first 添加分页

mybatis-plus-join-adapter/jsqlparser/mybatis-plus-join-adapter-jsqlparser-v46/pom.xml

@@ -35,15 +35,6 @@
         <url>https://github.com/yulichang/mybatis-plus-join</url>
     </scm>
 
-    <properties>
-        <jdkVersion>1.8</jdkVersion>
-        <jdkVersion.test>1.8</jdkVersion.test>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <github.global.server>github</github.global.server>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.baomidou</groupId>

mybatis-plus-join-adapter/jsqlparser/mybatis-plus-join-adapter-jsqlparser/pom.xml

@@ -35,15 +35,6 @@
         <url>https://github.com/yulichang/mybatis-plus-join</url>
     </scm>
 
-    <properties>
-        <jdkVersion>1.8</jdkVersion>
-        <jdkVersion.test>1.8</jdkVersion.test>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <github.global.server>github</github.global.server>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.baomidou</groupId>

mybatis-plus-join-adapter/mybatis-plus-join-adapter-v33x/pom.xml

@@ -33,15 +33,6 @@
         <url>https://github.com/yulichang/mybatis-plus-join</url>
     </scm>
 
-    <properties>
-        <jdkVersion>1.8</jdkVersion>
-        <jdkVersion.test>1.8</jdkVersion.test>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <github.global.server>github</github.global.server>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.github.yulichang</groupId>

mybatis-plus-join-adapter/mybatis-plus-join-adapter-v3431/pom.xml

@@ -33,15 +33,6 @@
         <url>https://github.com/yulichang/mybatis-plus-join</url>
     </scm>
 
-    <properties>
-        <jdkVersion>1.8</jdkVersion>
-        <jdkVersion.test>1.8</jdkVersion.test>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <github.global.server>github</github.global.server>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.github.yulichang</groupId>

mybatis-plus-join-adapter/mybatis-plus-join-adapter-v352/pom.xml

@@ -33,15 +33,6 @@
         <url>https://github.com/yulichang/mybatis-plus-join</url>
     </scm>
 
-    <properties>
-        <jdkVersion>1.8</jdkVersion>
-        <jdkVersion.test>1.8</jdkVersion.test>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <github.global.server>github</github.global.server>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.baomidou</groupId>

mybatis-plus-join-adapter/mybatis-plus-join-adapter-v355/pom.xml

@@ -33,15 +33,6 @@
         <url>https://github.com/yulichang/mybatis-plus-join</url>
     </scm>
 
-    <properties>
-        <jdkVersion>1.8</jdkVersion>
-        <jdkVersion.test>1.8</jdkVersion.test>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <github.global.server>github</github.global.server>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.github.yulichang</groupId>

mybatis-plus-join-annotation/pom.xml

@@ -33,13 +33,4 @@
         <developerConnection>scm:git:https://github.com/yulichang/mybatis-plus-join.git</developerConnection>
         <url>https://github.com/yulichang/mybatis-plus-join</url>
     </scm>
-
-    <properties>
-        <jdkVersion>1.8</jdkVersion>
-        <jdkVersion.test>1.8</jdkVersion.test>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <github.global.server>github</github.global.server>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
 </project>

mybatis-plus-join-core/src/main/java/com/github/yulichang/kt/KtAbstractLambdaWrapper.java

@@ -55,6 +55,8 @@ public abstract class KtAbstractLambdaWrapper<T, Children extends KtAbstractLamb
      */
     @Getter
     protected boolean resultMap = false;
+    @Getter
+    protected boolean resultMapCollection = false;
     /**
      * 表序号
      */
@@ -445,6 +447,7 @@ public abstract class KtAbstractLambdaWrapper<T, Children extends KtAbstractLamb
         super.clear();
         this.alias = ConfigProperties.tableAlias;
         this.resultMap = false;
+        this.resultMapCollection = false;
         this.tableIndex = 1;
         this.dynamicTableName = false;
         this.tableFunc = null;

mybatis-plus-join-core/src/main/java/com/github/yulichang/kt/KtLambdaWrapper.java

