diff --git a/common/pom.xml b/common/pom.xml
index 58601bd..15b455b 100644
--- a/common/pom.xml
+++ b/common/pom.xml
@@ -17,4 +17,10 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.baomidou</groupId>
+            <artifactId>mybatis-plus-boot-starter</artifactId>
+        </dependency>
+    </dependencies>
 </project>
diff --git a/common/src/main/java/net/rzdata/demo/domain/Id.java b/common/src/main/java/net/rzdata/demo/domain/Id.java
new file mode 100644
index 0000000..8006ce3
--- /dev/null
+++ b/common/src/main/java/net/rzdata/demo/domain/Id.java
@@ -0,0 +1,8 @@
+package net.rzdata.demo.domain;
+
+public record Id(String id) {
+
+    public static Id of(String id) {
+        return new Id(id);
+    }
+}
diff --git a/common/src/main/java/net/rzdata/demo/trait/BaseRepository.java b/common/src/main/java/net/rzdata/demo/trait/BaseRepository.java
new file mode 100644
index 0000000..6ef7c4b
--- /dev/null
+++ b/common/src/main/java/net/rzdata/demo/trait/BaseRepository.java
@@ -0,0 +1,16 @@
+package net.rzdata.demo.trait;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+
+public abstract class BaseRepository<T, M extends BaseMapper<T>> {
+
+    private final transient M mapper;
+
+    public BaseRepository(M mapper) {
+        this.mapper = mapper;
+    }
+
+    public M get() {
+        return this.mapper;
+    }
+}
diff --git a/common/src/main/java/net/rzdata/demo/trait/IConverter.java b/common/src/main/java/net/rzdata/demo/trait/IConverter.java
new file mode 100644
index 0000000..7afe46f
--- /dev/null
+++ b/common/src/main/java/net/rzdata/demo/trait/IConverter.java
@@ -0,0 +1,11 @@
+package net.rzdata.demo.trait;
+
+/**
+ * 实体转换类
+ * @param <S> 源类型
+ * @param <T> 目标类型
+ */
+public interface IConverter<S, T> {
+
+    T convert(S source);
+}
diff --git a/common/src/main/java/net/rzdata/demo/trait/IQuery.java b/common/src/main/java/net/rzdata/demo/trait/IQuery.java
new file mode 100644
index 0000000..faa8344
--- /dev/null
+++ b/common/src/main/java/net/rzdata/demo/trait/IQuery.java
@@ -0,0 +1,10 @@
+package net.rzdata.demo.trait;
+
+/**
+ * 请求实体类
+ * @param <T> 核心模型类型
+ */
+public interface IQuery<T> {
+
+    T into();
+}