通過SpringIOC技術， 實現資料庫的增刪改查

1.SpringJDBC

@Transactional
public class StudentDAOImpl implements StudentDAO {

    /**
     * 依賴注入
     * Spring 提供的 jdbc模板，操作資料表CRUD
     */
    private JdbcTemplate jdbcTemplate;
    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }
    //DAO實現層的操作程式碼
    @Transactional(propagation=Propagation.REQUIRED,readOnly=false)
    @Override
    public int saveStudent(Student student) {
        //DBUtil   
        int count = this.jdbcTemplate.update(
                "insert into T_STUDENT (STUNAME) VALUES (?)",
                new Object[]{student.getStuName()});
        return count;
    }


    @Transactional(propagation=Propagation.NOT_SUPPORTED,readOnly=true)
    @Override
    public Student getStudentById(Integer id) {

        return (Student) this.jdbcTemplate.queryForObject(
                "select * from T_STUDENT where stuid = ?",
                new Object[]{id},
                new StudentRowMapper());


    }
    //處理器
    class StudentRowMapper implements RowMapper{
        @Override
        public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
            Student student = new Student();

            //把Student結果集裡面的資料複製給   Student物件
            student.setStuId(rs.getInt("stuid"));
            student.setStuName(rs.getString("stuname"));

            return student;
        }


    }

}
 

2.Spring提供jdbc模板配置 （本次使用的是Oracle資料來源）

    <!-- Spring提供  jdbc模板 -->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="oraclDataSource"></property>   
    </bean> 

3.配置dbcp資料來源 模板配置

    <!-- 配置Oracle的dbcp資料來源 -->
    <bean id="oraclDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
        <!-- &amp; 轉義字元 其實就是代表一個& -->
        <property name="url"  value="jdbc:oracle:thin:@127.0.0.1:1521:orcl"/>
        <property name="username" value="scott"/>
        <property name="password" value="tiger"/>
    </bean>


    <!-- 配置mySQLd的dbcp資料來源 -->
    <bean id="mySqlDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <!-- &amp; 轉義字元 其實就是代表一個& -->
        <property name="url"  value="jdbc:mysql://localhost:3306/sxt"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>	
 

4.依賴注入給DAOImpl實現層

    <!--DAO交給Spring管理 StudentDAOImpl     -->
    <bean id="studentDAOImpl" class="cn.springjdbc.dao.impl.StudentDAOImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>