[MyBatis日记]问题汇总

问题一：mybatis映射文件insert不执行，而直接用sql则可以插入成功

解决方案：

问题二：中文显示乱码问题

解决方案：

问题三：XML文件中大于号小于号问题

解决方案一：用了转义字符把>和<替换掉

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

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 

<mapper namespace="com.sjf.mapper.CourseMapper">

 

	<resultMap id = "CourseResultMap" type="com.sjf.bean.Course" >

		<id property="ID" column="ID"/>

		<result property="name" column="name"/>

		<result property="desc" column="description"/>

		<result property = "startDate" column = "startDate"/>

		<result property = "endDate" column = "endDate"/>

	</resultMap>

	

	<select id="getCourseByCondation" parameterType="hashmap" resultMap="CourseResultMap"> 

    	SELECT * FROM Course 

    	WHERE teacherID = #{teacherID} 

    	<if test = "courseName != null" >

    		AND NAME = #{courseName}

    	</if>

    	<if test = "startDate != null">

    		AND startDate >= #{startDate}

    	</if>

    	<if test = "endDate != null">

    		AND endDate  <= #{endDate}

    	</if>

  	</select>

</mapper> 

转义字符表：

解决方案二：

因为这个是xml格式的，所以不允许出现类似“>”这样的字符，但是都可以使用<![CDATA[ ]]>符号进行说明，将此类符号不进行解析。

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

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 

<mapper namespace="com.sjf.mapper.CourseMapper">

 

	<resultMap id = "CourseResultMap" type="com.sjf.bean.Course" >

		<id property="ID" column="ID"/>

		<result property="name" column="name"/>

		<result property="desc" column="description"/>

		<result property = "startDate" column = "startDate"/>

		<result property = "endDate" column = "endDate"/>

	</resultMap>

	

	<select id="getCourseByCondation" parameterType="hashmap" resultMap="CourseResultMap"> 

    	SELECT * FROM Course 

    	WHERE teacherID = #{teacherID} 

    	<if test = "courseName != null" >

    		AND NAME = #{courseName}

    	</if>

    	<if test = "startDate != null">

    		<![CDATA[AND startDate >= #{startDate} ]]>

    	</if>

    	<if test = "endDate != null">

    		<![CDATA[AND endDate  <= #{endDate} ]]>

    	</if>

  	</select>

</mapper>