Ibatis 简明教程
iBATIS - Stored Procedures
你可以使用 iBATIS 配置来调用存储过程。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“员工”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)
);我们将在 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 “员工” 表中有以下两条记录——
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
若要使用存储过程，则无需修改 Employee.java 文件。让它保持上一章中的状态即可。
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></procedure> 和 <parameterMap></parameterMap> 标记。<procedure></procedure> 标记有一个 ID，我们将在应用程序中使用此 ID 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
此文件中包含应用程序级别的逻辑，用于使用 ResultMap 从“员工”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 ");
}
}