myBatis-智能标签

<!--查询姓名中包含“雨”，并且年龄>20的学生信息-->  
ublic  List<StudentInfo> findStudentsByCondition(Map<String,Object> map);  
[java] view plain copy
<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_2_2638930" name="code" class="java"><!--多条件查询-->  
    <select id="findStudentsByCondition" resultType="StudentInfo">  
         select * from  studentinfo where stuname like '%' #{stuName} '%' and stuAge>#{stuAge}  
    </select></pre><br>  
<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_3_305399" name="code" class="java">多条件查询  
    @Test  
    public void testSelectLike(){  
        SqlSession session= MyBatisUtil.getSession();  
        IStudentInfoDAO dao = session.getMapper(IStudentInfoDAO.class);  
        Map<String,Object> map=new HashMap<String,Object>();  
        map.put("stuName","雨");  
        map.put("stuAge",20);  
        List<StudentInfo> list = dao.findStudentsByCondition(map);  
        for (StudentInfo stu:list) {  
            System.out.println(stu.getStuName());  
        }  
        session.close();  
    }  
  
  
  
}  
</pre><br>  



<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_4_4907205" name="code" class="java"><!--查询姓名中包含“雨”，并且年龄>20的学生信息-->  
    public  List<StudentInfo> findStudentsByConditionMutliArgs(String stuName,int stuAge);</pre><pre code_snippet_id="2480216" snippet_file_name="blog_20170712_5_1145214" name="code" class="java"><!--多条件查询使用索引-->  
    <select id="findStudentsByConditionMutliArgs" resultType="StudentInfo">  
        select * from  studentinfo where stuname like '%' #{0} '%' and stuAge>#{1}  
    </select></pre><br>  
<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_6_7175479" name="code" class="java">//多条件查询  
    @Test  
    public void testSelectLikeMulti(){  
        SqlSession session= MyBatisUtil.getSession();  
        IStudentInfoDAO dao = session.getMapper(IStudentInfoDAO.class);  
  
        List<StudentInfo> list = dao.findStudentsByConditionMutliArgs("雨",20);  
        for (StudentInfo stu:list) {  
            System.out.println(stu.getStuName());  
        }  
        session.close();  
    }</pre><br>  



<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_7_6793795" name="code" class="java">//智能标签if  
    public List<StudentInfo> findByIf(StudentInfo stu);</pre><pre code_snippet_id="2480216" snippet_file_name="blog_20170712_8_8048314" name="code" class="java"></pre><pre code_snippet_id="2480216" snippet_file_name="blog_20170712_9_7666630" name="code" class="java"><!--智能标签if-->  
    <select id="findByIf" resultType="StudentInfo">  
        select * from studentinfo  
        <where>  
            <if test="stuName!=null"><!--用户录入的姓名字段-->  
                 and stuName like '%' #{stuName} '%'  
            </if>  
            <if test="stuAge!=null">  
                and stuAge>#{stuAge}  
            </if>  
        </where>  
    </select></pre><br>

  
<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_10_8888129" name="code" class="java">//智能标签if  
    @Test  
    public void testIf(){  
        SqlSession session= MyBatisUtil.getSession();  
        IStudentInfoDAO dao = session.getMapper(IStudentInfoDAO.class);  
        StudentInfo stu=new StudentInfo();  
       // stu.setStuName("雨");  
       stu.setStuAge(20);  
        List<StudentInfo> list = dao.findByIf(stu);  
        for (StudentInfo stuinfo:list) {  
  
            System.out.println(stuinfo.getStuName());  
        }  
        session.close();  
    }  
</pre><br> 

 
<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_11_458294" name="code" class="java">//智能标签choose  
    public List<StudentInfo> findByChoose(StudentInfo stu);</pre><br>  
<br>  



<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_12_8124761" name="code" class="java"><!--智能标签choose-->  
    <select id="findByChoose" resultType="StudentInfo">  
        select * from studentinfo  
        <where>  
            <choose>  
                <when test="stuName!=null">  
                    and stuName like '%' #{stuName} '%'  
                </when>  
                <when test="stuAge!=null">  
                    and stuAge>#{stuAge}  
                </when>  
                <otherwise>  
                     and 1=2  
                </otherwise>  
            </choose>  
        </where>  
    </select></pre><br>  


<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_13_6314618" name="code" class="java">//智能标签choose  
    @Test  
    public void testChoose(){  
        SqlSession session= MyBatisUtil.getSession();  
        IStudentInfoDAO dao = session.getMapper(IStudentInfoDAO.class);  
        StudentInfo stu=new StudentInfo();  
        // stu.setStuName("雨");  
       // stu.setStuAge(20);  
        List<StudentInfo> list = dao.findByChoose(stu);  
        for (StudentInfo stuinfo:list) {  
  
            System.out.println(stuinfo.getStuName());  
        }  
        session.close();  
    }</pre>



