Lists in the MyBatis 'IN' Section

Question

How to pass an Integer List to MyBatis XML, which will be used in the in clause in my MySQL query?

I am using Java 7, MySQL 5.6 DB and MyBatis 3.0.4 with queries in a file mapper-xml.

I am currently converting this list of integers to a string and using string substitution ( ${}operator) to put the values ​​in the "IN" clause - while it works as expected, this approach leaves the Injection parameter vulnerable.

I tried to use the element <foreach>, but I cannot determine which attributes to specify.

The following is sample Java code:

public List<Stripper> getStripperDetails(String club, List<Integer> stripperIds) {
        Map<String, Object> input = new HashMap<>();
        input.put("club", club);
        input.put("stripperIds", stripperIds);
        return stripClubMapper.getStripperDetails(input);
}

Mapper xml:

<select id="getStripperDetails" parameterType="java.util.HashMap" resultMap="StripperMap">
    SELECT STRIPPER_ID, STAGE_NAME, REAL_NAME, CLUB FROM EXOTIC_DANCERS WHERE CLUB = #{club} AND STRIPPER_ID IN     
    <foreach item="item" index="index" collection="stripperIds" open="(" separator="," close=")">
        #{index}
    </foreach>
</select>

I can’t determine which attributes to specify for the element <foreach>- I continue to work in NullPointerException for the value in # {index}.

<foreach>?

:

@10086,

:

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: java.lang.NullPointerException
### The error may involve com.stripclub.mapper.stripClubMapper.getStripperDetails-Inline
### The error occurred while setting parameters
### Cause: java.lang.NullPointerException
    at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:67) ~[mybatis-spring-1.0.0-RC3.jar:1.0.0-RC3]
    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:345) ~[mybatis-spring-1.0.0-RC3.jar:1.0.0-RC3]
    at com.sun.proxy.$Proxy208.selectList(Unknown Source) ~[na:na]
    at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:193) ~[mybatis-spring-1.0.0-RC3.jar:1.0.0-RC3]
    at org.apache.ibatis.binding.MapperMethod.executeForList(MapperMethod.java:85) ~[mybatis-3.0.4.jar:3.0.4]
    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:65) ~[mybatis-3.0.4.jar:3.0.4]
    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:38) ~[mybatis-3.0.4.jar:3.0.4]
    at com.sun.proxy.$Proxy209.getTransactionIds(Unknown Source) ~[na:na]

Answer 1

, item, foreach . , :

    <foreach item="sId" collection="stripperIds" separator="," open="(" close=")">
        #{sId}
    </foreach>

. " MyBatis" DTD - http://mybatis.org/dtd/mybatis-3-mapper.dtd :

    <!ELEMENT foreach (#PCDATA | include | trim | where | set | foreach | choose | if | bind)*>
    <!ATTLIST foreach
    collection CDATA #REQUIRED
    item CDATA #IMPLIED
    index CDATA #IMPLIED
    open CDATA #IMPLIED
    close CDATA #IMPLIED
    separator CDATA #IMPLIED
    >

, foreach, . INSERT/UPDATE:

bean:

public class StripperBean {

    public StripperBean(int stripperID, String stripperName, String realName) {
        this.stripperID = stripperID;
        this.stripperName = stripperName;
        this.realName = realName;
    }

    private int stripperID; 
    private String stripperName;
    private String realName;        

    public int getStripperID() {
        return stripperID;
    }
    public void setStripperID(int stripperID) {
        this.stripperID = stripperID;
    }
    public String getStripperName() {
        return stripperName;
    }
    public void setStripperName(String stripperName) {
        this.stripperName = stripperName;
    }
    public String getRealName() {
        return realName;
    }
    public void setRealName(String realName) {
        this.realName = realName;
    }       
}

:

    Map<String, Object> input = new HashMap<>();
    input.put("club", club);
    List<StripperBean> strippers = new ArrayList<>();
    strippers.add(new StripperBean(1,"Ashley", "Jean Grey"));
    strippers.add(new StripperBean(2,"Candice","Diana Prince"));
    strippers.add(new StripperBean(3,"Cristal","Lara Croft"));        
    input.put("strippers", strippers);
    return stripClubMapper.saveStripperDetails(input);

mapper xml:

    <insert id="saveStripperDetails">
        INSERT INTO EXOTIC_DANCERS (STRIPPER_ID, STAGE_NAME, REAL_NAME)
        VALUES
        <foreach item="stripper" collection="input" separator=",">
            (#{stripper.stripperID},
            #{stripper.stripperName},
            #{stripper.realName})
        </foreach>
    </select>

BTW:)

Answer 2

xml :

<foreach item="item" index="index" collection="stripperIds" open="(" separator="," close=")">
    #{item}
</foreach>

Map ( Collection of Map.Entry) , item value.

. .

Answer 3

@Select({
        "<script>", "select", " * ", "FROM TABLE",
        "WHERE  CONDITION IN  " +
        "<foreach item='item' index='index' collection='list' open='(' separator=',' close=')'> #{item} </foreach>" +
        "</script>"  })
         @Results({ })
        List<POJO> selectByKeys(@Param("list") List<String> ids);

Answer 4

- . stripperIds stripperIds.