Mybatis-Error setting null parameter

Question

I used mybatis-spring-1.0.3-SNAPSHOT mybatis-3.0.6 spring3.0.6.I tried to delete record from a table like this:

Answer 1

OK I see a few problems. First, when setting a null parameter into a Prepared Statement or a Callable Statement MyBatis needs to know the jdbc type. Like this,

#{myNullParamenter, jdbcType=VARCHAR}

You're also generating your 'in clause incorrectly. You need to use the foreach tag to only generate list of the values. Move the "ID IN" part out of the foreach tag.

<if test="ids !=null and ids.length > 0">
    ID IN
    <foreach collection="ids" item="id" open="(" close=")" separator=",">
        #{id}
    </foreach>
</if>

I would also recommend against using HashMaps. The new Mapper classes are much better.

Answer 2

The problem is that since the 3.0.x versions the default JDBC type for null parameters is Types.OTHER which not supported by some JDBC drivers like Oracle 10g.

Here a post that explain this issue.

The solution I found is very simple, I set jdbcTypeForNull to NULL in the configuration file.

<configuration>
    <properties resource="mybatis-config.properties" />
    <settings>
        <setting name="jdbcTypeForNull" value="NULL" />
    </settings>

    <environments default="development">
    ....
    </environments>

    <mappers>
    ....
   </mappers>
</configuration>