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Per the recent discussion there's been some code changes in JDBC's
DatabaseMetaData.getColumn(). I proposed a patch that would change the number of queries to find out all columns in a table from 2 * N + 1 to 1 (N being the number of columns reported) by using some outer joins. I also fixed the fact that getColumns() only returned columns that had a default defined. OTOH, I did not use to change the code required for obtaining a column's remarks (by using col_description() for 7.2 and requested by Tom Lane). Finally, I have found a way to get all the column details in a single query *and* use col_description() for 7.2 servers. A patch is attached. It overrules Ren? Pijlman's fix for this that was committed just today, but still used N + 1 queries (sorry Ren? ;-) ) I also fixed the return values for TABLE_CAT and TABLE_SCHEM from "" to null, to be more standard compliant (and requested in Ren?'s mail found at http://fts.postgresql.org/db/mw/msg.html?mid=1034253). As always, the JDBC1 version has not been tested as I have no JDK 1.1 Jeroen van Vianen
This commit is contained in:
Bruce Momjian
parent
5b328502b5
commit
07ce9fe61d
@ -13,7 +13,7 @@ import org.postgresql.util.PSQLException;
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/**
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* This class provides information about the database as a whole.
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*
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* $Id: DatabaseMetaData.java,v 1.32 2001/09/10 14:55:08 momjian Exp $
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* $Id: DatabaseMetaData.java,v 1.33 2001/09/29 03:08:01 momjian Exp $
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*
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* <p>Many of the methods here return lists of information in ResultSets. You
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* can use the normal ResultSet methods such as getString and getInt to
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@ -1895,21 +1895,19 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
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*/
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public java.sql.ResultSet getColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern) throws SQLException
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{
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// the field descriptors for the new ResultSet
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Field f[] = new Field[18];
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java.sql.ResultSet r; // ResultSet for the SQL query that we need to do
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Vector v = new Vector(); // The new ResultSet tuple stuff
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Field f[] = new Field[18]; // The field descriptors for the new ResultSet
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f[0] = new Field(connection, "TABLE_CAT", iVarcharOid, 32);
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f[1] = new Field(connection, "TABLE_SCHEM", iVarcharOid, 32);
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f[2] = new Field(connection, "TABLE_NAME", iVarcharOid, 32);
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f[3] = new Field(connection, "COLUMN_NAME", iVarcharOid, 32);
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f[4] = new Field(connection, "DATA_TYPE", iInt2Oid, 2);
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f[5] = new Field(connection, "TYPE_NAME", iVarcharOid, 32);
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f[6] = new Field(connection, "COLUMN_SIZE", iInt4Oid, 4);
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f[7] = new Field(connection, "BUFFER_LENGTH", iVarcharOid, 32);
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f[8] = new Field(connection, "DECIMAL_DIGITS", iInt4Oid, 4);
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f[9] = new Field(connection, "NUM_PREC_RADIX", iInt4Oid, 4);
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f[0] = new Field(connection, "TABLE_CAT", iVarcharOid, 32);
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f[1] = new Field(connection, "TABLE_SCHEM", iVarcharOid, 32);
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f[2] = new Field(connection, "TABLE_NAME", iVarcharOid, 32);
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f[3] = new Field(connection, "COLUMN_NAME", iVarcharOid, 32);
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f[4] = new Field(connection, "DATA_TYPE", iInt2Oid, 2);
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f[5] = new Field(connection, "TYPE_NAME", iVarcharOid, 32);
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f[6] = new Field(connection, "COLUMN_SIZE", iInt4Oid, 4);
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f[7] = new Field(connection, "BUFFER_LENGTH", iVarcharOid, 32);
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f[8] = new Field(connection, "DECIMAL_DIGITS", iInt4Oid, 4);
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f[9] = new Field(connection, "NUM_PREC_RADIX", iInt4Oid, 4);
