POSTGRESQL的JDBC中的存储过程

1. 从www.postgresql.org下载最新的postgresql-snapshot.tar.gz, ant from apache;
2. setting ANT_HOME
3. ../configure --with-java; make; make install

FUNCTION 和 JAVA 代码参考了jdbc.postgresql.org mailing list里面的内容.

CREATE TABLE users (id int, name varchar(32));

CREATE OR REPLACE FUNCTION sp_users_select () RETURNS refcursor
AS '
declare ref refcursor;
begin
open ref for select * from users;
return ref;
end;
' LANGUAGE plpgsql;

import java.lang.*;
import java.sql.*;

public class pc
{
public static void main(String[] args)
throws Exception
{
String driver = "org.postgresql.Driver";
String url = "jdbc:postgresql://localhost:5432/nop";
String user = "nop";
String passwd = "nop";

Class.forName(driver);
Connection conn = DriverManager.getConnection(url, user, passwd);

conn.setAutoCommit(false); // return refcursor must within a transaction

CallableStatement proc = conn.prepareCall("{ ? = call sp_users_select () }");
proc.registerOutParameter(1, Types.OTHER);
proc.execute();

ResultSet result = (ResultSet) proc.getObject(1);
System.out.println(result);

while(result.next())
{
System.err.println("Name : " + result.getString(2));
}

conn.commit();
}
}

夜猫子 回复于：2003-07-17 01:02:05

java我是一窍不通的，不好意思。

joint 回复于：2003-07-17 09:44:32

我这么命苦啊？ :cry: :cry: :cry: :cry: :cry:

夜猫子 回复于：2003-07-17 10:37:12

你命好，大家嚼烂了的东西，有什么意思，大家都不懂，你搞定了才有意思。

joint 回复于：2003-07-19 12:44:20

猫子,我解决了,哈哈,HAPPY,最新的驱动解决了CallableStatement,先做了个return refcursor测试,其他的可以从JDBC代码的test里面参考,稍后做UPDATE, DELETE,INSERT测试

joint 回复于：2003-07-19 14:01:24

就写这么多了,JAVA程序最后还有个invalid message length的问题,没找到是在哪里,想到了再说吧

--
-- PostgreSQL database dump
--

/connect - postgres

SET search_path = public, pg_catalog;

--
-- TOC entry 7 (OID 17142)
-- Name: plpgsql_call_handler (); Type: FUNC PROCEDURAL LANGUAGE; Schema: public; Owner: postgres
--

CREATE FUNCTION plpgsql_call_handler () RETURNS language_handler
AS '$libdir/plpgsql', 'plpgsql_call_handler'
LANGUAGE c;

--
-- TOC entry 6 (OID 17143)
-- Name: plpgsql; Type: PROCEDURAL LANGUAGE; Schema: public; Owner:
--

CREATE TRUSTED PROCEDURAL LANGUAGE plpgsql HANDLER plpgsql_call_handler;

--
-- TOC entry 2 (OID 2200)
-- Name: public; Type: ACL; Schema: -; Owner: postgres
--

REVOKE ALL ON SCHEMA public FROM PUBLIC;
GRANT ALL ON SCHEMA public TO PUBLIC;

--
-- TOC entry 3 (OID 17140)
-- Name: users; Type: TABLE; Schema: public; Owner: postgres
--

CREATE TABLE users (
id integer NOT NULL,
name character varying(32)
);

--
-- TOC entry 4 (OID 17140)
-- Name: users; Type: ACL; Schema: public; Owner: postgres
--

REVOKE ALL ON TABLE users FROM PUBLIC;
GRANT INSERT,SELECT,UPDATE,DELETE ON TABLE users TO nop;

--
-- TOC entry 8 (OID 17144)
-- Name: sp_users_select (); Type: FUNCTION; Schema: public; Owner: postgres
--

CREATE FUNCTION sp_users_select () RETURNS refcursor
AS '
declare ref refcursor;
begin
open ref for select * from users;
return ref;
end;
'
LANGUAGE plpgsql;

