本文執行個體講述了java調用mysql預存程序的方法。分享給大家供大家參考。具體如下:
資料庫的測試代碼如下 :
1、建立表test
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create table test( field1 int not null ) TYPE=MyISAM ; insert into test(field1) values(1); |
2、刪除已存在的預存程序:
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-- 刪除儲存過程 delimiter // -- 定義結束符號 drop procedure p_test; |
3、mysql預存程序定義:
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create procedure p_test() begin declare temp int; set temp = 0; update test set field1 = values(temp); end |
4、調用方法:
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CallableStatement cStmt = conn.prepareCall("{call p_test()}"); cStmt.executeUpdate(); import java.sql.*; /** iGoder */ public class ProcedureTest { /* 表和預存程序定義如下: delimiter // DROP TABLE if exists test // CREATE TABLE test( id int(11) NULL ) // drop procedure if existssp1 // create procedure sp1(in p int) comment 'insert into a int value' begin declare v1 int; set v1 = p; insert into test(id) values(v1); end // drop procedure if exists sp2 // create procedure sp2(out p int) begin select max(id) into p from test; end // drop procedure if exists sp6 // create procedure sp6() begin select * from test; end// */ public static void main(String[] args) { //callIn(111); //callOut(); callResult(); } /** * 調用帶有輸入參數的預存程序 * @param in stored procedure input parametervalue */ public static void callIn(int in){ //擷取串連 Connection conn = ConnectDb.getConnection(); CallableStatement cs = null; try { //可以直接傳入參數 //cs = conn.prepareCall("{call sp1(1)}"); //也可以用問號代替 cs = conn.prepareCall("{call sp1(?)}"); //設定第一個輸入參數的值為110 cs.setInt(1, in); cs.execute(); } catch (Exception e) { e.printStackTrace(); } finally { try { if(cs != null){ cs.close(); } if(conn != null){ conn.close(); } } catch (Exception ex) { ex.printStackTrace(); } } } /** * 調用帶有輸出參數的預存程序 * */ public static void callOut() { Connection conn = ConnectDb.getConnection(); CallableStatement cs = null; try { cs = conn.prepareCall("{call sp2(?)}"); //第一個參數的類型為Int cs.registerOutParameter(1, Types.INTEGER); cs.execute(); //得到第一個值 int i = cs.getInt(1); System.out.println(i); } catch (Exception e) { e.printStackTrace(); } finally { try { if(cs != null){ cs.close(); } if(conn != null){ conn.close(); } } catch (Exception ex) { ex.printStackTrace(); } } } /** * 調用輸出結果集的預存程序 */ public static void callResult(){ Connection conn = ConnectDb.getConnection(); CallableStatement cs = null; ResultSet rs = null; try { cs = conn.prepareCall("{call sp6()}"); rs = cs.executeQuery(); //迴圈輸出結果 while(rs.next()){ System.out.println(rs.getString(1)); } } catch (Exception e) { e.printStackTrace(); } finally { try { if(rs != null){ rs.close(); } if(cs != null){ cs.close(); } if(conn != null){ conn.close(); } } catch (Exception ex) { ex.printStackTrace(); } } } } /** *擷取資料庫連接的類 */ import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; class ConnectDb { public static Connection getConnection(){ Connection conn = null; PreparedStatement preparedstatement = null; try { Class.forName("org.gjt.mm.mysql.Driver").newInstance(); String dbname = "test"; String url="jdbc:mysql://localhost/"+dbname+"?user=root&password=root&useUnicode=true&characterEncoding=8859_1"; conn= DriverManager.getConnection(url); } catch (Exception e) { e.printStackTrace(); } return conn; } } |
希望本文所述對大家的java程式設計有所協助。