iBatis 的優缺點:
優點:
1、 減少代碼量,簡單;
2、 性能增強;
3、 Sql 語句與程序代碼分離;
4、 增強了移植性;
缺點:
1、 和Hibernate 相比,sql 需要自己寫;
2、 參數數量只能有一個,多個參數時不太方便;
搭建iBatis 開發環境:
1 、導入相關的jar 包,ibatis-2.3.0.677.jar 、mysql-connector-java-5.1.6-bin.jar
2 、編寫配置文件:
????????????? Jdbc 連接的屬性文件
????????????? 總配置文件, SqlMapConfig.xml
????????????? 關于每個實體的映射文件(Map 文件)
Demo :
Student.java:
package com.iflytek.entity;
import java.sql.Date;
/**
?* @author xudongwang 2011-12-31
?*
?*???????? Email:xdwangiflytek@gmail.com
?*
?*/
public class Student {
?? ?// 注意這里需要保證有一個無參構造方法,因為包括Hibernate在內的映射都是使用反射的,如果沒有無參構造可能會出現問題
?? ?private int id;
?? ?private String name;
?? ?private Date birth;
?? ?private float score;
?? ?public int getId() {
?? ??? ?return id;
?? ?}
?? ?public void setId(int id) {
?? ??? ?this.id = id;
?? ?}
?? ?public String getName() {
?? ??? ?return name;
?? ?}
?? ?public void setName(String name) {
?? ??? ?this.name = name;
?? ?}
?? ?public Date getBirth() {
?? ??? ?return birth;
?? ?}
?? ?public void setBirth(Date birth) {
?? ??? ?this.birth = birth;
?? ?}
?? ?public float getScore() {
?? ??? ?return score;
?? ?}
?? ?public void setScore(float score) {
?? ??? ?this.score = score;
?? ?}
?? ?@Override
?? ?public String toString() {
?? ??? ?return "id=" + id + "\tname=" + name + "\tmajor=" + birth + "\tscore="
?? ??? ??? ??? ?+ score + "\n";
?? ?}
}
SqlMap.properties :
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/ibatis
username=root
password=123
Student.xml :
<?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>
?? ?<!-- 通過typeAlias使得我們在下面使用Student實體類的時候不需要寫包名 -->
?? ?<typeAlias alias="Student" type="com.iflytek.entity.Student" />
?? ?<!-- 這樣以后改了sql,就不需要去改java代碼了 -->
?? ?<!-- id表示select里的sql語句,resultClass表示返回結果的類型 -->
?? ?<select id="selectAllStudent" resultClass="Student">
?? ??? ?select * from
?? ??? ?tbl_student
?? ?</select>
?? ?<!-- parameterClass表示參數的內容 -->
?? ?<!-- #表示這是一個外部調用的需要傳進的參數,可以理解為占位符 -->
?? ?<select id="selectStudentById" parameterClass="int" resultClass="Student">
?? ??? ?select * from tbl_student where id=#id#
?? ?</select>
?? ?<!-- 注意這里的resultClass類型,使用Student類型取決于queryForList還是queryForObject -->
?? ?<select id="selectStudentByName" parameterClass="String"
?? ??? ?resultClass="Student">
?? ??? ?select name,birth,score from tbl_student where name like
?? ??? ?'%$name$%'
?? ?</select>
?? ?<insert id="addStudent" parameterClass="Student">
?? ??? ?insert into
?? ??? ?tbl_student(name,birth,score) values
?? ??? ?(#name#,#birth#,#score#);
?? ??? ?<selectKey resultClass="int" keyProperty="id">
?? ??? ??? ?select @@identity as inserted
?? ??? ??? ?<!-- 這里需要說明一下不同的數據庫主鍵的生成,對各自的數據庫有不同的方式: -->
?? ??? ??? ?<!-- mysql:SELECT LAST_INSERT_ID() AS VALUE -->
?? ??? ??? ?<!-- mssql:select @@IDENTITY as value -->
?? ??? ??? ?<!-- oracle:SELECT STOCKIDSEQUENCE.NEXTVAL AS VALUE FROM DUAL -->
?? ??? ??? ?<!-- 還有一點需要注意的是不同的數據庫生產商生成主鍵的方式不一樣,有些是預先生成 (pre-generate)主鍵的,如Oracle和PostgreSQL。
?? ??? ??? ??? ?有些是事后生成(post-generate)主鍵的,如MySQL和SQL Server 所以如果是Oracle數據庫,則需要將selectKey寫在insert之前 -->
?? ??? ?</selectKey>
?? ?</insert>
?? ?<delete id="deleteStudentById" parameterClass="int">
?? ??? ?<!-- #id#里的id可以隨意取,但是上面的insert則會有影響,因為上面的name會從Student里的屬性里去查找 -->
?? ??? ?<!-- 我們也可以這樣理解,如果有#占位符,則ibatis會調用parameterClass里的屬性去賦值 -->
?? ??? ?delete from tbl_student where id=#id#
?? ?</delete>
?? ?<update id="updateStudent" parameterClass="Student">
?? ??? ?update tbl_student set
