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2. 学习iBATIS
3. iBATIS - Stored Procedures

iBATIS - Stored Procedures

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;

让我们考虑EMPLOYEE表有两条记录如下 -

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 Class

要使用存储过程，您不需要修改Employee.java文件。 让我们保持原样在最后一章。

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 File

在这里，我们将修改Employee.xml以引入 procedure>和 parameterMap>标记。 这里 procedure>标签将有一个id，我们将在我们的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 File

此文件具有应用程序级逻辑，可使用ResultMap从Employee表中读取员工的姓名 -

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 (Compilation and Run)

以下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。

• 创建Employee.xml，如上所示。
• 如上所示创建Employee.java并编译它。
• 如上所示创建IbatisSP.java并编译它。
• 执行IbatisSP二进制文件来运行程序。

你会得到以下结果 -

Going to read record.....
ID:  1
First Name:  Zara
Last Name:  Ali
Salary:  5000
Record read Successfully