<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_14_5932934" name="code" class="java">//智能标签foreach  
    public  List<StudentInfo> findByForeachArray(int[] ids);</pre><pre code_snippet_id="2480216" snippet_file_name="blog_20170712_15_2727351" name="code" class="java"><!--智能标签foreach Array-->  
    <select id="findByForeachArray" resultType="StudentInfo">  
        select * from studentinfo  
        <where>  
            <if test="array.length>0">  
                stuid in  
                <foreach collection="array" open="(" close=")" separator="," item="stuno">  
                    #{stuno}  
                </foreach>  
            </if>  
        </where>  
    </select></pre><pre code_snippet_id="2480216" snippet_file_name="blog_20170712_16_2345667" name="code" class="java">//智能标签Foreach array  
    @Test  
    public void testForeachArray(){  
        SqlSession session= MyBatisUtil.getSession();  
        IStudentInfoDAO dao = session.getMapper(IStudentInfoDAO.class);  
        int[] ids={2,5};  
        List<StudentInfo> list = dao.findByForeachArray(ids);  
        for (StudentInfo stuinfo:list) {  
  
            System.out.println(stuinfo.getStuName());  
        }  
        session.close();  
    }  




</pre><pre code_snippet_id="2480216" snippet_file_name="blog_20170712_17_1963983" name="code" class="java">//智能标签foreach List<Integer>  
    public  List<StudentInfo> findByForeachList(List<Integer> list);</pre><pre code_snippet_id="2480216" snippet_file_name="blog_20170712_21_5279816" name="code" class="java"> <!--智能标签foreach List-->  
    <select id="findByForeachListStudent" resultType="StudentInfo">  
        select * from studentinfo  
        <where>  
            <if test="list.size>0">  
                stuid in  
                <foreach collection="list" open="(" close=")" separator="," item="stu">  
                    #{stu.stuId}  
                </foreach>  
            </if>  
        </where>  
    </select></pre><pre code_snippet_id="2480216" snippet_file_name="blog_20170712_19_9423490" name="code" class="java">//智能标签Foreach List<StudentInfo>  
    @Test  
    public void testForeachListStudent(){  
        SqlSession session= MyBatisUtil.getSession();  
        IStudentInfoDAO dao = session.getMapper(IStudentInfoDAO.class);  
        List<StudentInfo> list=new ArrayList<StudentInfo>();  
        StudentInfo s1=new StudentInfo();  
        s1.setStuId(2);  
        StudentInfo s2=new StudentInfo();  
        s2.setStuId(5);  
        list.add(s1);  
        list.add(s2);  
        List<StudentInfo> list2 = dao.findByForeachListStudent(list);  
        for (StudentInfo stuinfo:list2) {  
  
            System.out.println(stuinfo.getStuName());  
        }  
        session.close();  
    }</pre><br> 


 

<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_20_7089959" name="code" class="java">//智能标签foreach List<StudentInfo>  
    public  List<StudentInfo> findByForeachListStudent(List<StudentInfo> list);  
}  
</pre><br>  


<pre code_snippet_id="2480216" snippet_file_name="blog_20170712_21_5279816" name="code" class="java"> <!--智能标签foreach List-->  
    <select id="findByForeachListStudent" resultType="StudentInfo">  
        select * from studentinfo  
        <where>  
            <if test="list.size>0">  
                stuid in  
                <foreach collection="list" open="(" close=")" separator="," item="stu">  
                    #{stu.stuId}  
                </foreach>  
            </if>  
        </where>  
    </select></pre><pre code_snippet_id="2480216" snippet_file_name="blog_20170712_22_2389877" name="code" class="java">    //.智能标签Foreach List<StudentInfo>  
    @Test  
    public void testForeachListStudent(){  
        SqlSession session= MyBatisUtil.getSession();  
        IStudentInfoDAO dao = session.getMapper(IStudentInfoDAO.class);  
        List<StudentInfo> list=new ArrayList<StudentInfo>();  
        StudentInfo s1=new StudentInfo();  
        s1.setStuId(2);  
        StudentInfo s2=new StudentInfo();  
        s2.setStuId(5);  
        list.add(s1);  
        list.add(s2);  
        List<StudentInfo> list2 = dao.findByForeachListStudent(list);  
        for (StudentInfo stuinfo:list2) {  
  
            System.out.println(stuinfo.getStuName());  
        }  
        session.close();  
    }</pre><br>  


智能标签if set

<update id="modify">
    UPDATE studentinfo
    <set>
        <if test="stuName!=null">stuName=#{stuName},</if>
        <if test="stuAge!=null">stuAge=#{stuAge},</if>
    </set>
    WHERE stuId=#{stuId}
</update>

智能标签 if trim 更新操作

<update id="mod" parameterType="StudentInfo">
    UPDATE studentinfo
    <trim prefix="set" suffixOverrides="," suffix="where stuId=#{stuId}">
        <if test="stuName!=null">stuName=#{stuName},</if>
        <if test="stuAge!=null">stuAge=#{stuAge},</if>
    </trim>
</update>