@@ -159,7 +159,10 @@ public class KtLambdaWrapper<T> extends KtAbstractLambdaWrapper<T, KtLambdaWrapp
     }
 
     @Override
-    public void addLabel(Label<?> label) {
+    public void addLabel(Label<?> label, boolean isCollection) {
+        if (isCollection) {
+            this.resultMapCollection = true;
+        }
         this.resultMap = true;
         this.resultMapMybatisLabel.add(label);
     }

mybatis-plus-join-core/src/main/java/com/github/yulichang/kt/interfaces/QueryLabel.java

@@ -23,7 +23,7 @@ import java.util.Map;
 @SuppressWarnings({"unused", "DuplicatedCode"})
 public interface QueryLabel<Children> {
 
-    void addLabel(Label<?> label);
+    void addLabel(Label<?> label, boolean isCollection);
 
     Children getChildren();
 
@@ -62,7 +62,7 @@ public interface QueryLabel<Children> {
         } else {
             builder = new MybatisLabel.Builder<>(prefix, dtoFieldName, child, field.getType(), genericType, true);
         }
-        addLabel(builder.build());
+        addLabel(builder.build(), true);
         return getChildren();
     }
 
@@ -104,7 +104,7 @@ public interface QueryLabel<Children> {
         Class<?> genericType = MPJReflectionKit.getGenericType(field.getField());
         MybatisLabelFree.Builder<?> builder = new MybatisLabelFree.Builder<>(dtoFieldName, field.getType(), genericType);
         MybatisLabelFree.Builder<?> czBuilder = collection.apply(builder);
-        addLabel(czBuilder.build());
+        addLabel(czBuilder.build(), true);
         return getChildren();
     }
 
@@ -118,7 +118,7 @@ public interface QueryLabel<Children> {
         Class<?> genericType = MPJReflectionKit.getGenericType(field.getField());
         MybatisLabel.Builder<?, ?> builder = new MybatisLabel.Builder<>(prefix, dtoFieldName, child, field.getType(), genericType, false);
         MybatisLabel.Builder<?, ?> czBuilder = collection.apply(builder);
-        addLabel(czBuilder.build());
+        addLabel(czBuilder.build(), true);
         return getChildren();
     }
 
@@ -139,7 +139,7 @@ public interface QueryLabel<Children> {
         MybatisLabel.Builder<?, ?> builder;
         builder = new MybatisLabel.Builder<>(StringUtils.isBlank(prefix) ? null : prefix,
                 dtoFieldName, child, field.getType(), (Class<?>) field.getType(), true);
-        addLabel(builder.build());
+        addLabel(builder.build(), false);
         return getChildren();
     }
 
@@ -160,7 +160,7 @@ public interface QueryLabel<Children> {
         Assert.isFalse(Collection.class.isAssignableFrom(field.getType()), "association 不支持集合类");
         MybatisLabelFree.Builder<?> builder = new MybatisLabelFree.Builder<>(dtoFieldName, field.getType(), (Class<?>) field.getType());
         MybatisLabelFree.Builder<?> cfBuilder = collection.apply(builder);
-        addLabel(cfBuilder.build());
+        addLabel(cfBuilder.build(), false);
         return getChildren();
     }
 
@@ -172,7 +172,7 @@ public interface QueryLabel<Children> {
         MybatisLabel.Builder<?, ?> builder = new MybatisLabel.Builder<>(StringUtils.isBlank(prefix) ? null : prefix,
                 dtoFieldName, child, field.getType(), (Class<?>) field.getType(), false);
         MybatisLabel.Builder<?, ?> cfBuilder = collection.apply(builder);
-        addLabel(cfBuilder.build());
+        addLabel(cfBuilder.build(), false);
         return getChildren();
     }
 }

mybatis-plus-join-core/src/main/java/com/github/yulichang/query/MPJQueryWrapper.java

