使用MyBatis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。
在继续对本节学习之前，可以自行学习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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