MyBatis知多少(24)存儲過程

使用MyBatis配置來調用存儲過程。爲了理解這一章,首先須要瞭解咱們是如何在MySQL中建立一個存儲過程。html

在繼續對本節學習以前,能夠自行學習MySQL存儲過程。 java

咱們已經在MySQL下有EMPLOYEE表:mysql

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)
);

 

讓咱們在MySQL數據庫中建立如下存儲過程。sql

DELIMITER $$

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

DELIMITER;

 

考慮EMPLOYEE表是有兩條記錄以下:數據庫

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:

使用存儲過程,你就須要修改Employee.java文件。所以,讓咱們保持它,由於它是在前一章。apache

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 類:

在這裏,咱們將修改Employee.xml文件介紹<procedure></procedure>和<parameterMap></parameterMap>標記。這裏<procedure></procedure>標籤將有一個id,咱們會用咱們的應用程序來調用存儲過程。學習

<?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:

文件將應用程序級別的邏輯讀取使用結果映射Employee表員工的姓名name:ui

 
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 ");

  }
}

 

編譯和運行:

下面是步驟來編譯並運行上述應用程序。請確保您在進行的編譯和執行以前,適當地設置PATH和CLASSPATH。this

  • 建立Employee.xml如上所示。spa

  • 建立Employee.java如上圖所示,並編譯它。

  • 建立IbatisSP.java如上圖所示,並編譯它。

  • 執行IbatisSP二進制文件來運行程序。

獲得如下結果:

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

系列文章:

MyBatis知多少(1)

MyBatis知多少(2)

MyBatis知多少(3)

MyBatis知多少(4)MyBatis的優點

MyBatis知多少(5)業務對象模型

MyBatis知多少(6)表現層與業務邏輯層

MyBatis知多少(7)持久層

MyBatis知多少(8)關係型數據庫

MyBatis知多少(9)不一樣類型的數據庫

MyBatis知多少(10)應用程序數據庫

MyBatis知多少(11)企業數據庫

MyBatis知多少(12)私有數據庫

MyBatis知多少(13)MyBatis如何解決數據庫的常見問題

MyBatis知多少(14)分散的數據庫系統

MyBatis知多少(15)數據模型

MyBatis知多少(16)MyBatis映射

MyBatis知多少(17)MyBatis和JDBC

MyBatis知多少(18)MyBatis系統

MyBatis知多少(19)MyBatis操做

MyBatis知多少(20)MyBatis讀取操做

MyBatis知多少(21)更新操做

MyBatis知多少(22)MyBatis刪除操做

MyBatis知多少(23)MyBatis結果映射

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