MyBatis常用知识点汇聚

 

1、查询条件

<!-- 查询条件SQL（动态生成） -->
<sql id="condition_sql">
	<if test="id != null and id != ''"> and ID = #{id}</if>
	<if test="fieldName != null and fieldName != ''"> and FIELD_NAME like CONCAT(CONCAT('%',#{fieldName}), '%') </if>
	<if test="beginDate!=null and beginDate!=''">
	<![CDATA[ and DATE_FORMAT(CREATE_TIME, '%Y-%m-%d') >=  DATE_FORMAT(#{beginDate}, '%Y-%m-%d') ]]>
	</if>
	<if test="endDate!=null and endDate!=''">
	<![CDATA[ and DATE_FORMAT(CREATE_TIME, '%Y-%m-%d') <=  DATE_FORMAT(#{endDate}, '%Y-%m-%d') ]]>
	</if>
</sql

 2、String字符串参数 返回列表

<select id="xxx" parameterType="java.lang.String" resultMap="BaseResultMap">
	select
	<include refid="Base_Column_List" />
	from XXX where code = #{0}  
</select>

 3、String字符串参数，返回列表

<select id="selectByName" resultMap="BaseResultMap" parameterType="java.lang.String" >
    select 
    <include refid="Base_Column_List" />
    from tb_xxx
    where name = #{name,jdbcType=VARCHAR}
</select>

 4、参数传列表 sql用in

JAVA：

List<Integer> list = new ArrayList<String>();
Map<String, Object> paramMap = new HashMap<String, Object>();	
param.put("list", list);
Pager<XxxDto> page = this.xxxService.queryByXxx(param, 0, 1000);

 XML：

<choose>
<when test="list != null and list['size'] &gt; 0">
	and xxx in 
	<foreach close=")" collection="list" item="item" open="(" separator=",">
		#{item,jdbcType=TINYINT}
	</foreach>
</when>
<otherwise>
	and 1=2
</otherwise>
</choose>