EmployeeMapper.xml

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE mapper PUBLIC '-//mybatis.org//DTD ConfigurationModels.Mapper 3.0//EN'
        'http://mybatis.org/dtd/mybatis-3-mapper.dtd'>

<mapper namespace='Homework.MyRosko.EmployeeMapper'>
    <cache
            eviction="FIFO"
            flushInterval="60000"
            size="512"
            readOnly="true"/>
    <select id='getEmployeeById' parameterType='int' resultType='Employee' useCache="true">
        SELECT employee_id   as id,
               email,
               first_name    as firstName,
               last_name     as lastName,
               phone_number  as phoneNumber,
               salary,
               hire_date     as hireDate,
               job_id        as jobId,
               manager_id    as managerId,
               department_id as departmentId
        FROM employees
        WHERE employee_id = #{value}
    </select>

    <resultMap type='Employee' id='EmployeeResult'>
        <id property='id' column='employee_id'/>
        <result property='email' column='email'/>
        <result property='firstName' column='first_name'/>
        <result property='lastName' column='last_name'/>
        <result property='salary' column='salary'/>
        <result property='hireDate' column='hire_date'/>
        <result property='jobId' column='job_id'/>
        <result property='managerId' column='manager_id'/>
        <result property='departmentId' column='department_id'/>
    </resultMap>

    <select id='getAllEmployees' resultMap='EmployeeResult'>
        SELECT *
        FROM employees
    </select>

    <insert id='insertEmployee' parameterType='Employee' useGeneratedKeys='true' keyProperty='id'>
        INSERT INTO employees(first_name, last_name, email, salary, hire_date, job_id, manager_id, department_id)
        VALUES (#{firstName}, #{lastName}, #{email}, #{salary}, #{hireDate}, #{jobId}, #{managerId}, #{departmentId})
    </insert>

    <update id='updateEmployee' parameterType='Employee' flushCache="true">
        UPDATE employees
        SET first_name    = #{firstName},
            last_name     = #{lastName},
            email         = #{email},
            salary        = #{salary},
            hire_date     = #{hireDate},
            job_id        = #{jobId},
            manager_id    = #{managerId},
            department_id = #{departmentId}
        WHERE employee_id = #{id}
    </update>

    <delete id='deleteEmployee' parameterType='int'>
        DELETE
        FROM employees
        WHERE employee_id = #{value}
    </delete>

</mapper>