iBATIS存儲過程
使用iBATIS配置來調用存儲過程。爲了理解這一章，首先需要了解我們是如何在MySQL中創建一個存儲過程。
在繼續對本章學習之前，可以通過MySQL存儲過程。
我們已經在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) );
讓我們在MySQL數據庫中創建以下存儲過程。
DELIMITER $$
DROP PROCEDURE IF EXISTS `testdb`.`getEmp` $$
CREATE PROCEDURE `testdb`.`getEmp` (IN empid INT) BEGIN SELECT * FROM EMPLOYEE
WHERE ID = empid; END $$
DELIMITER;
考慮EMPLOYEE表是有兩條記錄如下：
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 類:
使用存儲過程，你就需要修改Employee.java文件。因此，讓我們保持它，因爲它是在前一章。
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 類:
在這裏，我們將修改Employee.xml文件介紹
<sqlMap namespace="Employee"> <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 <select id="getAll" resultClass="Employee"> SELECT * FROM EMPLOYEE <update id="update" parameterClass="Employee"> UPDATE EMPLOYEE
SET first_name = #first_name#
WHERE id = #id# <delete id="delete" parameterClass="int"> DELETE FROM EMPLOYEE
WHERE id = #id# <procedure id="getEmpInfo" resultClass="Employee" parameterMap="getEmpInfoCall"> { call getEmp( #acctID# ) } <parameterMap id="getEmpInfoCall" class="map"> <parameter property="acctID" jdbcType="INT" javaType="java.lang.Integer" mode="IN"/>
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：
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之前，適當地設置PATH和CLASSPATH。
創建Employee.xml如上所示。
創建Employee.java如上圖所示，並編譯它。
創建IbatisSP.java如上圖所示，並編譯它。
執行IbatisSP二進制文件來運行程序。
得到以下結果：
Going to read record..... ID: 1 First Name: Zara Last Name: Ali Salary: 5000 Record read Successfully