MyBatis知多少（24）存储过程
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。
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创建Employee.xml如上所示。
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创建Employee.java如上图所示，并编译它。
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创建IbatisSP.java如上图所示，并编译它。
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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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