@@ -364,6 +364,11 @@ public class MPJQueryWrapper<T> extends AbstractWrapper<T, String, MPJQueryWrapp
         }
     }
 
+    @Override
+    public boolean isResultMapCollection() {
+        return false;
+    }
+
     @Override
     public MPJQueryWrapper<T> setEntityClass(Class<T> entityClass) {
         try {

mybatis-plus-join-core/src/main/java/com/github/yulichang/wrapper/JoinAbstractLambdaWrapper.java

@@ -48,10 +48,15 @@ public abstract class JoinAbstractLambdaWrapper<T, Children extends JoinAbstract
      */
     protected String subTableAlias = ConfigProperties.tableAlias;
     /**
-     * 是否构建是否存在一对多
+     * 是否存在对一或对多
      */
     @Getter
     protected boolean resultMap = false;
+    /**
+     * 是否存在一对多
+     */
+    @Getter
+    protected boolean resultMapCollection = false;
     /**
      * 表序号
      */
@@ -469,6 +474,7 @@ public abstract class JoinAbstractLambdaWrapper<T, Children extends JoinAbstract
         super.clear();
         this.alias = ConfigProperties.tableAlias;
         this.resultMap = false;
+        this.resultMapCollection = false;
         this.tableIndex = 1;
         this.dynamicTableName = false;
         this.tableFunc = null;

mybatis-plus-join-core/src/main/java/com/github/yulichang/wrapper/MPJLambdaWrapper.java

@@ -158,7 +158,10 @@ public class MPJLambdaWrapper<T> extends JoinAbstractLambdaWrapper<T, MPJLambdaW
     }
 
     @Override
-    public void addLabel(Label<?> label) {
+    public void addLabel(Label<?> label, boolean isCollection) {
+        if (isCollection) {
+            this.resultMapCollection = true;
+        }
         this.resultMap = true;
         this.resultMapMybatisLabel.add(label);
     }

mybatis-plus-join-core/src/main/java/com/github/yulichang/wrapper/apt/AptAbstractWrapper.java

@@ -56,6 +56,8 @@ public abstract class AptAbstractWrapper<T, Children extends AptAbstractWrapper<
      */
     @Getter
     protected boolean resultMap = false;
+    @Getter
+    protected boolean resultMapCollection = false;
     /**
      * 表序号
      */
@@ -402,6 +404,7 @@ public abstract class AptAbstractWrapper<T, Children extends AptAbstractWrapper<
         super.clear();
         this.alias = ConfigProperties.tableAlias;
         this.resultMap = false;
+        this.resultMapCollection = false;
         this.tableIndex = 1;
         this.dynamicTableName = false;
         this.tableFunc = null;

mybatis-plus-join-core/src/main/java/com/github/yulichang/wrapper/apt/AptQueryWrapper.java

@@ -135,7 +135,10 @@ public class AptQueryWrapper<T> extends AptAbstractWrapper<T, AptQueryWrapper<T>
     }
 
     @Override
-    public void addLabel(Label<?> label) {
+    public void addLabel(Label<?> label, boolean isCollection) {
+        if (isCollection) {
+            this.resultMapCollection = true;
+        }
         this.resultMap = true;
         this.resultMapMybatisLabel.add(label);
     }

mybatis-plus-join-core/src/main/java/com/github/yulichang/wrapper/apt/interfaces/QueryLabel.java

@@ -23,7 +23,7 @@ import java.util.Map;
 @SuppressWarnings({"unchecked", "unused", "DuplicatedCode"})
 public interface QueryLabel<Children> {
 
-    void addLabel(Label<?> label);
+    void addLabel(Label<?> label, boolean isCollection);
 
     Children getChildren();
 
@@ -65,7 +65,7 @@ public interface QueryLabel<Children> {
             Class<Z> ofType = (Class<Z>) genericType;
             builder = new MybatisLabel.Builder<>(dtoFieldName, child, field.getType(), ofType, true);
         }
-        addLabel(builder.build());
+        addLabel(builder.build(), true);
         return getChildren();
     }
 
