iBATIS - 儲存過程

你可以使用 iBATIS 配置呼叫儲存過程。首先，讓我們瞭解如何在 MySQL 中建立儲存過程。

我們在 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)
);

讓我們在 MySQL 資料庫中建立以下儲存過程 −

DELIMITER $$

   DROP PROCEDURE IF EXISTS `testdb`.`getEmp` $$
   CREATE PROCEDURE `testdb`.`getEmp` 
   (IN empid INT)
	
   BEGIN
      SELECT * FROM EMPLOYEE
      WHERE ID = empid;
   END $$

DELIMITER;

讓我們考慮 EMPLOYEE 表中有兩條如下記錄 −

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 類

要使用儲存過程，你無需修改 Employee.java 檔案。讓我們保留上一章中的內容。

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 檔案

這裡我們修改 Employee.xml 以引入 <procedure></procedure> 和 <parameterMap></parameterMap> 標記。此處 <procedure></procedure> 標記將具有一個 id，我們會在應用程式中使用該 id 來呼叫儲存過程。

<?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 檔案

該檔案具有使用 ResultMap 從 Employee 表中讀取員工姓名的應用程式級邏輯 −

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 ");
   }
} 

編譯和執行

以下是在編譯和執行上述軟體的步驟。請確保在繼續編譯和執行之前已適當地設定路徑和類路徑。

• 如上所示建立 Employee.xml。
• 如上所示建立 Employee.java 並將其編譯。
• 如上所示建立 IbatisSP.java 並將其編譯。
• 執行 IbatisSP 二進位制檔案以執行程式。

你將獲得以下結果 −

Going to read employee name.....
First Name:  Zara
Record name Successfully