iBATIS - 存储过程
您可以使用 iBATIS 配置调用存储过程。首先,让我们了解如何在 MySQL 中创建存储过程。
我们在 MySQL 中有以下 EMPLOYEE 表 −
CREATE TABLE EMPLOYEE ( id INT NOT NULL auto_increment, first_name VARCHAR(20) default NULL, last_name VARCHAR(20) default NULL, salary INT default NULL, PRIMARY KEY (id) );
让我们在 MySQL 数据库中创建以下存储过程 −
DELIMITER $$ DROP PROCEDURE IF EXISTS `testdb`.`getEmp` $$ CREATE PROCEDURE `testdb`.`getEmp` (IN empid INT) BEGIN SELECT * FROM EMPLOYEE WHERE ID = empid; END $$ DELIMITER;
假设 EMPLOYEE 表有以下两条记录 −
mysql> select * from EMPLOYEE; +----+------------+-----------+--------+ | id | first_name | last_name | salary | +----+------------+-----------+--------+ | 1 | Zara | Ali | 5000 | | 2 | Roma | Ali | 3000 | +----+------------+-----------+--------+ 2 row in set (0.00 sec)
员工 POJO 类
要使用存储过程,您无需修改 Employee.java 文件。让我们将其保留为上一章中的原样。
public class Employee { private int id; private String first_name; private String last_name; private int salary; /* 为 Employee 类定义构造函数。 */ public Employee() {} public Employee(String fname, String lname, int salary) { this.first_name = fname; this.last_name = lname; this.salary = salary; } /* 以下是所需的方法定义 */ public int getId() { return id; } public void setId(int id) { this.id = id; } public String getFirstName() { return first_name; } public void setFirstName(String fname) { this.first_name = fname; } public String getLastName() { return last_name; } public void setlastName(String lname) { this.last_name = lname; } public int getSalary() { return salary; } public void setSalary(int salary) { this.salary = salary; } } /* End of Employee */
Employee.xml 文件
在这里,我们将修改 Employee.xml 以引入 <procedure></procedure> 和 <parameterMap></parameterMap> 标签。这里的 <procedure></procedure> 标签将有一个 id,我们将在应用程序中使用它来调用存储过程。
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd"> <sqlMap namespace="Employee"> <!-- Perform Insert Operation --> <insert id="insert" parameterClass="Employee"> INSERT INTO EMPLOYEE(first_name, last_name, salary) values (#first_name#, #last_name#, #salary#) <selectKey resultClass="int" keyProperty="id"> select last_insert_id() as id </selectKey> </insert> <!-- Perform Read Operation --> <select id="getAll" resultClass="Employee"> SELECT * FROM EMPLOYEE </select> <!-- Perform Update Operation --> <update id="update" parameterClass="Employee"> UPDATE EMPLOYEE SET first_name = #first_name# WHERE id = #id# </update> <!-- Perform Delete Operation --> <delete id="delete" parameterClass="int"> DELETE FROM EMPLOYEE WHERE id = #id# </delete> <!-- To call stored procedure. --> <procedure id="getEmpInfo" resultClass="Employee" parameterMap="getEmpInfoCall"> { call getEmp( #acctID# ) } </procedure> <parameterMap id="getEmpInfoCall" class="map"> <parameter property="acctID" jdbcType="INT" javaType="java.lang.Integer" mode="IN"/> </parameterMap> </sqlMap>
IbatisSP.java 文件
此文件具有应用程序级逻辑,可使用 ResultMap 从 Employee 表中读取员工姓名 −
import com.ibatis.common.resources.Resources; import com.ibatis.sqlmap.client.SqlMapClient; import com.ibatis.sqlmap.client.SqlMapClientBuilder; import java.io.*; import java.sql.SQLException; import java.util.*; public class IbatisSP{ public static void main(String[] args) throws IOException,SQLException{ Reader rd = Resources.getResourceAsReader("SqlMapConfig.xml"); SqlMapClient smc = SqlMapClientBuilder.buildSqlMapClient(rd); int id = 1; System.out.println("Going to read employee name....."); Employee e = (Employee) smc.queryForObject ("Employee.getEmpInfo", id); System.out.println("First Name: " + e.getFirstName()); System.out.println("Record name Successfully "); } }
编译和运行
下面是编译和运行上述软件的步骤。在继续编译和执行之前,请确保已正确设置 PATH 和 CLASSPATH。
- 如上所示创建 Employee.xml。
- 如上所示创建 Employee.java 并对其进行编译。
- 如上所示创建 IbatisSP.java 并对其进行编译。
- 执行 IbatisSP 二进制文件以运行该程序。
您将获得以下结果 −
Going to read employee name..... First Name: Zara Record name Successfully