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MySQL中的binary類型使用操作

更新時間：2020年12月04日 16:13:02 作者：xiangwang2016

這篇文章主要介紹了MySQL中的binary類型使用操作，具有很好的參考價值，希望對大家有所幫助。一起跟隨小編過來看看吧

本文主要向大家介紹了MySQL數(shù)據(jù)庫之MySQL的binary類型操作，通過具體的內(nèi)容向大家展現(xiàn)，希望對大家學(xué)習(xí)MySQL數(shù)據(jù)庫有所幫助。

示例數(shù)據(jù)表：

CREATE TABLE test_bin (
  bin_id BINARY(16) NOT NULL
) Engine=InnoDB;

插入數(shù)據(jù)(內(nèi)容是一個32位的UUID字符串值)：

INSERT INTO test_bin(bin_id) VALUES(UNHEX(‘FA34E10293CB42848573A4E39937F479‘));

INSERT INTO test_bin(bin_id) VALUES(UNHEX(?));

或

INSERT INTO test_bin(bin_id) VALUES(x‘FA34E10293CB42848573A4E39937F479‘);

查詢數(shù)據(jù)：

SELECT HEX(bin_id) AS bin_id FROM test_bin;
 
SELECT HEX(bin_id) AS bin_id FROM test_bin WHERE bin_id = UNHEX(‘FA34E10293CB42848573A4E39937F479‘);
SELECT HEX(bin_id) AS bin_id FROM test_bin WHERE bin_id = UNHEX(?);
 
SELECT HEX(bin_id) AS bin_id FROM test_bin WHERE bin_id = x‘FA34E10293CB42848573A4E39937F479‘;

查詢結(jié)果：

bin_id

--------------------------

FA34E10293CB42848573A4E39937F479

備注：使用MySQL內(nèi)置的 UUID() 創(chuàng)建一個函數(shù)返回 BINARY（16）類型的UUID值

CREATE FUNCTION uu_id() RETURNS binary(16) RETURN UNHEX(REPLACE(UUID(),‘-‘,‘‘));

或

CREATE FUNCTION uu_id() RETURNS binary(16) RETURN UNHEX(REVERSE(REPLACE(UUID(),‘-‘,‘‘)));

使用：

INSERT INTO test_bin(bin_id) VALUES(uu_id());

范例1：

Connection conn = null;
 Statement stat = null;
 ResultSet rs = null;
 try {
  conn = JDBCUtils.getConnection(map);
  String sql = "select HEX(RECID) AS recid,STDNAME AS stdname ,HEX(RESID) AS resid from jyyt";
  stat = conn.createStatement();
  rs = stat.executeQuery(sql);
  while (rs.next()) {
  String recid = rs.getString("recid");
  String staname = rs.getString("stdname");
  String resid = rs.getString("resid");
  System.out.println(recid + "---" + staname + "---" + resid);
  }
 } catch (SQLException e) {
  e.printStackTrace();
 } finally {
  JDBCUtils.closeConnection(conn, stat, rs);
 }

范例2：

SELECT
 y.UNITID AS unitid,
 y.UNITNAME AS unitName,
 y.WARNINGTYPE AS warningType 
FROM
 GXJT_YJ AS y
 LEFT JOIN md_org AS m ON m.RECID = y.UNITID
 LEFT JOIN PMS_COMPANY_INFO AS p ON m.RECID = p.UNITID 
WHERE
 HEX(m.parents) LIKE '%66F7B47C80000101D5E8ABF15CD9DA73%' 
AND y.WARNINGTYPE = 'REGISTRATION_DIFFERENT'

未使用HEX()函數(shù)：