优化代码生成主子表关联查询方式

ruoyi-generator/src/main/resources/vm/xml/mapper.xml.vm

@@ -15,12 +15,12 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 #if($table.sub)
 
     <resultMap id="${ClassName}${subClassName}Result" type="${ClassName}" extends="${ClassName}Result">
-        <collection property="${subclassName}List" notNullColumn="sub_${subTable.pkColumn.columnName}" javaType="java.util.List" resultMap="${subClassName}Result" />
+        <collection property="${subclassName}List" ofType="${subClassName}" column="${subTableFkName}" select="select${subClassName}List" />
     </resultMap>
 
     <resultMap type="${subClassName}" id="${subClassName}Result">
 #foreach ($column in $subTable.columns)
-        <result property="${column.javaField}"    column="sub_${column.columnName}"    />
+        <result property="${column.javaField}"    column="${column.columnName}"    />
 #end
     </resultMap>
 #end
@@ -74,15 +74,18 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         left join ${tableName} p on p.${pkColumn.columnName} = t.${tree_parent_code}
         where t.${pkColumn.columnName} = #{${pkColumn.javaField}}
 #elseif($table.sub)
-        select#foreach($column in $columns) a.$column.columnName#if($foreach.count != $columns.size()),#end#end,
-           #foreach($column in $subTable.columns) b.$column.columnName as sub_$column.columnName#if($foreach.count != $subTable.columns.size()),#end#end
-
-        from ${tableName} a
-        left join ${subTableName} b on b.${subTableFkName} = a.${pkColumn.columnName}
-        where a.${pkColumn.columnName} = #{${pkColumn.javaField}}
+        select#foreach($column in $columns) $column.columnName#if($foreach.count != $columns.size()),#end#end
+        from ${tableName}
+        where ${pkColumn.columnName} = #{${pkColumn.javaField}}
 #end
     </select>
 
+    <select id="select${subClassName}List" resultType="${subClassName}" resultMap="${subClassName}Result">
+        select#foreach ($column in $subTable.columns) $column.columnName#if($foreach.count != $subTable.columns.size()),#end#end
+        from ${subTableName}
+        where ${subTableFkName} = #{${subTableFkName}}
+    </select>
+
     <insert id="insert${ClassName}" parameterType="${ClassName}"#if($pkColumn.increment) useGeneratedKeys="true" keyProperty="$pkColumn.javaField"#end>
         insert into ${tableName}
         <trim prefix="(" suffix=")" suffixOverrides=",">