| 1 |
750
|
harris
|
/**
|
| 2 |
|
|
* '$RCSfile$'
|
| 3 |
751
|
bojilova
|
* Purpose: A db adapter class for PostgreSQL RDBMS.
|
| 4 |
750
|
harris
|
* Copyright: 2000 Regents of the University of California and the
|
| 5 |
|
|
* National Center for Ecological Analysis and Synthesis
|
| 6 |
|
|
* Authors: Jivka Bojilova
|
| 7 |
|
|
* Release: @release@
|
| 8 |
|
|
*
|
| 9 |
|
|
* '$Author$'
|
| 10 |
|
|
* '$Date$'
|
| 11 |
|
|
* '$Revision$'
|
| 12 |
|
|
*
|
| 13 |
|
|
* This program is free software; you can redistribute it and/or modify
|
| 14 |
|
|
* it under the terms of the GNU General Public License as published by
|
| 15 |
|
|
* the Free Software Foundation; either version 2 of the License, or
|
| 16 |
|
|
* (at your option) any later version.
|
| 17 |
|
|
*
|
| 18 |
|
|
* This program is distributed in the hope that it will be useful,
|
| 19 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 20 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
| 21 |
|
|
* GNU General Public License for more details.
|
| 22 |
|
|
*
|
| 23 |
|
|
* You should have received a copy of the GNU General Public License
|
| 24 |
|
|
* along with this program; if not, write to the Free Software
|
| 25 |
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
| 26 |
|
|
*/
|
| 27 |
|
|
|
| 28 |
|
|
package edu.ucsb.nceas.dbadapter;
|
| 29 |
|
|
|
| 30 |
|
|
import java.sql.*;
|
| 31 |
|
|
|
| 32 |
|
|
/**
|
| 33 |
751
|
bojilova
|
* The PostgreSQL db adapter implementation.
|
| 34 |
750
|
harris
|
*/
|
| 35 |
|
|
public class DBPostgresql extends DBAdapter {
|
| 36 |
|
|
|
| 37 |
|
|
/**
|
| 38 |
751
|
bojilova
|
* The PostgreSQL unique ID /sequence generator
|
| 39 |
750
|
harris
|
* The name of the sequence used to generate the unique id
|
| 40 |
|
|
* is made from the name of the table that uses the id by
|
| 41 |
|
|
* appending "_id_seq" to it.
|
| 42 |
757
|
bojilova
|
* When record is inserted in the table and before insert trigger
|
| 43 |
|
|
* gets a nextval from that sequence, select currval of that
|
| 44 |
|
|
* sequence can return the generated key in the same db connection.
|
| 45 |
750
|
harris
|
*
|
| 46 |
757
|
bojilova
|
* @param conn db connection in which the unique id was generated
|
| 47 |
|
|
* @param tableName the name of table which unique id was generate
|
| 48 |
750
|
harris
|
* @exception SQLException any SQLException that can be thrown
|
| 49 |
|
|
* during the db operation
|
| 50 |
|
|
* @return return the generated unique id as a long type
|
| 51 |
|
|
*/
|
| 52 |
|
|
public long getUniqueID(Connection conn, String tableName)
|
| 53 |
|
|
throws SQLException {
|
| 54 |
|
|
long uniqueid = 0;
|
| 55 |
|
|
Statement stmt = conn.createStatement();
|
| 56 |
757
|
bojilova
|
stmt.execute("SELECT currval('" + tableName + "_id_seq')");
|
| 57 |
750
|
harris
|
ResultSet rs = stmt.getResultSet();
|
| 58 |
|
|
if ( rs.next() )
|
| 59 |
|
|
{
|
| 60 |
|
|
uniqueid = rs.getLong(1);
|
| 61 |
|
|
}
|
| 62 |
|
|
stmt.close();
|
| 63 |
|
|
//System.out.println("Unique ID: " + uniqueid);
|
| 64 |
|
|
return uniqueid;
|
| 65 |
|
|
}
|
| 66 |
|
|
|
| 67 |
|
|
/**
|
| 68 |
751
|
bojilova
|
* The PostgreSQL function name that gets the current date
|
| 69 |
|
|
* and time from the database server
|
| 70 |
750
|
harris
|
*
|
| 71 |
757
|
bojilova
|
* @return return the current date and time function name: "now()"
|
| 72 |
750
|
harris
|
*/
|
| 73 |
753
|
harris
|
public String getDateTimeFunction() {
|
| 74 |
750
|
harris
|
|
| 75 |
757
|
bojilova
|
//System.out.println("The date and time function: " + "now()");
|
| 76 |
|
|
//to return just the date use now()::date
|
| 77 |
|
|
//and for the time use now()::time
|
| 78 |
753
|
harris
|
return "now()";
|
| 79 |
750
|
harris
|
}
|
| 80 |
|
|
|
| 81 |
|
|
/**
|
| 82 |
751
|
bojilova
|
* PostgreSQL's string delimiter character: single quote (')
|
| 83 |
750
|
harris
|
*
|
| 84 |
|
|
* @return return the string delimiter: single quote (')
|
| 85 |
|
|
*/
|
| 86 |
|
|
public String getStringDelimiter() {
|
| 87 |
|
|
|
| 88 |
|
|
return "'";
|
| 89 |
|
|
}
|
| 90 |
|
|
|
| 91 |
|
|
}
|