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Re: PATCH to org/postgresql/jdbc2/DatabaseMetaData.java

From: Peter Mount <peter(at)retep(dot)org(dot)uk>
To: Ola Sundell <ola(at)miranda(dot)org>, pgsql-jdbc(at)postgresql(dot)org
Subject: Re: PATCH to org/postgresql/jdbc2/DatabaseMetaData.java
Date: 2001-03-01 20:04:36
Message-ID: 5.0.2.1.0.20010301200359.0221b880@mail.retep.org.uk (view raw or flat)
Thread:
Lists: pgsql-jdbc
I'll take a look at this patch shortly.

Sorry for the delay, work has been hectic this week so I'm about 4 days 
behind with emails.

Peter

At 17:22 25/02/01 -0500, Ola Sundell wrote:
>---
>postgresql-7.1beta4/src/interfaces/jdbc/org/postgresql/jdbc2/DatabaseMetaData.java
>Mon Jan 29 03:53:56 2001
>+++
>postgresql-7.1beta4-new/src/interfaces/jdbc/org/postgresql/jdbc2/DatabaseMetaData.java
>Sat Feb 17 10:22:38 2001
>@@ -1048,7 +1048,7 @@
>    /**
>     * Can statements remain open across commits?  They may, but
>     * this driver cannot guarentee that.  In further reflection.
>-   * we are talking a Statement object jere, so the answer is
>+   * we are talking a Statement object here, so the answer is
>     * yes, since the Statement is only a vehicle to ExecSQL()
>     *
>     * @return true if they always remain open; false otherwise
>@@ -2185,6 +2185,81 @@
>                                                       );
>    }
>
>+  private Vector importLoop(java.sql.ResultSet keyRelation) throws
>SQLException {
>+    String s,s2;
>+    String origTable=null, primTable=new String(""), schema;
>+    int i;
>+    Vector v;
>+
>+    s=keyRelation.getString(1);
>+    s2=s;
>+    System.out.println(s);
>+    v=new Vector();
>+    for (i=0;;i++) {
>+      s=s.substring(s.indexOf("\\000")+4);
>+      if (s.compareTo("")==0) {
>+       System.out.println();
>+       break;
>+      }
>+      s2=s.substring(0,s.indexOf("\\000"));
>+      switch (i) {
>+      case 0:
>+       origTable=s2;
>+       break;
>+      case 1:
>+       primTable=s2;
>+       break;
>+      case 2:
>+       schema=s2;
>+       break;
>+      default:
>+       v.add(s2);
>+      }
>+  }
>+
>+  java.sql.ResultSet rstmp=connection.ExecSQL("select * from
>"+origTable+" where 1=0");
>+  java.sql.ResultSetMetaData origCols=rstmp.getMetaData();
>+
>+  String stmp;
>+  Vector tuples=new Vector();
>+  byte tuple[][];
>+
>+  // the foreign keys are only on even positions in the Vector.
>+  for (i=0;i<v.size();i+=2) {
>+    stmp=(String)v.elementAt(i);
>+
>+    for (int j=1;j<=origCols.getColumnCount();j++) {
>+      if (stmp.compareTo(origCols.getColumnName(j))==0) {
>+       tuple=new byte[14][0];
>+
>+       for (int k=0;k<14;k++)
>+         tuple[k]=null;
>+
>+       //PKTABLE_NAME
>+       tuple[2]=primTable.getBytes();
>+       //PKTABLE_COLUMN
>+       stmp=(String)v.elementAt(i+1);
>+       tuple[3]=stmp.getBytes();
>+       //FKTABLE_NAME
>+       tuple[6]=origTable.getBytes();
>+       //FKCOLUMN_NAME
>+       tuple[7]=origCols.getColumnName(j).getBytes();
>+       //KEY_SEQ
>+       tuple[8]=Integer.toString(j).getBytes();
>+
>+       tuples.add(tuple);
>+
>+       System.out.println(origCols.getColumnName(j)+
>+       ": "+j+" -> "+primTable+": "+
>+       (String)v.elementAt(i+1));
>+       break;
>+      }
>+    }
>+  }
>+
>+  return tuples;
>+  }
>+
>    /**
>     * Get a description of the primary key columns that are
>     * referenced by a table's foreign key columns (the primary keys
>@@ -2238,8 +2313,39 @@
>     */
>    public java.sql.ResultSet getImportedKeys(String catalog, String
>schema, String table) throws SQLException
>    {
>-    // XXX-Not Implemented
>-    return null;
>+    // Added by Ola Sundell <ola(at)miranda(dot)org>
>+    // FIXME: error checking galore!
>+    java.sql.ResultSet rsret;
>+    Field f[]=new Field[14];
>+    byte tuple[][];
>+
>+    f[0]=new Field(connection, "PKTABLE_CAT", iVarcharOid, 32);
>+    f[1]=new Field(connection, "PKTABLE_SCHEM", iVarcharOid, 32);
>+    f[2]=new Field(connection, "PKTABLE_NAME", iVarcharOid, 32);
>+    f[3]=new Field(connection, "PKCOLUMN_NAME", iVarcharOid, 32);
>+    f[4]=new Field(connection, "FKTABLE_CAT", iVarcharOid, 32);
>+    f[5]=new Field(connection, "FKTABLE_SCHEM", iVarcharOid, 32);
>+    f[6]=new Field(connection, "FKTABLE_NAME", iVarcharOid, 32);
>+    f[7]=new Field(connection, "FKCOLUMN_NAME", iVarcharOid, 32);
>+    f[8]=new Field(connection, "KEY_SEQ", iInt2Oid, 2);
>+    f[9]=new Field(connection, "UPDATE_RULE", iInt2Oid, 2);
>+    f[10]=new Field(connection, "DELETE_RULE", iInt2Oid, 2);
>+    f[11]=new Field(connection, "FK_NAME", iVarcharOid, 32);
>+    f[12]=new Field(connection, "PK_NAME", iVarcharOid, 32);
>+    f[13]=new Field(connection, "DEFERRABILITY", iInt2Oid, 2);
>+
>+    java.sql.ResultSet rs=connection.ExecSQL("select t.tgargs "+
>+           "from pg_class as c, pg_trigger as t "+
>+           "where c.relname like '"+table+"' and
>c.relfilenode=t.tgrelid");
>+    Vector tuples=new Vector();
>+
>+    while (rs.next()) {
>+           tuples.addAll(importLoop(rs));
>+    }
>+
>+    rsret=new ResultSet(connection, f, tuples, "OK", 1);
>+
>+    return rsret;
>    }
>
>    /**


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