mybatis中写sql语句的注意事项--instr

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instr:
<select id="selectedPresonid" parameterType="java.lang.String"         resultType="gds.common.employee.dto.EmployeeDTO">
       SELECT DEPID,DEPNAME,EMPLOYEEID,EMPLOYEENAME FROM
            FW_EMPLOYEE,FW_DEPARTMENT
            WHERE FW_EMPLOYEE.WORKDEPID=FW_DEPARTMENT.DEPID
            AND INSTR(#{viewPersonID},EMPLOYEEID)>0

    </select>

not instr:

<select id="selectedAllDepid" parameterType="gds.common.employee.dto.EmployeeDTO"
resultType="gds.common.employee.dto.EmployeeDTO">
         SELECT DEPID,DEPNAME,EMPLOYEEID,EMPLOYEENAME FROM FW_EMPLOYEE
        A,FW_DEPARTMENT B
         WHERE A.WORKDEPID=B.DEPID
           AND B.DEPID=#{depID}
         <if test="workDepID!=null and ''!=workDepID">
                 AND NOT INSTR(#{workDepID},EMPLOYEEID)>0
        </if>
</select>