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f[10] = new Field(connection, "NULLABLE", iInt4Oid, 4);
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f[11] = new Field(connection, "REMARKS", iVarcharOid, 32);
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f[12] = new Field(connection, "COLUMN_DEF", iVarcharOid, 32);
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@ -1919,93 +1917,105 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
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f[16] = new Field(connection, "ORDINAL_POSITION", iInt4Oid,4);
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f[17] = new Field(connection, "IS_NULLABLE", iVarcharOid, 32);
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// Added by Stefan Andreasen <stefan@linux.kapow.dk>
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// If the pattern are null then set them to %
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if (tableNamePattern == null) tableNamePattern="%";
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if (columnNamePattern == null) columnNamePattern="%";
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StringBuffer sql = new StringBuffer(512);
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// Now form the query
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String query =
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"select " +
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(connection.haveMinimumServerVersion("7.2") ? "a.attrelid" : "a.oid") +
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",c.relname,a.attname,a.atttypid," +
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"a.attnum,a.attnotnull,a.attlen,a.atttypmod,d.adsrc " +
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"from (pg_class c inner join pg_attribute a " +
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"on (c.oid=a.attrelid) ) " +
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"left outer join pg_attrdef d " +
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"on (c.oid=d.adrelid and d.adnum=a.attnum) " +
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"where " +
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"c.relname like '"+tableNamePattern.toLowerCase()+"' and " +
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"a.attname like '"+columnNamePattern.toLowerCase()+"' and " +
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"a.attnum>0 " +
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"order by c.relname,a.attnum";
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/* Build a >= 7.1 SQL statement to list all columns */
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sql.append("select " +
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(connection.haveMinimumServerVersion("7.2") ? "a.attrelid, " : "a.oid, ") +
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" c.relname, " +
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" a.attname, " +
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" a.atttypid, " +
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" a.attnum, " +
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" a.attnotnull, " +
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" a.attlen, " +
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" a.atttypmod, " +
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" d.adsrc, " +
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" t.typname, " +
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/* Use the new col_description in 7.2 or an additional outer join in 7.1 */
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(connection.haveMinimumServerVersion("7.2") ? "col_description(a.attrelid, a.attnum) " : "e.description ") +
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"from" +
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" (" +
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" (pg_class c inner join pg_attribute a on" +
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" (" +
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" a.attrelid=c.oid");
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r = connection.ExecSQL(query);
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if ((tableNamePattern != null) && ! tableNamePattern.equals("%")) {
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sql.append(" and c.relname like \'" + tableNamePattern + "\'");
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}
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while(r.next()) {
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byte[][] tuple = new byte[18][0];
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if ((columnNamePattern != null) && ! columnNamePattern.equals("%")) {
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sql.append(" and a.attname like \'" + columnNamePattern + "\'");
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}
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// Fetch the description for the table (if any)
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String getDescriptionStatement =
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connection.haveMinimumServerVersion("7.2") ?
