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src/main/resources/mapper/PakBlocksMapper.xml

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+<?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.yjdsj.pak.mapper.PakBlocksMapper">
+
+    <resultMap id="BaseResultMap" type="com.yjdsj.pak.domain.PakBlocks">
+        <id column="z" jdbcType="INTEGER" property="z"/>
+        <id column="x" jdbcType="INTEGER" property="x"/>
+        <id column="y" jdbcType="INTEGER" property="y"/>
+        <result property="tile" column="tile" typeHandler="com.yjdsj.common.handler.BlobTypeHandler"/>
+    </resultMap>
+
+    <select id="selectByCondition" resultMap="BaseResultMap">
+        SELECT *
+        FROM ${tableName}
+        WHERE z = #{z}
+          AND x = #{x}
+          AND y = #{y}
+    </select>
+</mapper>