?? ??? ?name=#name#,birth=#birth#,score=#score# where id=#id#
?? ?</update>
</sqlMap>
說明:
如果xml 中沒有ibatis 的提示,則window --> Preference--> XML-->XML Catalog---> 點擊add
選擇uri URI: 請選擇本地文件系統上
iBatisDemo1/WebContent/WEB-INF/lib/sql-map-config-2.dtd 文件;
Key Type: 選擇Schema Location;
Key: 需要聯網的,不建議使用;
SqlMapConfig.xml :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMapConfig PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"
??? "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">
<sqlMapConfig>
?? ?<!-- 引用JDBC屬性的配置文件 -->
?? ?<properties resource="com/iflytek/entity/SqlMap.properties" />
?? ?<!-- 使用JDBC的事務管理 -->
?? ?<transactionManager type="JDBC">
?? ??? ?<!-- 數據源 -->
?? ??? ?<dataSource type="SIMPLE">
?? ??? ??? ?<property name="JDBC.Driver" value="${driver}" />
?? ??? ??? ?<property name="JDBC.ConnectionURL" value="${url}" />
?? ??? ??? ?<property name="JDBC.Username" value="${username}" />
?? ??? ??? ?<property name="JDBC.Password" value="${password}" />
?? ??? ?</dataSource>
?? ?</transactionManager>
?? ?<!-- 這里可以寫多個實體的映射文件 -->
?? ?<sqlMap resource="com/iflytek/entity/Student.xml" />
</sqlMapConfig>
StudentDao :
package com.iflytek.dao;
import java.util.List;
import com.iflytek.entity.Student;
/**
?* @author xudongwang 2011-12-31
?*
?*???????? Email:xdwangiflytek@gmail.com
?*
?*/
public interface StudentDao {
?? ?/**
?? ? * 添加學生信息
?? ? *
?? ? * @param student
?? ? *??????????? 學生實體
?? ? * @return 返回是否添加成功
?? ? */
?? ?public boolean addStudent(Student student);
?? ?/**
?? ? * 根據學生id刪除學生信息
?? ? *
?? ? * @param id
?? ? *??????????? 學生id
?? ? * @return 刪除是否成功
?? ? */
?? ?public boolean deleteStudentById(int id);
?? ?/**
?? ? * 更新學生信息
?? ? *
?? ? * @param student
?? ? *??????????? 學生實體
?? ? * @return 更新是否成功
?? ? */
?? ?public boolean updateStudent(Student student);
?? ?/**
?? ? * 查詢全部學生信息
?? ? *
?? ? * @return 返回學生列表
?? ? */
?? ?public List<Student> selectAllStudent();
?? ?/**
?? ? * 根據學生姓名模糊查詢學生信息
?? ? *
?? ? * @param name
?? ? *??????????? 學生姓名
?? ? * @return 學生信息列表
?? ? */
?? ?public List<Student> selectStudentByName(String name);
?? ?/**
?? ? * 根據學生id查詢學生信息
?? ? *
?? ? * @param id
?? ? *??????????? 學生id
?? ? * @return 學生對象
?? ? */
?? ?public Student selectStudentById(int id);
}
StudentDaoImpl :
package com.iflytek.daoimpl;
import java.io.IOException;
import java.io.Reader;
import java.sql.SQLException;
import java.util.List;
import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
import com.iflytek.dao.StudentDao;
import com.iflytek.entity.Student;
/**
?* @author xudongwang 2011-12-31
?*
?*???????? Email:xdwangiflytek@gmail.com
?*
?*/
public class StudentDaoImpl implements StudentDao {
?? ?private static SqlMapClient sqlMapClient = null;
?? ?// 讀取配置文件
?? ?static {
?? ??? ?try {
?? ??? ??? ?Reader reader = Resources
?? ??? ??? ??? ??? ?.getResourceAsReader("com/iflytek/entity/SqlMapConfig.xml");
?? ??? ??? ?sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
?? ??? ??? ?reader.close();
?? ??? ?} catch (IOException e) {
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ?}
?? ?public boolean addStudent(Student student) {
?? ??? ?Object object = null;
?? ??? ?boolean flag = false;
?? ??? ?try {
?? ??? ??? ?object = sqlMapClient.insert("addStudent", student);
?? ??? ??? ?System.out.println("添加學生信息的返回值:" + object);
?? ??? ?} catch (SQLException e) {
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ??? ?if (object != null) {
?? ??? ??? ?flag = true;
?? ??? ?}