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"select col_description(" + r.getInt(1) + "," + r.getInt(5) + ")" :
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"select description from pg_description where objoid=" + r.getInt(1);
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sql.append(
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" and a.attnum > 0" +
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" )" +
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" ) inner join pg_type t on" +
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" (" +
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" t.oid = a.atttypid" +
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" )" +
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" )" +
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" left outer join pg_attrdef d on" +
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" (" +
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" c.oid = d.adrelid" +
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" and a.attnum = d.adnum" +
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" ) ");
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java.sql.ResultSet dr = connection.ExecSQL(getDescriptionStatement);
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if (!connection.haveMinimumServerVersion("7.2")) {
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/* Only for 7.1 */
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sql.append(
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" left outer join pg_description e on" +
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" (" +
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" e.objoid = a.oid" +
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" ) ");
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}
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if(((org.postgresql.ResultSet)dr).getTupleCount()==1) {
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dr.next();
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tuple[11] = dr.getBytes(1);
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} else
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tuple[11] = null;
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dr.close();
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sql.append("order by" +
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" c.relname, a.attnum");
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tuple[0] = "".getBytes(); // Catalog name
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tuple[1] = "".getBytes(); // Schema name
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tuple[2] = r.getBytes(2); // Table name
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tuple[3] = r.getBytes(3); // Column name
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java.sql.ResultSet r = connection.ExecSQL(sql.toString());
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while (r.next()) {
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byte[][] tuple = new byte[18][0];
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dr = connection.ExecSQL("select typname from pg_type where oid = "+r.getString(4));
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dr.next();
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String typname=dr.getString(1);
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dr.close();
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tuple[4] = Integer.toString(connection.getSQLType(typname)).getBytes(); // Data type
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tuple[5] = typname.getBytes(); // Type name
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String nullFlag = r.getString(6);
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String typname = r.getString(10);
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// Column size
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// Looking at the psql source,
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// I think the length of a varchar as specified when the table was created
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// should be extracted from atttypmod which contains this length + sizeof(int32)
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if (typname.equals("bpchar") || typname.equals("varchar")) {
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int atttypmod = r.getInt(8);
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tuple[6] = Integer.toString(atttypmod != -1 ? atttypmod - VARHDRSZ : 0).getBytes();
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} else
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tuple[6] = r.getBytes(7);
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tuple[0] = null; // Catalog name, not supported
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tuple[1] = null; // Schema name, not supported
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tuple[2] = r.getBytes(2); // Table name
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tuple[3] = r.getBytes(3); // Column name
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tuple[4] = Integer.toString(connection.getSQLType(typname)).getBytes(); // Data type
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tuple[5] = typname.getBytes(); // Type name
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tuple[7] = null; // Buffer length
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// Column size
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// Looking at the psql source,
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// I think the length of a varchar as specified when the table was created
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// should be extracted from atttypmod which contains this length + sizeof(int32)
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if (typname.equals("bpchar") || typname.equals("varchar")) {
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int atttypmod = r.getInt(8);
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tuple[6] = Integer.toString(atttypmod != -1 ? atttypmod - VARHDRSZ : 0).getBytes();
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} else {
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tuple[6] = r.getBytes(7);
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}
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tuple[8] = "0".getBytes(); // Decimal Digits - how to get this?
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tuple[9] = "10".getBytes(); // Num Prec Radix - assume decimal
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tuple[7] = null; // Buffer length
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tuple[8] = "0".getBytes(); // Decimal Digits - how to get this?
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tuple[9] = "10".getBytes(); // Num Prec Radix - assume decimal
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tuple[10] = Integer.toString(nullFlag.equals("f") ?
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java.sql.DatabaseMetaData.columnNullable :
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java.sql.DatabaseMetaData.columnNoNulls).getBytes(); // Nullable
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tuple[11] = r.getBytes(11); // Description (if any)
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tuple[12] = r.getBytes(9); // Column default
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tuple[13] = null; // sql data type (unused)
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tuple[14] = null; // sql datetime sub (unused)
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tuple[15] = tuple[6]; // char octet length
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tuple[16] = r.getBytes(5); // ordinal position
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tuple[17] = (nullFlag.equals("f") ? "YES" : "NO").getBytes(); // Is nullable
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// tuple[10] is below
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// tuple[11] is above
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v.addElement(tuple);
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}
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r.close();
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tuple[12] = r.getBytes(9); // column default
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tuple[13] = null; // sql data type (unused)
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tuple[14] = null; // sql datetime sub (unused)
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tuple[15] = tuple[6]; // char octet length
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tuple[16] = r.getBytes(5); // ordinal position
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String nullFlag = r.getString(6);
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tuple[10] = Integer.toString(nullFlag.equals("f")?java.sql.DatabaseMetaData.columnNullable:java.sql.DatabaseMetaData.columnNoNulls).getBytes(); // Nullable
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tuple[17] = (nullFlag.equals("f")?"YES":"NO").getBytes(); // is nullable
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v.addElement(tuple);
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}
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r.close();
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return new ResultSet(connection, f, v, "OK", 1);
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}
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@ -13,7 +13,7 @@ import org.postgresql.util.PSQLException;
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/**
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* This class provides information about the database as a whole.
