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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:  1 First Name:  Zara Last Name:  Ali Salary:  5000 Record read Successfully
   
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