@@ -108,7 +108,7 @@ public interface QueryLabel<Children> {
         Class<Z> ofType = (Class<Z>) genericType;
         MybatisLabel.Builder<C, Z> builder = new MybatisLabel.Builder<>(dtoFieldName, child, field.getType(), ofType, false);
         MybatisLabel.Builder<C, Z> czBuilder = collection.apply(builder);
-        addLabel(czBuilder.build());
+        addLabel(czBuilder.build(), true);
         return getChildren();
     }
 
@@ -124,7 +124,7 @@ public interface QueryLabel<Children> {
         Class<Z> ofType = (Class<Z>) genericType;
         MybatisLabelFree.Builder<Z> builder = new MybatisLabelFree.Builder<>(dtoFieldName, field.getType(), ofType);
         MybatisLabelFree.Builder<Z> czBuilder = collection.apply(builder);
-        addLabel(czBuilder.build());
+        addLabel(czBuilder.build(), true);
         return getChildren();
     }
 
@@ -142,7 +142,7 @@ public interface QueryLabel<Children> {
         Assert.isFalse(Collection.class.isAssignableFrom(field.getType()), "association 不支持集合类");
         MybatisLabel.Builder<C, F> builder;
         builder = new MybatisLabel.Builder<>(dtoFieldName, child, field.getType(), (Class<F>) field.getType(), true);
-        addLabel(builder.build());
+        addLabel(builder.build(), false);
         return getChildren();
     }
 
@@ -154,7 +154,7 @@ public interface QueryLabel<Children> {
         Assert.isFalse(Collection.class.isAssignableFrom(field.getType()), "association 不支持集合类");
         MybatisLabelFree.Builder<F> builder = new MybatisLabelFree.Builder<>(dtoFieldName, field.getType(), (Class<F>) field.getType());
         MybatisLabelFree.Builder<F> cfBuilder = collection.apply(builder);
-        addLabel(cfBuilder.build());
+        addLabel(cfBuilder.build(), false);
         return getChildren();
     }
 
@@ -166,7 +166,7 @@ public interface QueryLabel<Children> {
         Assert.isFalse(Collection.class.isAssignableFrom(field.getType()), "association 不支持集合类");
         MybatisLabel.Builder<C, F> builder = new MybatisLabel.Builder<>(dtoFieldName, child, field.getType(), (Class<F>) field.getType(), false);
         MybatisLabel.Builder<C, F> cfBuilder = collection.apply(builder);
-        addLabel(cfBuilder.build());
+        addLabel(cfBuilder.build(), false);
         return getChildren();
     }
 }

mybatis-plus-join-core/src/main/java/com/github/yulichang/wrapper/interfaces/Chain.java

@@ -2,6 +2,7 @@ package com.github.yulichang.wrapper.interfaces;
 
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.github.yulichang.interfaces.MPJBaseJoin;
 import com.github.yulichang.toolkit.SqlHelper;
 
@@ -21,8 +22,12 @@ import java.util.Optional;
 @SuppressWarnings("unused")
 public interface Chain<T> extends MPJBaseJoin<T> {
 
+    Page<?> FIRST_PAGE = new Page<>(1, 1).setSearchCount(false);
+
     Class<T> getEntityClass();
 
+    boolean isResultMapCollection();
+
     /**
      * 链式调用 等效于MP mapper的 selectCount()
      * <p>
@@ -63,8 +68,10 @@ public interface Chain<T> extends MPJBaseJoin<T> {
      * new MPJLambdaWrapper(User.class)<br />
      * JoinWrappers.lambda(User.class)<br />
      */
+    @SuppressWarnings("unchecked")
     default T first() {
-        return Optional.of(list()).filter(CollectionUtils::isNotEmpty).map(m -> m.get(0)).orElse(null);
+        List<T> list = this.isResultMapCollection() ? list() : page((Page<T>) FIRST_PAGE).getRecords();
+        return Optional.of(list).filter(CollectionUtils::isNotEmpty).map(m -> m.get(0)).orElse(null);
     }
 