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*
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* $Id: DatabaseMetaData.java,v 1.36 2001/09/10 14:55:08 momjian Exp $
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* $Id: DatabaseMetaData.java,v 1.37 2001/09/29 03:08:01 momjian Exp $
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*
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* <p>Many of the methods here return lists of information in ResultSets. You
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* can use the normal ResultSet methods such as getString and getInt to
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@ -1895,21 +1895,19 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
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*/
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public java.sql.ResultSet getColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern) throws SQLException
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{
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// the field descriptors for the new ResultSet
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Field f[] = new Field[18];
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java.sql.ResultSet r; // ResultSet for the SQL query that we need to do
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Vector v = new Vector(); // The new ResultSet tuple stuff
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Field f[] = new Field[18]; // The field descriptors for the new ResultSet
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f[0] = new Field(connection, "TABLE_CAT", iVarcharOid, 32);
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f[1] = new Field(connection, "TABLE_SCHEM", iVarcharOid, 32);
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f[2] = new Field(connection, "TABLE_NAME", iVarcharOid, 32);
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f[3] = new Field(connection, "COLUMN_NAME", iVarcharOid, 32);
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f[4] = new Field(connection, "DATA_TYPE", iInt2Oid, 2);
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f[5] = new Field(connection, "TYPE_NAME", iVarcharOid, 32);
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f[6] = new Field(connection, "COLUMN_SIZE", iInt4Oid, 4);
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f[7] = new Field(connection, "BUFFER_LENGTH", iVarcharOid, 32);
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f[8] = new Field(connection, "DECIMAL_DIGITS", iInt4Oid, 4);
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f[9] = new Field(connection, "NUM_PREC_RADIX", iInt4Oid, 4);
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f[0] = new Field(connection, "TABLE_CAT", iVarcharOid, 32);
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f[1] = new Field(connection, "TABLE_SCHEM", iVarcharOid, 32);
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f[2] = new Field(connection, "TABLE_NAME", iVarcharOid, 32);
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f[3] = new Field(connection, "COLUMN_NAME", iVarcharOid, 32);
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f[4] = new Field(connection, "DATA_TYPE", iInt2Oid, 2);
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f[5] = new Field(connection, "TYPE_NAME", iVarcharOid, 32);
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f[6] = new Field(connection, "COLUMN_SIZE", iInt4Oid, 4);
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f[7] = new Field(connection, "BUFFER_LENGTH", iVarcharOid, 32);
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f[8] = new Field(connection, "DECIMAL_DIGITS", iInt4Oid, 4);
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f[9] = new Field(connection, "NUM_PREC_RADIX", iInt4Oid, 4);
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f[10] = new Field(connection, "NULLABLE", iInt4Oid, 4);
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f[11] = new Field(connection, "REMARKS", iVarcharOid, 32);
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f[12] = new Field(connection, "COLUMN_DEF", iVarcharOid, 32);
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@ -1919,93 +1917,105 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
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f[16] = new Field(connection, "ORDINAL_POSITION", iInt4Oid,4);
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f[17] = new Field(connection, "IS_NULLABLE", iVarcharOid, 32);
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// Added by Stefan Andreasen <stefan@linux.kapow.dk>
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// If the pattern are null then set them to %
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if (tableNamePattern == null) tableNamePattern="%";
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if (columnNamePattern == null) columnNamePattern="%";
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StringBuffer sql = new StringBuffer(512);
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// Now form the query
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String query =
