深入浅出JDBC-操作时间与大对象(Clob/Blob)

一、时间(Date、Time、Timestamp)

　　java.sql.Date/java.sql.Time/java.sql.Timestamp extends java.util.Date

public class TimeData {

    PreparedStatement pStatement=null;

    //操作日期类型的数据

    public void insertDate(Connection connection,long time){

        try {

            String sql="insert into user(regTime)values(?)";

            pStatement=connection.prepareStatement(sql);

            //插入的时间为当前日期

            pStatement.setDate(1,new Date(time));

            pStatement.executeUpdate();

        }catch (Exception e){

            e.printStackTrace();

        }finally {

            DBUtil.getInstance().close(pStatement);

            DBUtil.getInstance().close(connection);

        }

    }
</span><span style="color: #008000;">//</span><span style="color: #008000;">操作时间类型的数据</span>

<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> insertTimestamp(Connection connection,<span style="color: #0000ff;">long</span><span style="color: #000000;"> time){

    </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {

        String sql</span>="insert into user(loginTime)values(?)"<span style="color: #000000;">;

        pStatement</span>=<span style="color: #000000;">connection.prepareStatement(sql);

        java.sql.Timestamp timestamp</span>=<span style="color: #0000ff;">new</span><span style="color: #000000;"> java.sql.Timestamp(time);

        </span><span style="color: #008000;">//</span><span style="color: #008000;">插入的时间为当前时间</span>

        pStatement.setTimestamp(1<span style="color: #000000;">,timestamp);

        pStatement.executeUpdate();

    }</span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (Exception e){

        e.printStackTrace();

    }</span><span style="color: #0000ff;">finally</span><span style="color: #000000;"> {

        DBUtil.getInstance().close(pStatement);

        DBUtil.getInstance().close(connection);

    }

}

</span><span style="color: #008000;">/**</span><span style="color: #008000;">

 *批量添加某一区间的数据

 * </span><span style="color: #808080;">@param</span><span style="color: #008000;"> connection

 * </span><span style="color: #808080;">@param</span><span style="color: #008000;"> first 注册时间

 * </span><span style="color: #808080;">@param</span><span style="color: #008000;"> seconed  登录时间

 * </span><span style="color: #808080;">@param</span><span style="color: #008000;"> rowNum 添加的记录的条数

 </span><span style="color: #008000;">*/</span>

<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> insertBatch(Connection connection,<span style="color: #0000ff;">long</span> first,<span style="color: #0000ff;">long</span> seconed,<span style="color: #0000ff;">int</span><span style="color: #000000;"> rowNum){

    </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {

        String sql</span>="insert into user(regTime,loginTime) values(?,?)"<span style="color: #000000;">;

        pStatement</span>=<span style="color: #000000;">connection.prepareStatement(sql);

        </span><span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> i=0;i&lt;rowNum;i++<span style="color: #000000;">){

            </span><span style="color: #0000ff;">long</span> regTime=<span style="color: #0000ff;">new</span> Random().nextInt(100000000)+<span style="color: #000000;">first;

            </span><span style="color: #0000ff;">long</span> loginTime=seconed-<span style="color: #0000ff;">new</span> Random().nextInt(10000000<span style="color: #000000;">);

            pStatement.setDate(</span>1,<span style="color: #0000ff;">new</span><span style="color: #000000;"> java.sql.Date(regTime));

            pStatement.setTimestamp(</span>2,<span style="color: #0000ff;">new</span><span style="color: #000000;"> Timestamp(loginTime));

            pStatement.executeUpdate();

        }

    }</span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (Exception e){

        e.printStackTrace();

    }</span><span style="color: #0000ff;">finally</span><span style="color: #000000;"> {

        DBUtil.getInstance().close(pStatement);

        DBUtil.getInstance().close(connection);

    }

}

</span><span style="color: #008000;">//</span><span style="color: #008000;">插入指定时间的数据</span>

<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">long</span><span style="color: #000000;"> StringToDate(String dateString){

    </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {

        SimpleDateFormat sdf</span>=<span style="color: #0000ff;">new</span> SimpleDateFormat("yyyy-MM-dd hh:mm:ss"<span style="color: #000000;">);

        </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> sdf.parse(dateString).getTime();

    } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (ParseException e) {

        e.printStackTrace();

    }

    </span><span style="color: #0000ff;">return</span> 0<span style="color: #000000;">;

}

</span><span style="color: #008000;">//</span><span style="color: #008000;">查询日期、时间</span>