     /**
@@ -74,8 +81,10 @@ public interface Chain<T> extends MPJBaseJoin<T> {
      * new MPJLambdaWrapper(User.class)<br />
      * JoinWrappers.lambda(User.class)<br />
      */
+    @SuppressWarnings("unchecked")
     default <R> R first(Class<R> resultType) {
-        return Optional.of(list(resultType)).filter(CollectionUtils::isNotEmpty).map(m -> m.get(0)).orElse(null);
+        List<R> list = this.isResultMapCollection() ? list(resultType) : page((Page<R>) FIRST_PAGE, resultType).getRecords();
+        return Optional.of(list).filter(CollectionUtils::isNotEmpty).map(m -> m.get(0)).orElse(null);
     }
 
     /**

mybatis-plus-join-core/src/main/java/com/github/yulichang/wrapper/interfaces/QueryLabel.java

@@ -22,7 +22,7 @@ import java.util.Map;
 @SuppressWarnings({"unchecked", "unused", "DuplicatedCode"})
 public interface QueryLabel<Children> {
 
-    void addLabel(Label<?> label);
+    void addLabel(Label<?> label, boolean isCollection);
 
     Children getChildren();
 
@@ -67,7 +67,7 @@ public interface QueryLabel<Children> {
             Class<Z> ofType = (Class<Z>) genericType;
             builder = new MybatisLabel.Builder<>(prefix, dtoFieldName, child, field.getType(), ofType, true);
         }
-        addLabel(builder.build());
+        addLabel(builder.build(), true);
         return getChildren();
     }
 
@@ -116,7 +116,7 @@ public interface QueryLabel<Children> {
         Class<Z> ofType = (Class<Z>) genericType;
         MybatisLabelFree.Builder<Z> builder = new MybatisLabelFree.Builder<>(dtoFieldName, field.getType(), ofType);
         MybatisLabelFree.Builder<Z> czBuilder = collection.apply(builder);
-        addLabel(czBuilder.build());
+        addLabel(czBuilder.build(), true);
         return getChildren();
     }
 
@@ -132,7 +132,7 @@ public interface QueryLabel<Children> {
         Class<Z> ofType = (Class<Z>) genericType;
         MybatisLabel.Builder<C, Z> builder = new MybatisLabel.Builder<>(prefix, dtoFieldName, child, field.getType(), ofType, false);
         MybatisLabel.Builder<C, Z> czBuilder = collection.apply(builder);
-        addLabel(czBuilder.build());
+        addLabel(czBuilder.build(), true);
         return getChildren();
     }
 
@@ -154,7 +154,7 @@ public interface QueryLabel<Children> {
         MybatisLabel.Builder<C, F> builder;
         builder = new MybatisLabel.Builder<>(StringUtils.isBlank(prefix) ? null : prefix,
                 dtoFieldName, child, field.getType(), (Class<F>) field.getType(), true);
-        addLabel(builder.build());
+        addLabel(builder.build(), false);
         return getChildren();
     }
 
@@ -176,7 +176,7 @@ public interface QueryLabel<Children> {
         Assert.isFalse(Collection.class.isAssignableFrom(field.getType()), "association 不支持集合类");
         MybatisLabelFree.Builder<F> builder = new MybatisLabelFree.Builder<>(dtoFieldName, field.getType(), (Class<F>) field.getType());
         MybatisLabelFree.Builder<F> cfBuilder = collection.apply(builder);
-        addLabel(cfBuilder.build());
+        addLabel(cfBuilder.build(), false);
         return getChildren();
     }
 
