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存储过程之七—java代码调用

一、简介

  jdbc调用存储过程与调用一般的sql语句有些差别。jdbc调用一般的sql语句的时候,返回的是结果集,或是sql语句后是否执行成功的标记量。而存储过程返回的可以是结果集,输出参数、返回状态和受影响行数。而mysql存储过程不支持return,所以只有剩下的三种返回方式。

  调用的过程一般如下:

  1、创建连接 Connection conn = DriverManager.getConnection(url, user, password);

  2、创建CallableStatement CallableStatement statement = conn.prepareCall(sql);

  3、设置参数

    statement.setInt(1, id);
    statement.registerOutParameter(2, Types.VARCHAR);
    statement.registerOutParameter(3, Types.INTEGER);
    statement.registerOutParameter(4, Types.VARCHAR);

   4、执行

    statement.execute(); 或 statement.executeUpdate();

  5、获取返回

    int age = statement.getInt(3);或ResultSet resultSet = statement.executeQuery();

二、实例

  以下存储过程表结构如下:

DROP TABLE IF EXISTS `person`;CREATE TABLE `person` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `username` varchar(255) DEFAULT NULL,    `age` int(11) DEFAULT NULL,   `password` varchar(255) DEFAULT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8;-- ------------------------------ Records of person-- ----------------------------INSERT INTO `person` VALUES (1, lisi, 21, li123456);INSERT INTO `person` VALUES (2, zhangsan, 23, zhang123456);

   1、增加记录(输入输出参数的调用)

     存储过程如下:

DROP PROCEDURE IF EXISTS proc_person_insert;CREATE PROCEDURE proc_person_insert(    IN uusername VARCHAR(255),    IN uage INT(11),    IN upassword VARCHAR(255),    OUT flag INT(11))BEGIN    START TRANSACTION;        INSERT INTO person (username, age, password) values (uusername, uage, upassword);        SET flag = ROW_COUNT(); -- 保存sql语句操作后影响的行数    COMMIT;    END;

    调用代码如下:

 1     public static void insert(String username, int age, String upassword) { 2         String driver = "com.mysql.jdbc.Driver"; 3         String url = "jdbc:mysql://127.0.0.1:3306/test"; 4         String user = "root"; 5         String password = ""; 6         try { 7             Class.forName(driver); 8             Connection conn = DriverManager.getConnection(url, user, password); 9             String sql = "{call proc_person_insert( ?, ?, ?, ? )}";10             CallableStatement statement = conn.prepareCall(sql);11             statement.setString(1, username); //设置输入参数username12             statement.setInt(2, age); //设置输入参数age13             statement.setString(3, upassword);//设置输入参数password14             statement.registerOutParameter(4, Types.INTEGER);//设置输出参数username15             statement.executeUpdate();16             int flag = statement.getInt(4);//获取输出参数17             System.out.println(flag);// 1添加成功,0添加失败18         } catch (ClassNotFoundException e) {19             e.printStackTrace();20         } catch (SQLException e) {21             e.printStackTrace();22         }23     }

    对于输出参数需要调用statement.registerOutParameter(4, Types.INTEGER)进行注册,执行之后通过statement.getInt()方法来获取。

   2、修改记录(输入输出参数的调用)

    存储过程如下:

DROP PROCEDURE IF EXISTS proc_person_update;CREATE PROCEDURE proc_person_update(    IN uid INT(11),    IN uusername VARCHAR(255),    IN uage INT(11),    IN upassword VARCHAR(255),    OUT flag INT(11))BEGIN    START TRANSACTION;        UPDATE person SET username = uusername, age = uage, password = upassword WHERE id = uid;        SET flag = ROW_COUNT(); -- 保存sql语句操作后影响的行数    COMMIT;END;

    调用代码如下:

 1 public static void update(int id, String username, int age, String upassword) { 2         String driver = "com.mysql.jdbc.Driver"; 3         String url = "jdbc:mysql://127.0.0.1:3306/test"; 4         String user = "root"; 5         String password = ""; 6         try { 7             Class.forName(driver); 8             Connection conn = DriverManager.getConnection(url, user, password); 9             String sql = "{call proc_person_update( ?, ?, ?, ?, ? )}";10             CallableStatement statement = conn.prepareCall(sql);11             statement.setInt(1, id);12             statement.setString(2, username);13             statement.setInt(3, age); 14             statement.setString(4, upassword); 15             statement.registerOutParameter(5, Types.INTEGER);16             statement.executeUpdate();17             int flag = statement.getInt(5);18             System.out.println(flag);// 1添加成功,0添加失败19         } catch (ClassNotFoundException e) {20             e.printStackTrace();21         } catch (SQLException e) {22             e.printStackTrace();23         }24     }

