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my-test/src/main/java/org/example/join/model/query/column/QueryColumn.java

@@ -3,7 +3,11 @@ package org.example.join.model.query.column;
 import cn.hutool.core.collection.ListUtil;
 import cn.hutool.core.util.ObjectUtil;
 import cn.hutool.core.util.StrUtil;
+import com.baomidou.mybatisplus.core.toolkit.LambdaUtils;
 import com.baomidou.mybatisplus.core.toolkit.StringPool;
+import com.baomidou.mybatisplus.core.toolkit.support.LambdaMeta;
+import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
+import org.apache.ibatis.reflection.property.PropertyNamer;
 import org.example.join.model.IFormat;
 import org.example.join.model.SqlContext;
 
@@ -33,6 +37,11 @@ public class QueryColumn extends AbstractQueryColumn {
         }
     }
 
+    public <T> QueryColumn(SFunction<T, ?> function) {
+        LambdaMeta meta = LambdaUtils.extract(function);
+        this.value = StrUtil.toUnderlineCase(PropertyNamer.methodToProperty(meta.getImplMethodName()));
+    }
+
     private QueryColumn(Object value) {
         this.value = value;
     }

my-test/src/main/java/org/example/join/model/table/ITable.java

@@ -1,5 +1,10 @@
 package org.example.join.model.table;
 
+import cn.hutool.core.util.StrUtil;
+import com.baomidou.mybatisplus.core.toolkit.LambdaUtils;
+import com.baomidou.mybatisplus.core.toolkit.support.LambdaMeta;
+import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
+import org.apache.ibatis.reflection.property.PropertyNamer;
 import org.example.join.model.IFormat;
 import org.example.join.model.query.column.QueryColumnField;
 
@@ -15,4 +20,10 @@ public interface ITable extends IFormat {
         return new QueryColumnField(getAlias(), queryColumnField.getName());
     }
 
+    default <T> QueryColumnField field(SFunction<T, ?> function) {
+        LambdaMeta meta = LambdaUtils.extract(function);
+        String fieldName = StrUtil.toUnderlineCase(PropertyNamer.methodToProperty(meta.getImplMethodName()));
+        return field(fieldName);
+    }
+
 }

my-test/src/test/java/MySpringBootTest.java

@@ -1,12 +1,12 @@
 import com.alibaba.fastjson.JSONObject;
 import lombok.Data;
+import org.dromara.system.domain.SysDept;
 import org.example.DromaraApplication;
-import org.example.join.model.query.function.DefaultFunction;
 import org.example.join.model.query.column.QueryColumn;
 import org.example.join.model.query.column.QueryColumnField;
 import org.example.join.model.query.column.QueryColumnFields;
+import org.example.join.model.query.function.DefaultFunction;
 import org.example.join.model.table.Table;
-import org.example.join.model.table.SubqueryTable;
 import org.example.join.sql.Sql;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -25,7 +25,7 @@ public class MySpringBootTest implements DefaultFunction {
     public final QueryColumnField parent_id = sys_dept.field("parent_id");
     public final QueryColumnField ancestors = sys_dept.field("ancestors");
     public final QueryColumnField status = sys_dept.field("status");
-    public final QueryColumnFields sysDeptAll = new QueryColumnFields(dept_id, tenant_id, parent_id, ancestors);
+    public final QueryColumnFields sysDeptAll = new QueryColumnFields(dept_id, tenant_id, parent_id, ancestors, status);
 
     public static final Table sys_user = new Table("sys_user");
     public final QueryColumnField user_id = sys_user.field("user_id");
@@ -37,31 +37,25 @@ public class MySpringBootTest implements DefaultFunction {
     @Test
     public void testCache() {
 
-        SubqueryTable subqueryTable = Sql.create()
-                .select(
-                        sysDeptAll,
-                        status
-                )
-                .from(sys_dept)
-                .tableAs(sys_dept);
+        Table subquery = new Table("subquery");
 
         List<TestEntity> list = Sql.create()
                 //.logic()
                 //.distinct()
                 .select(
                         dept_id.as(TestEntity::getAaa),
-                        subqueryTable.field(tenant_id).as(TestEntity::getBbb),
-                        subqueryTable.field("status").as("ccc"),
-                        Sql.create().select(groupConcat(new QueryColumn("{0} order by {0} asc", dept_id))).from(sys_dept).as("ddd"),
-                        concat("ssss", 333).as("eee")
+                        subquery.field(tenant_id).as(TestEntity::getBbb),
+                        subquery.field(SysDept::getStatus).as(TestEntity::getCcc),
+                        Sql.create().select(groupConcat(new QueryColumn("{0} order by {0} asc", dept_id))).from(sys_dept).as(TestEntity::getDdd),
+                        concat("ssss", 333).as(TestEntity::getEee)
                 )
-                .from(subqueryTable)
-                .leftJoin(sys_user).on(subqueryTable.field(dept_id).eq(user_id))
+                .from(Sql.create().select(sysDeptAll).from(sys_dept).tableAs(subquery))
+                .leftJoin(sys_user).on(subquery.field(dept_id).eq(user_id))
                 .where(
                         dept_id.in(Sql.create().select(dept_id).from(sys_dept)),
                         Sql.create().select(dept_id).from(sys_dept).limit(1).eq(100)
                 )
-                .orderBy(new QueryColumn("aaa").desc())
+                .orderBy(new QueryColumn(TestEntity::getAaa).desc())
                 .list(TestEntity.class);
 
         System.out.println(JSONObject.toJSONString(list));