MySQL中的binary类型使用操作

admin MySQL 2022-02-09 20:32:59 MySQL binary类型"

本文主要向大家介绍了MySQL数据库之MySQL的binary类型操作，通过具体的内容向大家展现，希望对大家学习MySQL数据库有所帮助。

示例数据表：

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

插入数据(内容是一个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‘);

查询数据：

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‘;

查询结果：

bin_id

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

FA34E10293CB42848573A4E39937F479

备注：使用MySQL内置的 UUID() 创建一个函数返回 BINARY（16）类型的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()函数：