  3、删除记录(使用statement.getUpdateCount()获取影响行数)

    存储过程如下:

DROP PROCEDURE IF EXISTS proc_person_del;CREATE PROCEDURE proc_person_del(    IN pid INT(11) )BEGIN     DELETE FROM person WHERE id = pid;  END;

    调用代码如下:

 1 public  static void delete(int id){ 2         String driver = "com.mysql.jdbc.Driver"; 3         String url = "jdbc:mysql://127.0.0.1:3306/test"; 4         String user = "root"; 5         String password = ""; 6         try { 7             Class.forName(driver); 8             Connection conn = DriverManager.getConnection(url, user, password); 9             String sql = "{call proc_person_del( ?)}";10             CallableStatement statement = conn.prepareCall(sql); 11             statement.setInt(1, id);12             statement.executeUpdate();  13             int flag = statement.getUpdateCount();//使用该语句的时候存储过程DELETE语句外不能出现 START TRANSACTION;COMMINT;14             System.out.println(flag);15         } catch (ClassNotFoundException e) { 16             e.printStackTrace();17         } catch (SQLException e) { 18             e.printStackTrace();19         }20     }

   4、查询一条记录(输入输出)

     存储过程如下:

DROP PROCEDURE IF EXISTS proc_person_find;CREATE PROCEDURE proc_person_find(    IN pid INT(11),    OUT pusername VARCHAR(255),    OUT page INT(11),    OUT ppassword VARCHAR(255))BEGIN    SELECT username, age, password INTO pusername, page, ppassword FROM person WHERE id = pid;END;

    使用在SELECT语句中使用INTO给输出参数赋值

    调用代码如下:

 1     public  static void find(int id){ 2         String driver = "com.mysql.jdbc.Driver"; 3         String url = "jdbc:mysql://127.0.0.1:3306/test"; 4         String user = "root"; 5         String password = ""; 6         try { 7             Class.forName(driver); 8             Connection conn = DriverManager.getConnection(url, user, password); 9             String sql = "{call proc_person_find( ?, ?, ?, ?)}";10             CallableStatement statement = conn.prepareCall(sql);11             statement.setInt(1, id);  12             statement.registerOutParameter(2, Types.VARCHAR);13             statement.registerOutParameter(3, Types.INTEGER);14             statement.registerOutParameter(4, Types.VARCHAR);15             statement.execute();16             String username = statement.getString(2);17             int age = statement.getInt(3);18             String ppassword = statement.getString(4);19             System.out.println("id:" + id);20             System.out.println("username:" + username);21             System.out.println("age:" + age);22             System.out.println("ppassword:" + ppassword);23         } catch (ClassNotFoundException e) {24             e.printStackTrace();25         } catch (SQLException e) {26             e.printStackTrace();27         }28     }

  5、查询一个集合(返回一个集合)

    存储过程如下:

DROP PROCEDURE IF EXISTS proc_person_findAll;CREATE PROCEDURE proc_person_findAll( )BEGIN    SELECT id, username, age, password  FROM person;END;

    调用代码如下:

 1 public  static void findAll(){ 2         String driver = "com.mysql.jdbc.Driver"; 3         String url = "jdbc:mysql://127.0.0.1:3306/test"; 4         String user = "root"; 5         String password = ""; 6         try { 7             Class.forName(driver); 8             Connection conn = DriverManager.getConnection(url, user, password); 9             String sql = "{call proc_person_findAll()}";10             CallableStatement statement = conn.prepareCall(sql); 11             ResultSet resultSet = statement.executeQuery();12             while(resultSet.next()){13                 int id = resultSet.getInt("id");14                 String username =resultSet.getString("username");15                 int age = resultSet.getInt("age");16                 String ppassword = resultSet.getString("password");17                 System.out.println(id + " " + username + " " + age + " " + ppassword);18             } 19         } catch (ClassNotFoundException e) { 20             e.printStackTrace();21         } catch (SQLException e) {22              e.printStackTrace();23         }24     }

     通过statement.executeQuery()方法返回已经ResultSet,再对ResultSet进行遍历。

存储过程之七—java代码调用