks;
1719+
}
17201720
dr.close();
17211721

17221722
StringrelKind;
@@ -1919,22 +1919,35 @@ public java.sql.ResultSet getColumns(String catalog, String schemaPattern, Strin
19191919
if (columnNamePattern ==null)columnNamePattern="%";
19201920

19211921
// Now form the query
1922-
// Modified by Stefan Andreasen <stefan@linux.kapow.dk>
1923-
r =connection.ExecSQL("select a.oid,c.relname,a.attname,a.atttypid,a.attnum,a.attnotnull,a.attlen,a.atttypmod,d.adsrc from pg_class c,pg_attribute a,pg_attrdef d where a.attrelid=c.oid and c.relname like '"+tableNamePattern.toLowerCase()+"' and a.attname like '"+columnNamePattern.toLowerCase()+"' and a.attnum>0 and c.oid=d.adrelid and d.adnum=a.attnum order by c.relname,a.attnum");
1924-
1925-
byteremarks[];
1922+
Stringquery =
1923+
"select " +
1924+
(connection.haveMinimumServerVersion("7.2") ?"a.attrelid" :"a.oid") +
1925+
",c.relname,a.attname,a.atttypid," +
1926+
"a.attnum,a.attnotnull,a.attlen,a.atttypmod,d.adsrc from pg_class c," +
1927+
"pg_attribute a,pg_attrdef d where a.attrelid=c.oid and " +
1928+
"c.relname like '"+tableNamePattern.toLowerCase()+"' and " +
1929+
"a.attname like '"+columnNamePattern.toLowerCase()+"' and " +
1930+
"a.attnum>0 and c.oid=d.adrelid and d.adnum=a.attnum " +
1931+
"order by c.relname,a.attnum";
1932+
1933+
r =connection.ExecSQL(query);
19261934

19271935
while(r.next()) {
19281936
byte[][]tuple =newbyte[18][0];
19291937

19301938
// Fetch the description for the table (if any)
1931-
java.sql.ResultSetdr =connection.ExecSQL("select description from pg_description where objoid="+r.getInt(1));
1939+
StringgetDescriptionStatement =
1940+
connection.haveMinimumServerVersion("7.2") ?
1941+
"select col_description(" +r.getInt(1) +"," +r.getInt(5) +")" :
1942+
"select description from pg_description where objoid=" +r.getInt(1);
1943+
1944+
java.sql.ResultSetdr =connection.ExecSQL(getDescriptionStatement);
1945+
19321946
if(((org.postgresql.ResultSet)dr).getTupleCount()==1) {
19331947
dr.next();
19341948
tuple[11] =dr.getBytes(1);
19351949
}else
1936-
tuple[11] =defaultRemarks;
1937-
1950+
tuple[11] =null;
19381951
dr.close();
19391952

19401953
tuple[0] ="".getBytes();// Catalog name

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