?? ??? ?return flag;
?? ?}
?? ?public boolean deleteStudentById(int id) {
?? ??? ?boolean flag = false;
?? ??? ?Object object = null;
?? ??? ?try {
?? ??? ??? ?object = sqlMapClient.delete("deleteStudentById", id);
?? ??? ??? ?System.out.println("刪除學生信息的返回值:" + object + ",這里返回的是影響的行數");
?? ??? ?} catch (SQLException e) {
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ??? ?if (object != null) {
?? ??? ??? ?flag = true;
?? ??? ?}
?? ??? ?return flag;
?? ?}
?? ?public boolean updateStudent(Student student) {
?? ??? ?boolean flag = false;
?? ??? ?Object object = false;
?? ??? ?try {
?? ??? ??? ?object = sqlMapClient.update("updateStudent", student);
?? ??? ??? ?System.out.println("更新學生信息的返回值:" + object + ",返回影響的行數");
?? ??? ?} catch (SQLException e) {
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ??? ?if (object != null) {
?? ??? ??? ?flag = true;
?? ??? ?}
?? ??? ?return flag;
?? ?}
?? ?public List<Student> selectAllStudent() {
?? ??? ?List<Student> students = null;
?? ??? ?try {
?? ??? ??? ?students = sqlMapClient.queryForList("selectAllStudent");
?? ??? ?} catch (SQLException e) {
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ??? ?return students;
?? ?}
?? ?public List<Student> selectStudentByName(String name) {
?? ??? ?List<Student> students = null;
?? ??? ?try {
?? ??? ??? ?students = sqlMapClient.queryForList("selectStudentByName",name);
?? ??? ?} catch (SQLException e) {
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ??? ?return students;
?? ?}
?? ?public Student selectStudentById(int id) {
?? ??? ?Student student = null;
?? ??? ?try {
?? ??? ??? ?student = (Student) sqlMapClient.queryForObject(
?? ??? ??? ??? ??? ?"selectStudentById", id);
?? ??? ?} catch (SQLException e) {
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ??? ?return student;
?? ?}
}
TestIbatis.java :
package com.iflytek.test;
import java.sql.Date;
import java.util.List;
import com.iflytek.daoimpl.StudentDaoImpl;
import com.iflytek.entity.Student;
/**
?* @author xudongwang 2011-12-31
?*
?*???????? Email:xdwangiflytek@gmail.com
?*
?*/
public class TestIbatis {
?? ?public static void main(String[] args) {
?? ??? ?StudentDaoImpl studentDaoImpl = new StudentDaoImpl();
?? ??? ?System.out.println("測試插入");
?? ??? ?Student addStudent = new Student();
?? ??? ?addStudent.setName("李四");
?? ??? ?addStudent.setBirth(Date.valueOf("2011-09-02"));
?? ??? ?addStudent.setScore(88);
?? ??? ?System.out.println(studentDaoImpl.addStudent(addStudent));
?? ??? ?System.out.println("測試根據id查詢");
?? ??? ?System.out.println(studentDaoImpl.selectStudentById(1));
?? ??? ?System.out.println("測試模糊查詢");
?? ??? ?List<Student> mohuLists = studentDaoImpl.selectStudentByName("李");
?? ??? ?for (Student student : mohuLists) {
?? ??? ??? ?System.out.println(student);
?? ??? ?}
?? ??? ?System.out.println("測試查詢所有");
?? ??? ?List<Student> students = studentDaoImpl.selectAllStudent();
?? ??? ?for (Student student : students) {
?? ??? ??? ?System.out.println(student);
?? ??? ?}
?? ??? ?System.out.println("根據id刪除學生信息");
?? ??? ?System.out.println(studentDaoImpl.deleteStudentById(1));
?? ??? ?System.out.println("測試更新學生信息");
?? ??? ?Student updateStudent = new Student();
?? ??? ?updateStudent.setId(1);
?? ??? ?updateStudent.setName("李四1");
?? ??? ?updateStudent.setBirth(Date.valueOf("2011-08-07"));
?? ??? ?updateStudent.setScore(21);
?? ??? ?System.out.println(studentDaoImpl.updateStudent(updateStudent));
?? ?}
}