<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> query(Connection connection){

    Statement statement</span>=<span style="color: #0000ff;">null</span><span style="color: #000000;">;

    ResultSet rs</span>=<span style="color: #0000ff;">null</span><span style="color: #000000;">;

    </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {

        statement</span>=<span style="color: #000000;">connection.createStatement();

        String sql</span>="select regTime,loginTime from user"<span style="color: #000000;">;

        statement.executeQuery(sql);

        rs</span>=<span style="color: #000000;">statement.executeQuery(sql);

        </span><span style="color: #0000ff;">while</span><span style="color: #000000;">(rs.next()){

            Date date</span>=rs.getDate("regTime"<span style="color: #000000;">);

            Timestamp ts</span>=rs.getTimestamp("loginTime"<span style="color: #000000;">);

            System.out.println(date</span>+"-----"+<span style="color: #000000;">ts);

        }

    } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (SQLException e) {

        e.printStackTrace();

    }

}


}

二、时间单元测试

public class TestTimeData {
Connection connection</span>=<span style="color: #000000;">DBUtil.getInstance().getConnection();

TimeData timeData</span>=<span style="color: #0000ff;">new</span><span style="color: #000000;"> TimeData();

@Test

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> insertDate(){

    timeData.insertDate(connection,System.currentTimeMillis());

}

@Test

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> insertTimestamp(){

    timeData.insertTimestamp(connection,System.currentTimeMillis());

}

@Test

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> insertAppointedDate(){

    </span><span style="color: #008000;">//</span><span style="color: #008000;">插入指定时间</span>

    <span style="color: #0000ff;">long</span> t=timeData.StringToDate("2017-01-01 15:30:00"<span style="color: #000000;">);

    timeData.insertDate(connection,t);

}

@Test

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> insertBatchDate(){

    </span><span style="color: #008000;">//</span><span style="color: #008000;">批量插入某一时间段时间</span>

    <span style="color: #0000ff;">long</span> start=timeData.StringToDate("2016-01-01 12:50:20"<span style="color: #000000;">);

    </span><span style="color: #0000ff;">long</span> end=timeData.StringToDate("2017-12-30 02:00:00"<span style="color: #000000;">);

    timeData.insertBatch(connection,start,end,</span>50<span style="color: #000000;">);

}

@Test

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> query(){

    timeData.query(connection);

}


}

三、大数据对象(Clob、Blob)

public class BigData{

    PreparedStatement pStatement=null;

    /**

     * 插入海量文字通过读取本地文件

     * @param filePath 文件的物理路径

     * @param connection

     */

    public void insertClobByReadFile(Connection connection,String filePath )   {

        try {

            String sql="insert into user(resume)values(?)";

            pStatement=connection.prepareStatement(sql);

            pStatement.setClob(1,new FileReader(new File(filePath)));

            pStatement.executeUpdate();

        }catch (Exception e){

            e.printStackTrace();

        }finally {

            DBUtil.getInstance().close(pStatement);

            DBUtil.getInstance().close(connection);

        }

    }
</span><span style="color: #008000;">/**</span><span style="color: #008000;">

 * 读取存储在数据库的海量文字文件

 </span><span style="color: #008000;">*/</span>

<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> queryClob(Connection connection,<span style="color: #0000ff;">int</span><span style="color: #000000;"> id) {

    ResultSet rs</span>=<span style="color: #0000ff;">null</span><span style="color: #000000;">;

    </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {

        String sql</span>="select resume from user where id=?"<span style="color: #000000;">;

        pStatement</span>=<span style="color: #000000;">connection.prepareStatement(sql);

        pStatement.setInt(</span>1<span style="color: #000000;">,id);

         rs</span>=<span style="color: #000000;">pStatement.executeQuery();

        </span><span style="color: #0000ff;">while</span><span style="color: #000000;"> (rs.next()){

            Clob clob</span>=rs.getClob("resume"<span style="color: #000000;">);

            Reader r</span>=<span style="color: #000000;">clob.getCharacterStream();

            </span><span style="color: #0000ff;">int</span> temp=0<span style="color: #000000;">;

            </span><span style="color: #0000ff;">while</span>((temp=r.read())!=-1<span style="color: #000000;">){

                System.out.print((</span><span style="color: #0000ff;">char</span><span style="color: #000000;">)temp);

            }

        }

    }</span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (Exception e){

        e.printStackTrace();

