1. iBatis 简介:
iBatis 是apache 的一个开源项目,一个O/R Mapping 解决方案,iBatis 最大的特点就是小巧,上手很快。如果不需要太多复杂的功能,iBatis 是能够满足你的要求又足够灵活的最简单的解决方案,现在的iBatis 已经改名为Mybatis 了。
官网为:http://www.mybatis.org/
2. 搭建iBatis 开发环境:
1 、导入相关的jar 包,ibatis-2.3.0.677.jar 、mysql-connector-java-5.1.6-bin.jar
2 、编写配置文件:
Jdbc 连接的属性文件
总配置文件, SqlMapConfig.xml
关于每个实体的映射文件(Map 文件)
3. Demo :
Student.java:
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package com.iflytek.entity;import java.sql.Date;/*** @author
xudongwang 2011-12-31** Email:xdwangiflytek@gmail.com**/public class
Student {// 注意这里需要保证有一个无参构造方法,因为包括Hibernate在内的映射都是使用反射的,如果没有无参构造可能会出现问题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;}@Overridepublic String
toString() {return
"id=" + id + "\tname="
+ name + "\tmajor="
+ birth + "\tscore="+ score + "\n";}} |
SqlMap.properties :
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driver=com.mysql.jdbc.Driverurl=jdbc:mysql://localhost:3306/ibatisusername=rootpassword=123 |
Student.xml :
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<?xml version="1.0"
encoding="UTF-8"
?><!DOCTYPE
sqlMap PUBLIC
"-//ibatis.apache.org//DTD SQL Map 2.0//EN"<sqlMap><!-- 通过typeAlias使得我们在下面使用Student实体类的时候不需要写包名 --><typeAlias alias="Student"
type="com.iflytek.entity.Student"
/><!-- 这样以后改了sql,就不需要去改java代码了 --><!-- id表示select里的sql语句,resultClass表示返回结果的类型 --><select id="selectAllStudent"
resultClass="Student">select * fromtbl_student</select><!-- parameterClass表示参数的内容 --><!-- #表示这是一个外部调用的需要传进的参数,可以理解为占位符 --><select id="selectStudentById"
parameterClass="int"
resultClass="Student">select * from tbl_student where id=#id#</select><!-- 注意这里的resultClass类型,使用Student类型取决于queryForList还是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 intotbl_student(name,birth,score) values(#name#,#birth#,#score#);<selectKey resultClass="int"
keyProperty="id">select @@identity
as inserted<!-- 这里需要说明一下不同的数据库主键的生成,对各自的数据库有不同的方式: --><!-- mysql:SELECT
LAST_INSERT_ID() AS
VALUE --><!-- mssql:select
@@IDENTITY as value --><!-- oracle:SELECT
STOCKIDSEQUENCE.NEXTVAL
AS VALUE FROM DUAL --><!-- 还有一点需要注意的是不同的数据库生产商生成主键的方式不一样,有些是预先生成 (pre-generate)主键的,如Oracle和PostgreSQL。有些是事后生成(post-generate)主键的,如MySQL和SQL
Server 所以如果是Oracle数据库,则需要将selectKey写在insert之前 --></selectKey></insert><delete id="deleteStudentById"
parameterClass="int"><!-- #id#里的id可以随意取,但是上面的insert则会有影响,因为上面的name会从Student里的属性里去查找 --><!-- 我们也可以这样理解,如果有#占位符,则ibatis会调用parameterClass里的属性去赋值 -->delete from tbl_student where id=#id#</delete><update id="updateStudent"
parameterClass="Student">update tbl_student setname=#name#,birth=#birth#,score=#score# where id=#id#</update></sqlMap> |
说明:
如果xml 中没有ibatis 的提示,则window --> Preference--> XML-->XML Catalog---> 点击add
选择uri URI: 请选择本地文件系统上
iBatisDemo1/WebContent/WEB-INF/lib/sql-map-config-2.dtd 文件;
Key Type: 选择Schema Location;
Key: 需要联网的,不建议使用;
SqlMapConfig.xml :
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<?xml version="1.0"
encoding="UTF-8"?><!DOCTYPE
sqlMapConfig PUBLIC
"-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"<sqlMapConfig><!-- 引用JDBC属性的配置文件 --><properties resource="com/iflytek/entity/SqlMap.properties"
/><!-- 使用JDBC的事务管理 --><transactionManager type="JDBC"><!-- 数据源 --><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><!-- 这里可以写多个实体的映射文件 --><sqlMap resource="com/iflytek/entity/Student.xml"
/></sqlMapConfig> |
StudentDao :
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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;// 读取配置文件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("添加学生信息的返回值:"
+ 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("删除学生信息的返回值:"
+ object + ",这里返回的是影响的行数");} 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("更新学生信息的返回值:"
+ object + ",返回影响的行数");} 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 :
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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("测试插入");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("测试根据id查询");System.out.println(studentDaoImpl.selectStudentById(1));System.out.println("测试模糊查询");List<Student> mohuLists = studentDaoImpl.selectStudentByName("李");for (Student student : mohuLists) {System.out.println(student);}System.out.println("测试查询所有");List<Student> students = studentDaoImpl.selectAllStudent();for (Student student : students) {System.out.println(student);}System.out.println("根据id删除学生信息");System.out.println(studentDaoImpl.deleteStudentById(1));System.out.println("测试更新学生信息");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));}} |
4. iBatis 的优缺点:
转自:http://www.cnblogs.com/ycxyyzw/archive/2012/10/13/2722567.html
【转】iBatis简单入门教程,布布扣,bubuko.com
原文:http://www.cnblogs.com/sunada2005/p/3578069.html