JDBC中调用Postgresql存储过程
package www.zjptcc.wxw.jdbctest.psql;
/*
*
CREATE FUNCTION sum_n_product(x int, y int, OUT sum int, OUT prod int) AS $$
BEGIN
sum := x + y;
prod := x * y;
END;
$$ LANGUAGE plpgsql;
或
CREATE OR REPLACE FUNCTION sum_n_product (x int, y int, OUT sum int, OUT prod int) AS $$
SELECT $1 + $2, $1 * $2
$$ LANGUAGE SQL;
*
* */
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Types;
public class TestPsqlSp1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO 自动生成的方法存根
try {
Class.forName("org.postgresql.Driver").newInstance();
String url = "jdbc:postgresql://127.0.0.1:5432/you_db";// 数据库名
Connection conn = DriverManager.getConnection(url, "you_user","you_passwd");
/* sum_n_product(x int, y int, OUT sum int, OUT prod int) 是将输入参数x,y
* 的和放入第三个参数sum（输出参数），x,y的积放入第四个参数prod（输出参数）
* */
String procedure = "{ call sum_n_product(?, ?, ?, ?)}";
CallableStatement statement = conn.prepareCall(procedure);
//通过 setXXX 方法将值传给IN参数
statement.setInt(1, 3);
statement.setInt(2, 8);
//registerOutParameter注册输出参数sum,prod，输出参数的索引值是3,4
//参数的索引值是根据占位符?出现的次序从左到右由1开始计，不管其是输入还是输出参数
statement.registerOutParameter(3,Types.INTEGER);
statement.registerOutParameter(4,Types.INTEGER);
statement.execute();
//打印输出参数sum的值
System.out.println("sum="+statement.getInt(3));
System.out.println("product="+statement.getInt(4));
conn.close();
} catch (SQLException sqe) {
System.out.println("Unexpected exception : " + sqe.toString()
+ ", sqlstate = " + sqe.getSQLState());
System.exit(1);
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
运行结果：
sum=11
product=24
例子二
package www.zjptcc.wxw.jdbctest.psql;
/*
create table t123(id int primary key, col2 varchar(32) not null);
insert into t123 values(1, 'iihero');
insert into t123 values(2, 'Sybase');
insert into t123 values(3, 'ASE');
CREATE OR REPLACE FUNCTION test_proc (int, OUT num_t123 int) AS $$
DECLARE
id_min ALIAS FOR $1;
BEGIN
select count( a.id ) into num_t123 from t123 a where a.id >= id_min;
END
$$ LANGUAGE plpgsql;
mymotif=> select test_proc(1);
mymotif=> drop FUNCTION test_proc(int, OUT num_t123 int);
*
* */
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Types;
public class TestPsqlSp2 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO 自动生成的方法存根
try {
Class.forName("org.postgresql.Driver").newInstance();
String url = "jdbc:postgresql://127.0.0.1:5432/you_db";// 数据库名
Connection conn = DriverManager.getConnection(url, "you_user","you_passwd");
/* test_proc(@id_min int, @num_t123 int output))是将表t123中的id字段中大于等于第一个参数@id_min
的数目统计好，放到第二个参数@num_t123（输出参数） */
String procedure = "{ call test_proc(?, ?)}";
CallableStatement statement = conn.prepareCall(procedure);
//通过 setXXX 方法将IN参数传给@id_min，其中第一个1是参数的索引值，第二个1是传给@id_min的值
statement.setInt(1, 1);
//registerOutParameter注册输出参数@num_t123，输出参数的索引值是2
//参数的索引值是根据占位符?出现的次序从左到右由1开始计，不管其是输入还是输出参数
statement.registerOutParameter(2,Types.INTEGER);
statement.execute();
//打印输出参数@num_t123的值
System.out.print(statement.getInt(2));
conn.close();
} catch (SQLException sqe) {
System.out.println("Unexpected exception : " + sqe.toString()
+ ", sqlstate = " + sqe.getSQLState());
System.exit(1);
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
例子三
package www.zjptcc.wxw.jdbctest.psql;
/*
*
CREATE TABLE STUDENT (sno int, sname varchar(32));
insert into STUDENT values(1, '王海滨');
insert into STUDENT values(2, '李寻欢 ');
insert into STUDENT values(3, '张铁头');
CREATE OR REPLACE FUNCTION sp_stu_sel() RETURNS refcursor AS $$
declare
ref refcursor;
BEGIN
open ref for select * from STUDENT;
return ref;
END;
$$ LANGUAGE plpgsql;
*
* */
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
public class TestPsqlSpStu {
/**
* @param args
*/
public static void main(String[] args) {
// TODO 自动生成的方法存根
try {
Class.forName("org.postgresql.Driver").newInstance();
String url = "jdbc:postgresql://127.0.0.1:5432/you_db";// 数据库名
Connection conn = DriverManager.getConnection(url, "you_name",
"you_passwd");
conn.setAutoCommit(false); // return refcursor must within a transaction
String procedure = "{ ? = call sp_stu_sel()}";
CallableStatement statement = conn.prepareCall(procedure);
// 参数的索引值是根据占位符?出现的次序从左到右由1开始计，不管其是输入还是输出参数
statement.registerOutParameter(1, Types.OTHER);
statement.execute();
ResultSet result = (ResultSet) statement.getObject(1);
System.out.println(result);
while (result.next()) {
System.err.println("Name : " + result.getString("sname")); //getString(2)
}
conn.commit();
// 打印输出返回值
conn.close();
} catch (SQLException sqe) {
System.out.println("Unexpected exception : " + sqe.toString()
+ ", sqlstate = " + sqe.getSQLState());
System.exit(1);
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
运行结果：
org.postgresql.jdbc4.Jdbc4ResultSet@c31d6f2
Name : 王海滨
Name : 李寻欢
Name : 张铁头