    }</span><span style="color: #0000ff;">finally</span><span style="color: #000000;"> {

        DBUtil.getInstance().close(rs);

        DBUtil.getInstance().close(pStatement);

        DBUtil.getInstance().close(connection);

    }

}

</span><span style="color: #008000;">/**</span><span style="color: #008000;">

 * 存储图片文件

 * </span><span style="color: #808080;">@param</span><span style="color: #008000;"> connection

 * </span><span style="color: #808080;">@param</span><span style="color: #008000;"> imgPath 图片的物理路径

 </span><span style="color: #008000;">*/</span>

<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> insertBlob(Connection connection,String imgPath) {

    </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {

        pStatement</span>=connection.prepareStatement("insert into user(headImg) values(?);"<span style="color: #000000;">);

        </span><span style="color: #008000;">//</span><span style="color: #008000;">获得图片的输入流</span>

        pStatement.setBlob(1,<span style="color: #0000ff;">new</span> FileInputStream(<span style="color: #0000ff;">new</span><span style="color: #000000;"> File(imgPath)));

        pStatement.execute();

    }</span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (Exception e){

        e.printStackTrace();

    }</span><span style="color: #0000ff;">finally</span><span style="color: #000000;"> {

        DBUtil.getInstance().close(pStatement);

        DBUtil.getInstance().close(connection);

    }

}

</span><span style="color: #008000;">/**</span><span style="color: #008000;">

 *  获取图片文件，并且输入到本地：F:/hello.jpg。

 * </span><span style="color: #808080;">@param</span><span style="color: #008000;"> connection

 * </span><span style="color: #808080;">@param</span><span style="color: #008000;"> id

 </span><span style="color: #008000;">*/</span>

<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> queryBlob(Connection connection,<span style="color: #0000ff;">int</span><span style="color: #000000;"> id){

    ResultSet rs;

    </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {

        String sql</span>="select headImg from user where id=?"<span style="color: #000000;">;

        pStatement</span>=<span style="color: #000000;">connection.prepareStatement(sql);

        pStatement.setInt(</span>1<span style="color: #000000;">,id);

        rs</span>=<span style="color: #000000;">pStatement.executeQuery();

        </span><span style="color: #0000ff;">while</span><span style="color: #000000;">(rs.next()){

            </span><span style="color: #008000;">//</span><span style="color: #008000;">获得文件的blob对象</span>

            Blob blob=rs.getBlob("headImg"<span style="color: #000000;">);

            </span><span style="color: #008000;">//</span><span style="color: #008000;">获取文件的输入流</span>

            InputStream is=<span style="color: #000000;">blob.getBinaryStream();

            </span><span style="color: #008000;">//</span><span style="color: #008000;">建立输出流用于输入图片查看结果</span>

            OutputStream os=<span style="color: #0000ff;">new</span> FileOutputStream(<span style="color: #0000ff;">new</span> File("F:/hello.txt"<span style="color: #000000;">));

            </span><span style="color: #0000ff;">int</span> temp=0<span style="color: #000000;">;

            </span><span style="color: #0000ff;">while</span>((temp=is.read())!=-1<span style="color: #000000;">){

                os.write(temp);

            }

            os.flush();

            os.close();

        }

    }</span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (Exception e){

        e.printStackTrace();

    }

}


}

大数据对象单元测试

public class TestBigData {

　　//获取数据库连接

    Connection connection=DBUtil.getInstance().getConnection();

    BigData bigData=new BigData();

    @Test

    public void insertClob(){

        try {

            String filePath="F:/testclob.txt";

            bigData.insertClobByReadFile(connection,filePath);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }
@Test

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> queryClob(){

    </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {

        bigData.queryClob(connection,</span>1<span style="color: #000000;">);

    } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (Exception e) {

        e.printStackTrace();

    }</span><span style="color: #0000ff;">finally</span><span style="color: #000000;"> {

        DBUtil.getInstance().close(connection);

    }

}

@Test

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> insertBlob(){

    String imgPath</span>="F:/testclob.txt"<span style="color: #000000;">;

    bigData.insertBlob(connection,imgPath);

}

@Test

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> queryBlob(){

    bigData.queryBlob(connection,</span>15906<span style="color: #000000;">);

}


}

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深入浅出JDBC-操作时间与大对象(Clob/Blob)

一、时间(Date、Time、Timestamp)

二、时间单元测试

三、大数据对象(Clob、Blob)

大数据对象单元测试

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