1.Spring-mybatis-动态SQL-if&where&set标签

springboot-mybatis-crud/src/main/java/com/inmind/mapper/EmpMapper.java

@@ -28,8 +28,8 @@ public interface EmpMapper {
     public void insert(Emp emp);
 
     //更新员工
-    @Update("update emp set username = #{username}, name = #{name}, gender = #{gender}, image = #{image}, job = #{job}" +
-            ", entrydate = #{entrydate}, dept_id = #{deptId},update_time = #{updateTime} where id = #{id}")
+    /*@Update("update emp set username = #{username}, name = #{name}, gender = #{gender}, image = #{image}, job = #{job}" +
+            ", entrydate = #{entrydate}, dept_id = #{deptId},update_time = #{updateTime} where id = #{id}")*/
     public void update(Emp emp);
 
 

springboot-mybatis-crud/src/main/resources/com/inmind/mapper/EmpMapper.xml

@@ -3,9 +3,54 @@
         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="com.inmind.mapper.EmpMapper">
+
     <!--条件查询操作-->
     <select id="list" resultType="com.inmind.pojo.Emp">
-        select * from emp where name like concat('%',#{name},'%')
-        and gender = #{gender} and entrydate between #{begin} and #{end} order by update_time desc
+        select * from emp
+        <where>
+            <if test="name != null">
+                name like concat('%',#{name},'%')
+            </if>
+            <if test="gender != null">
+                and gender = #{gender}
+            </if>
+            <if test="begin != null and end != null">
+                and entrydate between #{begin} and #{end}
+            </if>
+        </where>
+        order by update_time desc
     </select>
+
+    <!--动态更新员工信息-->
+    <update id="update">
+        update emp
+        <set>
+            <if test=" username != null">
+                username = #{username},
+            </if>
+            <if test="name != null">
+                name = #{name},
+            </if>
+            <if test="gender != null">
+                gender = #{gender},
+            </if>
+            <if test="image != null">
+                image = #{image},
+            </if>
+            <if test="job != null">
+                job = #{job},
+            </if>
+            <if test="entrydate != null">
+                entrydate = #{entrydate},
+            </if>
+            <if test="deptId != null">
+                dept_id = #{deptId},
+            </if>
+            <if test="updateTime != null">
+                update_time = #{updateTime}
+            </if>
+        </set>
+
+        where id = #{id}
+    </update>
 </mapper>

springboot-mybatis-crud/src/test/java/com/inmind/SpringbootMybatisCrudApplicationTests.java

@@ -71,4 +71,23 @@ class SpringbootMybatisCrudApplicationTests {
         List<Emp> list = empMapper.list("张", (short) 1, LocalDate.of(2010, 1, 1), LocalDate.of(2020, 1, 1));
         System.out.println(list);
     }
+
+    //条件查询测试
+    @Test
+    void testList1(){
+//        List<Emp> list = empMapper.list("张", null, null,null);
+        List<Emp> list = empMapper.list(null, (short)1, null,null);
+        System.out.println(list);
+    }
+
+    @Test
+    void testUpdate1(){
+        Emp emp = new Emp();
+        emp.setId(20);
+        emp.setGender((short)1);
+        emp.setUsername("ls6");
+        emp.setName("李四6");
+        emp.setUpdateTime(LocalDateTime.now());
+        empMapper.update(emp);
+    }
 }