mysql中utf8_general_ci的用法是什么

小億
433
2024-03-11 14:37:20
欄目: 云計(jì)算

在MySQL中,utf8_general_ci是一種字符集和校對(duì)規(guī)則的組合,用于指定數(shù)據(jù)庫(kù)中存儲(chǔ)和比較文本數(shù)據(jù)的方式。utf8_general_ci表示使用UTF-8編碼存儲(chǔ)數(shù)據(jù),并且比較時(shí)不區(qū)分大小寫(xiě)。

具體用法如下:

  1. 創(chuàng)建數(shù)據(jù)庫(kù)時(shí)指定字符集和校對(duì)規(guī)則為utf8_general_ci:
CREATE DATABASE dbname CHARACTER SET utf8 COLLATE utf8_general_ci;
  1. 創(chuàng)建表時(shí)指定字段的字符集和校對(duì)規(guī)則為utf8_general_ci:
CREATE TABLE tablename (
    columnname VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci
);
  1. 修改表字段的字符集和校對(duì)規(guī)則為utf8_general_ci:
ALTER TABLE tablename MODIFY columnname VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci;
  1. 查詢(xún)時(shí)使用utf8_general_ci校對(duì)規(guī)則:
SELECT * FROM tablename WHERE columnname = 'value' COLLATE utf8_general_ci;

通過(guò)使用utf8_general_ci字符集和校對(duì)規(guī)則,可以確保數(shù)據(jù)庫(kù)中的文本數(shù)據(jù)以UTF-8編碼存儲(chǔ),并且比較時(shí)不區(qū)分大小寫(xiě),提高數(shù)據(jù)的準(zhǔn)確性和一致性。

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