iBatis小结

最近学了iBatis，感觉虽然没有Hibernate那么强大，可是用起来很方便灵活，同JDBC相比代码量大大减少，而且sql与java代码分离，便于维护和移植，基本环境配置如下
1.首先将相关的数据库驱动包和ibatis jar包引入
2.编写配置文件，主体配置文件SqlMapconfig.xml,内容如下

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMapConfig PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN" "http://www.ibatis.com/dtd/sql-map-config-2.dtd">
<sqlMapConfig>

    <transactionManager type="JDBC">  
        <dataSource type="SIMPLE">  
            <property name="JDBC.Driver" value="com.mysql.jdbc.Driver" /> 
            <property name="JDBC.ConnectionURL" value="jdbc:mysql://localhost:3306/ibatis" /> 
            <property name="JDBC.Username" value="root" /> 
            <property name="JDBC.Password" value="123456" /> 
        </dataSource> 
    </transactionManager>   

<sqlMap resource="com/lamp/Student.xml" /> <!-- 映射文件 -->

</sqlMapConfig>

然后是映射文件Student.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE sqlMap PUBLIC "-//iBATIS.com//DTD SQL Map 2.0//EN" "http://www.ibatis.com/dtd/sql-map-2.dtd">
<sqlMap>
	<!-- 
	<resultMap id="Student" class="com.lamp.Student">
		<result property="sid" column="sid" />
		<result property="sname" column="sname" />
		<result property="major" column="major" />
		<result property="birth" column="birth" />
	</resultMap>
          用了typeAlias就可以省略这些配置,javaBean的属性如上，并与数据库表student一一对应
	 -->
	<typeAlias alias="Student" type="com.lamp.Student"/>
	
         <!--查询所有学生-->
	<select id="selectAllStudent" resultClass="Student">
		select * from student
	</select>
	
         <!--根据id查询学生-->
	<select id="selectStudentById" resultClass="Student" parameterClass="int">
		select * 
		from student
		where sid=#sid#
	</select>
	
         <!--插入学生记录-->
	<insert id="insertStudent" parameterClass="Student">
		insert into student (sid,sname,major,birth)
		values				(#sid#,#sname#,#major#,#birth#)
	</insert>
	
         <!--根据sid删除学生记录-->
	<delete id="deleteStudentById" parameterClass="int">
		delete 
		from student
		where sid=#sid#
	</delete>
         
	<!--根据sid更新学生记录学生-->
	<update id="updateStudentById" parameterClass="Student">
		update student
		set sid=#sid#,
			sname=#sname#,
			major=#major#,
			birth=#birth#
		where sid=#sid#
	</update>

	<!--根据学是姓名模糊查询-->
	<select id="selectStudentByName" parameterClass="String" resultClass="Student">
		select *
		from student
		where sname like '%$sname$%'
	</select>

	<!--主键生成方式，因为Mysql不支持创建序列，但是我们可以指定sid为int类型并将其设置为auto_increment也亦可-->
	<insert id="insertStudentBySquence" parameterClass="Student">
		<selectKey resultClass="int" keyProperty="sid">
			select @@IDENTITY as sid
		</selectKey>
		insert into student (sid,sname,major,birth)
			values(#sid#,#sname#,#major#,#birth#)
	</insert>

</sqlMap>

3.最后做测试，以查询所有学生为例

	private static SqlMapClient sqlMap = null;
//加载配置文件
	static{
		try {
			Reader reader = Resources.getResourceAsReader("com/lamp/SqlMapConfig.xml");
			sqlMap = SqlMapClientBuilder.buildSqlMapClient(reader);  
			reader.close();
		} catch (IOException e) {
			e.printStackTrace();
		} 
	}
//方法如下
public List<Student> queryAllStudent() {
		List<Student> studentList = null;
		try {
			studentList = sqlMap.queryForList("selectAllStudent");
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return studentList;
	}