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

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Ola Sundell <ola(at)miranda(dot)org>, Peter Mount <peter(at)retep(dot)org(dot)uk>
Cc: pgsql-jdbc(at)postgresql(dot)org
Subject: Re: PATCH to org/postgresql/jdbc2/DatabaseMetaData.java
Date: 2001-03-20 05:30:06
Message-ID: 200103200530.AAA28235@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-jdbc
Peter, can you comment on this?


> ---
> 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;
>    }
>  
>    /**
> 
> 
> 


-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

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