JDBC之存储过程

Posted 2020-08-10 xiaodong135

存储过程的语法创建就不说了，这里这篇博客 就挺详细了http://blog.sina.com.cn/s/blog_52d20fbf0100ofd5.html。

1. Java代码调用没有参数的存错过程

　　首显示创建一个个存储过程：

DELIMITER $$

USE `jdbcdemo`$$

DROP PROCEDURE IF EXISTS `selectAll`$$

CREATE DEFINER=`root`@`localhost` PROCEDURE `selectAll`()
BEGIN
SELECT * FROM boy; 得到所有的数据
    END$$

DELIMITER ;

 其次在代码中调用这个存储过程，当然首先还是获得数据库的连接。 获取连接在上一片博客中http://www.cnblogs.com/xlurenjia/p/5901983.html。

Java 中的代码

public List<Boy> querayProcedure(){
        List<Boy> list = new ArrayList<>();
        Connection conn = DBUtil.getConnection();
        try {
            CallableStatement statement = conn.prepareCall("call selectAll()"); 调用存储过程
            statement.execute();
            ResultSet rs = statement.getResultSet();  // 获得结果集，其余操作就跟平常的操作都一样了
            while (rs.next()) {
                String name = rs.getString("user_name");
                Boy gd = new Boy();
                gd.setUser_name(name);
                list.add(gd);
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        return list;
    }

2. 有带IN参数的存储过程

DELIMITER $$

USE `jdbcdemo`$$

DROP PROCEDURE IF EXISTS `select_filter`$$

CREATE DEFINER=`root`@`localhost` PROCEDURE `select_filter`(IN sp_name VARCHAR(20))
BEGIN
    IF sp_name IS NULL OR sp_name = \'\' THEN
      SELECT * FROM boy;
        ELSE
      IF LENGTH(sp_name) = 11 AND SUBSTRING(sp_name, 1, 1)=1 THEN
        SELECT * FROM boy WHERE mobile = sp_name;
      ELSE
        SELECT * FROM boy WHERE user_name LIKE CONCAT(\'%\', sp_name, \'%\');
      END IF;
    END IF;
    END$$

DELIMITER ;

Java中的代码

public List<Boy> querayProcedureFilter(String sp_name){
        List<Boy> list = new ArrayList<>();
        Connection conn = DBUtil.getConnection();
        try {
            CallableStatement statement = conn.prepareCall("call select_filter(?)");
            statement.setString(1, sp_name); //将参数穿进去
            statement.execute();
            ResultSet rs = statement.getResultSet();
            while (rs.next()) {
                String name = rs.getString("user_name");
                Boy gd = new Boy();
                gd.setUser_name(name);
                list.add(gd);
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        return list;
    }

3. 带有OUT的存储过程

DELIMITER $$

USE `jdbcdemo`$$

DROP PROCEDURE IF EXISTS `select_count`$$

CREATE DEFINER=`root`@`localhost` PROCEDURE `select_count`( OUT sp_count INT)
BEGIN
SELECT COUNT(1)INTO sp_count FROM boy;
END$$

DELIMITER ;

Java中代码

public int querayCountByProceureOut(){
    
        int count = 0;
        try {
            Connection conn = DBUtil.getConnection();
            CallableStatement cs = conn.prepareCall("call select_count(?)");
            cs.registerOutParameter(1, Types.INTEGER); // 注册你要获得的结果，执行之后获得结果
            cs.execute();
            count = cs.getInt(1);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        return count;
    }