diff --git a/src/main/resources/mybatis/system/SysConfigMapper.xml b/src/main/resources/mybatis/system/SysConfigMapper.xml
index 7d403db..b2832b1 100644
--- a/src/main/resources/mybatis/system/SysConfigMapper.xml
+++ b/src/main/resources/mybatis/system/SysConfigMapper.xml
@@ -61,7 +61,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
     
     <select id="checkConfigKeyUnique" parameterType="String" resultMap="SysConfigResult">
         <include refid="selectConfigVo"/>
-        where config_key = #{configKey}
+        where config_key = #{configKey} and rownum <= 1
     </select>
     
     <insert id="insertConfig" parameterType="SysConfig">
diff --git a/src/main/resources/mybatis/system/SysDeptMapper.xml b/src/main/resources/mybatis/system/SysDeptMapper.xml
index fe92851..8e4cd2a 100644
--- a/src/main/resources/mybatis/system/SysDeptMapper.xml
+++ b/src/main/resources/mybatis/system/SysDeptMapper.xml
@@ -64,7 +64,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	
 	<select id="hasChildByDeptId" parameterType="Long" resultType="int">
 		select count(1) from sys_dept
-		where del_flag = '0' and parent_id = #{deptId}
+		where del_flag = '0' and parent_id = #{deptId} and rownum <= 1
 	</select>
 	
 	<select id="selectChildrenDeptById" parameterType="Long" resultMap="SysDeptResult">
diff --git a/src/main/resources/mybatis/system/SysDictTypeMapper.xml b/src/main/resources/mybatis/system/SysDictTypeMapper.xml
index 55c114e..9c2ef3e 100644
--- a/src/main/resources/mybatis/system/SysDictTypeMapper.xml
+++ b/src/main/resources/mybatis/system/SysDictTypeMapper.xml
@@ -57,7 +57,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	
 	<select id="checkDictTypeUnique" parameterType="String" resultMap="SysDictTypeResult">
 		<include refid="selectDictTypeVo"/>
-		where dict_type = #{dictType}
+		where dict_type = #{dictType} and rownum <= 1
 	</select>
 	
 	<delete id="deleteDictTypeById" parameterType="Long">
diff --git a/src/main/resources/mybatis/system/SysMenuMapper.xml b/src/main/resources/mybatis/system/SysMenuMapper.xml
index f6c3db4..cc39c71 100644
--- a/src/main/resources/mybatis/system/SysMenuMapper.xml
+++ b/src/main/resources/mybatis/system/SysMenuMapper.xml
@@ -118,7 +118,7 @@
 	
 	<select id="checkMenuNameUnique" parameterType="SysMenu" resultMap="SysMenuResult">
 		<include refid="selectMenuVo"/>
-		where menu_name=#{menuName} and parent_id = #{parentId}
+		where menu_name=#{menuName} and parent_id = #{parentId} and rownum <= 1
 	</select>
 	
 	<update id="updateMenu" parameterType="SysMenu">
diff --git a/src/main/resources/mybatis/system/SysPostMapper.xml b/src/main/resources/mybatis/system/SysPostMapper.xml
index d745602..4bdbd03 100644
--- a/src/main/resources/mybatis/system/SysPostMapper.xml
+++ b/src/main/resources/mybatis/system/SysPostMapper.xml
@@ -64,12 +64,12 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	
 	<select id="checkPostNameUnique" parameterType="String" resultMap="SysPostResult">
 		<include refid="selectPostVo"/>
-		 where post_name=#{postName}
+		 where post_name=#{postName} and rownum <= 1
 	</select>
 	
 	<select id="checkPostCodeUnique" parameterType="String" resultMap="SysPostResult">
 		<include refid="selectPostVo"/>
-		 where post_code=#{postCode}
+		 where post_code=#{postCode} and rownum <= 1
 	</select>
 	
 	<update id="updatePost" parameterType="SysPost">
diff --git a/src/main/resources/mybatis/system/SysRoleMapper.xml b/src/main/resources/mybatis/system/SysRoleMapper.xml
index 085b5be..4159ee0 100644
--- a/src/main/resources/mybatis/system/SysRoleMapper.xml
+++ b/src/main/resources/mybatis/system/SysRoleMapper.xml
@@ -80,12 +80,12 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	
 	<select id="checkRoleNameUnique" parameterType="String" resultMap="SysRoleResult">
 		<include refid="selectRoleVo"/>
-		 where r.role_name=#{roleName}
+		 where r.role_name=#{roleName} and rownum <= 1
 	</select>
 	
 	<select id="checkRoleKeyUnique" parameterType="String" resultMap="SysRoleResult">
 		<include refid="selectRoleVo"/>
-		 where r.role_key=#{roleKey}
+		 where r.role_key=#{roleKey} and rownum <= 1
 	</select>
 	
  	<insert id="insertRole" parameterType="SysRole" useGeneratedKeys="true" keyProperty="roleId">
diff --git a/src/main/resources/mybatis/system/SysRoleMenuMapper.xml b/src/main/resources/mybatis/system/SysRoleMenuMapper.xml
index b8dd573..8244da5 100644
--- a/src/main/resources/mybatis/system/SysRoleMenuMapper.xml
+++ b/src/main/resources/mybatis/system/SysRoleMenuMapper.xml
@@ -10,7 +10,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	</resultMap>
 	
 	<select id="checkMenuExistRole" resultType="Integer">
-	    select count(1) from sys_role_menu where menu_id = #{menuId}  
+	    select count(1) from sys_role_menu where menu_id = #{menuId}
 	</select>
 
 	<delete id="deleteRoleMenuByRoleId" parameterType="Long">
diff --git a/src/main/resources/mybatis/system/SysUserMapper.xml b/src/main/resources/mybatis/system/SysUserMapper.xml
index e95d0c5..ff99029 100644
--- a/src/main/resources/mybatis/system/SysUserMapper.xml
+++ b/src/main/resources/mybatis/system/SysUserMapper.xml
@@ -92,15 +92,15 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	</select>
 	
 	<select id="checkUserNameUnique" parameterType="String" resultType="int">
-		select count(1) from sys_user where user_name = #{userName}
+		select count(1) from sys_user where user_name = #{userName} and rownum <= 1
 	</select>
 	
 	<select id="checkPhoneUnique" parameterType="String" resultMap="SysUserResult">
-		select user_id, phonenumber from sys_user where phonenumber = #{phonenumber}
+		select user_id, phonenumber from sys_user where phonenumber = #{phonenumber} and rownum <= 1
 	</select>
 	
 	<select id="checkEmailUnique" parameterType="String" resultMap="SysUserResult">
-		select user_id, email from sys_user where email = #{email}
+		select user_id, email from sys_user where email = #{email} and rownum <= 1
 	</select>
 	
 	<insert id="insertUser" parameterType="SysUser" useGeneratedKeys="true" keyProperty="userId">