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"select " +
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(connection.haveMinimumServerVersion("7.2") ? "a.attrelid" : "a.oid") +
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",c.relname,a.attname,a.atttypid," +
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"a.attnum,a.attnotnull,a.attlen,a.atttypmod,d.adsrc " +
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"from (pg_class c inner join pg_attribute a " +
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"on (c.oid=a.attrelid) ) " +
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"left outer join pg_attrdef d " +
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"on (c.oid=d.adrelid and d.adnum=a.attnum) " +
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"where " +
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"c.relname like '"+tableNamePattern.toLowerCase()+"' and " +
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"a.attname like '"+columnNamePattern.toLowerCase()+"' and " +
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"a.attnum>0 " +
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"order by c.relname,a.attnum";
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/* Build a >= 7.1 SQL statement to list all columns */
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sql.append("select " +
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(connection.haveMinimumServerVersion("7.2") ? "a.attrelid, " : "a.oid, ") +
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" c.relname, " +
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" a.attname, " +
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" a.atttypid, " +
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" a.attnum, " +
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" a.attnotnull, " +
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" a.attlen, " +
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" a.atttypmod, " +
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" d.adsrc, " +
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" t.typname, " +
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/* Use the new col_description in 7.2 or an additional outer join in 7.1 */
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(connection.haveMinimumServerVersion("7.2") ? "col_description(a.attrelid, a.attnum) " : "e.description ") +
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"from" +
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" (" +
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" (pg_class c inner join pg_attribute a on" +
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" (" +
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" a.attrelid=c.oid");
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r = connection.ExecSQL(query);
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if ((tableNamePattern != null) && ! tableNamePattern.equals("%")) {
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sql.append(" and c.relname like \'" + tableNamePattern + "\'");
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}
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while(r.next()) {
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byte[][] tuple = new byte[18][0];
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if ((columnNamePattern != null) && ! columnNamePattern.equals("%")) {
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sql.append(" and a.attname like \'" + columnNamePattern + "\'");
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}
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// Fetch the description for the table (if any)
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String getDescriptionStatement =
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connection.haveMinimumServerVersion("7.2") ?
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"select col_description(" + r.getInt(1) + "," + r.getInt(5) + ")" :
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"select description from pg_description where objoid=" + r.getInt(1);
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sql.append(
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" and a.attnum > 0" +
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" )" +
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" ) inner join pg_type t on" +
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" (" +
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" t.oid = a.atttypid" +
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" )" +
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" )" +
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" left outer join pg_attrdef d on" +
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" (" +
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" c.oid = d.adrelid" +
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" and a.attnum = d.adnum" +
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" ) ");
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java.sql.ResultSet dr = connection.ExecSQL(getDescriptionStatement);
