MyBatis - returning empty value when IN operator is used - ibatis

Question

I have a query like below,
<select id="getTableName" resultType="java.lang.String" parameterType="java.lang.String">
Select Distinct TableName From TABLE_COLUMN_MAPPING Where COLUMNNAME IN (#{columnNames})
</select>
am calling the service method by passing the values as below.
sampleService.getTableName("'BANKRM','APPLICANTID','APPLICANTTYPE','APPLICANTTYPE','TOTAL','SCQUES9'");
but its returning... [ ]
Help me why am not getting values instead am getting empty List.
P.S: I checked the log and its statements are created with out any issues
2013-03-22 19:16:27,521 DEBUG [main] org.apache.ibatis.datasource.pooled.PooledDataSource (debug:27) - Created connection 23845098.
2013-03-22 19:16:27,590 DEBUG [main] java.sql.Connection (debug:27) - ooo Connection Opened
2013-03-22 19:16:27,670 DEBUG [main] java.sql.PreparedStatement (debug:27) - ==> Executing: Select Distinct TableName From Config_FieldDetails Where COLUMNNAME IN (?)
2013-03-22 19:16:27,670 DEBUG [main] java.sql.PreparedStatement (debug:27) - ==> Parameters: 'BANKRM','APPLICANTID','APPLICANTTYPE','APPLICANTTYPE','TOTAL','SCQUES9'(String)
2013-03-22 19:16:27,954 DEBUG [main] java.sql.Connection (debug:27) - xxx Connection Closed
2013-03-22 19:16:27,955 DEBUG [main] org.apache.ibatis.datasource.pooled.PooledDataSource (debug:27) - Returned connection 23845098 to pool.
2013-03-22 19:16:27,955 INFO [main] com.hcl.cob.mybatis.bpm.service.impl.COBBPMCommonServiceImpl (getTableNameFromConfigFieldDetails:41) - getTableNameFromConfigFieldDetails(String columnName) -- End

Answer 1

Put the list of column names in one List parameter and then pass that to the query:
List<String> columnNames = Arrays.asList(["BANKRM", "APPLICANTID", "APPLICANTTYPE", "APPLICANTTYPE","TOTAL","SCQUES9"]);
sampleService.getTableName(columnNames);
Then update the query to take a list and use the foreach tag to iterate over the list values and put them in the in clause:
<select id="getTableName" resultType="java.lang.String" parameterType="java.util.List">
Select Distinct TableName From TABLE_COLUMN_MAPPING Where COLUMNNAME IN
<foreach item="columnName" index="index" collection="columnNames" open="(" separator="," close=")">
#{columnName}
</foreach>
</select>

Answer 2

If you want to put parameter which will be used to create PreparedStatement (not to pass parameter), you should use ${} notation:
${columnNames}