iBATIS存储过程

使用iBATIS配置来调用存储过程。为了理解这一章，首先需要了解我们是如何在MySQL中创建一个存储过程。

在继续对本章学习之前，可以通过MySQL存储过程。 

我们已经在MySQL下有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;

考虑EMPLOYEE表是有两条记录如下：

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)

Employee POJO 类:

使用存储过程，你就需要修改Employee.java文件。因此，让我们保持它，因为它是在前一章。

public class Employee {  private int id;  private String first_name;   private String last_name;     private int salary;    /* Define constructors for the Employee class. */  public Employee() {}    public Employee(String fname, String lname, int salary) {    this.first_name = fname;    this.last_name = lname;    this.salary = salary;  } /* Here are the required method definitions */  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 类:

在这里，我们将修改Employee.xml文件介绍<procedure></procedure>和<parameterMap></parameterMap>标记。这里<procedure></procedure>标签将有一个id，我们会用我们的应用程序来调用存储过程。

<?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:

文件将应用程序级别的逻辑读取使用结果映射Employee表员工的姓名name：

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：

下面是步骤来编译并运行上述应用程序。请确保您在进行的编译和执行之前，适当地设置PATH和CLASSPATH。

• 创建Employee.xml如上所示。

• 创建Employee.java如上图所示，并编译它。

• 创建IbatisSP.java如上图所示，并编译它。

• 执行IbatisSP二进制文件来运行程序。

得到以下结果：

Going to read record.....ID:  1First Name:  ZaraLast Name:  AliSalary:  5000Record read Successfully