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if (!connection.haveMinimumServerVersion("7.2")) {
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/* Only for 7.1 */
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sql.append(
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" left outer join pg_description e on" +
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" (" +
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" e.objoid = a.oid" +
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" ) ");
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}
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if(((org.postgresql.ResultSet)dr).getTupleCount()==1) {
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dr.next();
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tuple[11] = dr.getBytes(1);
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} else
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tuple[11] = null;
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dr.close();
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sql.append("order by" +
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" c.relname, a.attnum");
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|
||||
tuple[0] = "".getBytes(); // Catalog name
|
||||
tuple[1] = "".getBytes(); // Schema name
|
||||
tuple[2] = r.getBytes(2); // Table name
|
||||
tuple[3] = r.getBytes(3); // Column name
|
||||
java.sql.ResultSet r = connection.ExecSQL(sql.toString());
|
||||
while (r.next()) {
|
||||
byte[][] tuple = new byte[18][0];
|
||||
|
||||
dr = connection.ExecSQL("select typname from pg_type where oid = "+r.getString(4));
|
||||
dr.next();
|
||||
String typname=dr.getString(1);
|
||||
dr.close();
|
||||
tuple[4] = Integer.toString(connection.getSQLType(typname)).getBytes(); // Data type
|
||||
tuple[5] = typname.getBytes(); // Type name
|
||||
String nullFlag = r.getString(6);
|
||||
String typname = r.getString(10);
|
||||
|
||||
// Column size
|
||||
// Looking at the psql source,
|
||||
// I think the length of a varchar as specified when the table was created
|
||||
// should be extracted from atttypmod which contains this length + sizeof(int32)
|
||||
if (typname.equals("bpchar") || typname.equals("varchar")) {
|
||||
int atttypmod = r.getInt(8);
|
||||
tuple[6] = Integer.toString(atttypmod != -1 ? atttypmod - VARHDRSZ : 0).getBytes();
|
||||
} else
|
||||
tuple[6] = r.getBytes(7);
|
||||
tuple[0] = null; // Catalog name, not supported
|
||||
tuple[1] = null; // Schema name, not supported
|
||||
tuple[2] = r.getBytes(2); // Table name
|
||||
tuple[3] = r.getBytes(3); // Column name
|
||||
tuple[4] = Integer.toString(connection.getSQLType(typname)).getBytes(); // Data type
|
||||
tuple[5] = typname.getBytes(); // Type name
|
||||
|
||||
tuple[7] = null; // Buffer length
|
||||
// Column size
|
||||
// Looking at the psql source,
|
||||
// I think the length of a varchar as specified when the table was created
|
||||
// should be extracted from atttypmod which contains this length + sizeof(int32)
|
||||
if (typname.equals("bpchar") || typname.equals("varchar")) {
|
||||
int atttypmod = r.getInt(8);
|
||||
tuple[6] = Integer.toString(atttypmod != -1 ? atttypmod - VARHDRSZ : 0).getBytes();
|
||||
} else {
|
||||
tuple[6] = r.getBytes(7);
|
||||
}
|
||||
|
||||
tuple[8] = "0".getBytes(); // Decimal Digits - how to get this?
|
||||
tuple[9] = "10".getBytes(); // Num Prec Radix - assume decimal
|
||||
tuple[7] = null; // Buffer length
|
||||
tuple[8] = "0".getBytes(); // Decimal Digits - how to get this?
|
||||
tuple[9] = "10".getBytes(); // Num Prec Radix - assume decimal
|
||||
tuple[10] = Integer.toString(nullFlag.equals("f") ?
|
||||
java.sql.DatabaseMetaData.columnNullable :
|
||||
java.sql.DatabaseMetaData.columnNoNulls).getBytes(); // Nullable
|
||||
tuple[11] = r.getBytes(11); // Description (if any)
|
||||
tuple[12] = r.getBytes(9); // Column default
|
||||
tuple[13] = null; // sql data type (unused)
|
||||
tuple[14] = null; // sql datetime sub (unused)
|
||||
tuple[15] = tuple[6]; // char octet length
|
||||
tuple[16] = r.getBytes(5); // ordinal position
|
||||
tuple[17] = (nullFlag.equals("f") ? "YES" : "NO").getBytes(); // Is nullable
|
||||
|
||||
// tuple[10] is below
|
||||
// tuple[11] is above
|
||||
v.addElement(tuple);
|
||||
}
|
||||
r.close();
|
||||
|
||||
tuple[12] = r.getBytes(9); // column default
|
||||
|
||||
tuple[13] = null; // sql data type (unused)
|
||||
tuple[14] = null; // sql datetime sub (unused)
|
||||
|
||||
tuple[15] = tuple[6]; // char octet length
|
||||
|
||||
tuple[16] = r.getBytes(5); // ordinal position
|
||||
|
||||
String nullFlag = r.getString(6);
|
||||
tuple[10] = Integer.toString(nullFlag.equals("f")?java.sql.DatabaseMetaData.columnNullable:java.sql.DatabaseMetaData.columnNoNulls).getBytes(); // Nullable
|
||||
tuple[17] = (nullFlag.equals("f")?"YES":"NO").getBytes(); // is nullable
|
||||
|
||||
v.addElement(tuple);
|
||||
}
|
||||
r.close();
|
||||
return new ResultSet(connection, f, v, "OK", 1);
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user