@@ -189,7 +189,7 @@ public interface QueryLabel<Children> {
         MybatisLabel.Builder<C, F> builder = new MybatisLabel.Builder<>(StringUtils.isBlank(prefix) ? null : prefix,
                 dtoFieldName, child, field.getType(), (Class<F>) field.getType(), false);
         MybatisLabel.Builder<C, F> cfBuilder = collection.apply(builder);
-        addLabel(cfBuilder.build());
+        addLabel(cfBuilder.build(), false);
         return getChildren();
     }
 }

mybatis-plus-join-extension/pom.xml

@@ -33,15 +33,6 @@
         <url>https://github.com/yulichang/mybatis-plus-join</url>
     </scm>
 
-    <properties>
-        <jdkVersion>1.8</jdkVersion>
-        <jdkVersion.test>1.8</jdkVersion.test>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <github.global.server>github</github.global.server>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.github.yulichang</groupId>

mybatis-plus-join-test/test-base/pom.xml

@@ -12,10 +12,4 @@
     <name>test-base</name>
 
     <description>test-base</description>
-
-    <properties>
-        <maven.compiler.source>8</maven.compiler.source>
-        <maven.compiler.target>8</maven.compiler.target>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
 </project>

mybatis-plus-join-test/test-collection/pom.xml

@@ -12,12 +12,6 @@
 
     <artifactId>test-collection</artifactId>
 
-    <properties>
-        <maven.compiler.source>8</maven.compiler.source>
-        <maven.compiler.target>8</maven.compiler.target>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.github.yulichang</groupId>

mybatis-plus-join-test/test-join/pom.xml

@@ -12,12 +12,6 @@
 
     <artifactId>test-join</artifactId>
 
-    <properties>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.github.yulichang</groupId>

mybatis-plus-join-test/test-join/src/test/java/com/github/yulichang/test/join/unit/ChainFirstTest.java

@@ -0,0 +1,46 @@
+package com.github.yulichang.test.join.unit;
+
+import com.github.yulichang.test.join.entity.UserDO;
+import com.github.yulichang.test.util.Reset;
+import com.github.yulichang.toolkit.JoinWrappers;
+import com.github.yulichang.wrapper.MPJLambdaWrapper;
+import com.github.yulichang.wrapper.UpdateJoinWrapper;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+public class ChainFirstTest {
+
+
+    @BeforeEach
+    void setUp() {
+        Reset.reset();
+    }
+
+
+    @Test
+    void chainFirst() {
+        MPJLambdaWrapper<UserDO> wrapper = JoinWrappers.lambda(UserDO.class)
+                .select(UserDO::getName);
+
+        String first = wrapper.first(String.class);
+
+        System.out.println(first);
+    }
+
+    @Test
+    void chainFirst1() {
+        UpdateJoinWrapper<UserDO> update = JoinWrappers.update(UserDO.class)
+                .set(UserDO::getName, null);
+        update.update();
+
+        MPJLambdaWrapper<UserDO> wrapper = JoinWrappers.lambda(UserDO.class)
+                .select(UserDO::getName);
+
+        String first = wrapper.first(String.class);
+
+        System.out.println(first);
+    }
+
+}

mybatis-plus-join-test/test-mapping/pom.xml

@@ -12,12 +12,6 @@
 
     <artifactId>test-mapping</artifactId>
 
-    <properties>
-        <maven.compiler.source>8</maven.compiler.source>
-        <maven.compiler.target>8</maven.compiler.target>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.github.yulichang</groupId>

plugin/mybatis-plus-join-processor/pom.xml

@@ -14,12 +14,6 @@
     <version>${revision}</version>
     <packaging>jar</packaging>
 
-    <properties>
-        <maven.compiler.source>8</maven.compiler.source>
-        <maven.compiler.target>8</maven.compiler.target>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.github.yulichang</groupId>

plugin/mybatis-plus-join-solon-plugin/pom.xml

@@ -14,9 +14,6 @@
 
     <properties>
         <solon.varrsion>2.8.0</solon.varrsion>
-        <maven.compiler.source>8</maven.compiler.source>
-        <maven.compiler.target>8</maven.compiler.target>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
     <dependencies>