--
-- TOC entry 9 (OID 17149)
-- Name: sp_users_insert (integer, character varying); Type: FUNCTION; Schema: public; Owner: postgres
--

CREATE FUNCTION sp_users_insert (integer, character varying) RETURNS integer
AS '
declare v_id alias for $1;
v_name alias for $2;
v_return int;
begin
insert into users values (v_id, v_name);
get diagnostics v_return = ROW_COUNT;
return v_return;
end;'
LANGUAGE plpgsql;

--
-- TOC entry 10 (OID 17156)
-- Name: sp_users_delete (integer); Type: FUNCTION; Schema: public; Owner: postgres
--

CREATE FUNCTION sp_users_delete (integer) RETURNS integer
AS '
declare v_id alias for $1;
v_return int;
begin
delete from users where id = v_id;
get diagnostics v_return = ROW_COUNT;
return v_return;
end;'
LANGUAGE plpgsql;

--
-- TOC entry 5 (OID 17147)
-- Name: users_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres
--

ALTER TABLE ONLY users
ADD CONSTRAINT users_pkey PRIMARY KEY (id);

////////////////////////////////////
import java.lang.*;
import java.sql.*;

public class pc
{
public static void main(String[] args)
throws Exception
{
String driver = "org.postgresql.Driver";
String url = "jdbc:postgresql://localhost:5432/nop";
String user = "nop";
String passwd = "nop";

Class.forName(driver);
Connection conn = DriverManager.getConnection(url, user, passwd);

// conn.setAutoCommit(false);

// Insert
CallableStatement callInsert = conn.prepareCall("{ ? = call sp_users_insert(?, ?) }");
callInsert.registerOutParameter(1, Types.INTEGER);
callInsert.setInt(2, 6);
callInsert.setString(3, "ARRR");
callInsert.execute();

// Select
conn.setAutoCommit(false);
CallableStatement callSelect = conn.prepareCall("{ ? = call sp_users_select () }");
callSelect.registerOutParameter(1, Types.OTHER);
callSelect.execute();

ResultSet rs = (ResultSet) callSelect.getObject(1);
System.out.println(rs);

while(rs.next())
{
System.err.println("Id : " + rs.getInt(1) + " Name : " + rs.getString(2));
}

conn.commit();

// Delete
conn.setAutoCommit(false);
CallableStatement callDelete = conn.prepareCall("{ ? = call sp_users_delete (?) }");
callDelete.registerOutParameter(1, Types.INTEGER);
callDelete.setInt(2, 6);
callDelete.execute();
conn.commit();

if(callInsert != null)
callInsert.close();
if(callSelect != null)
callSelect.close();
if(callDelete != null)
callDelete.close();
if(rs != null)
rs.close();
if(conn != null)
conn.close();
}
}

joint 回复于：2003-07-29 22:04:10

已经有这么多人看了啊,呵呵,希望对有所帮助

netkiller 回复于：2003-10-07 15:14:19

用不着那么麻烦。我一直都是这么用。

CREATE FUNCTION reffunc(refcursor) RETURNS refcursor AS '

BEGIN

OPEN $1 FOR SELECT * FROM system_log;

RETURN $1;

END;

' LANGUAGE 'plpgsql';

BEGIN;

SELECT reffunc('funccursor');

FETCH ALL IN funccursor;

COMMIT;

public void Cursors(){

String sql 			= "SELECT reffunc('funccursor')";

String sql2			= "FETCH ALL IN funccursor";

DBConnect odb = null;

try{

odb = new DBConnect(oDatabase);

odb.Begin();

odb.prepareStatement(sql);

rs = odb.executeQuery();

odb.prepareStatement(sql2);

//odb.setString(1,user);

rs = odb.executeQuery();

if(rs!=null) {

while(rs.next()){

System.out.print(rs.getString(1)+"|");

System.out.print(rs.getString(2)+"|");

System.out.print(rs.getString(3)+"|");

System.out.println(rs.getString(4));

}

}

odb.Commit();

}

catch(Exception e){

e.printStackTrace();

}

finally{

try{

odb.close();

}catch(Exception e){

e.printStackTrace();

}

}

}

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