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If you are using the C API, the affected-rows count can be obtained using the mysql_affected_rows() function. You cannot replace into a table and select from the same table in a subquery. MySQL uses the following algorithm for REPLACE (and LOAD DATA ... REPLACE):
- 14 Functions and Operators
This chapter describes the built-in functions and operators...
- 14.8 String Functions and Operators
mysql> SELECT REPLACE('www.mysql.com', 'w', 'Ww'); ->...
- 14 Functions and Operators
This chapter describes the built-in functions and operators that are permitted for writing expressions in MySQL. For information about loadable functions and stored functions, see Section 7.7, “MySQL Server Loadable Functions”, and Section 27.2, “Using Stored Routines”.
mysql> SELECT REPLACE('www.mysql.com', 'w', 'Ww'); -> 'WwWwWw.mysql.com' This function is multibyte safe. It returns NULL if any of its arguments are NULL. REVERSE(str) Returns the string str with the order of the characters reversed, or NULL if str is NULL.
Support for pre-4.1 password hashes was removed in MySQL 5.7.5. This includes removal of the mysql_old_password authentication plugin and the OLD_PASSWORD () function. Also, secure_auth cannot be disabled, and old_passwords cannot be set to 1.
Abstract. This document contains release notes for the changes in MySQL 8.4. For information about changes in a different version of MySQL, see the release notes for that version.
12 lis 2024 · This is the MySQL Reference Manual. It documents MySQL 8.0 through 8.0.41, as well as NDB Cluster releases based on version 8.0 of NDB through 8.0.41, respectively. It may include documentation of features of MySQL versions that have not yet been released.
REPLACE 是 MySQL 扩展的 SQL 标准。 它可以插入、删除和插入。 另一个 MySQL 扩展到标准 SQL—that 可以插入或 更新 —请参阅 第15.2.7.2节，“INSERT ... ON DUPLICATE KEY UPDATE Statement” 。 DELAYED 插入和替换在 MySQL 5.6 中被弃用。 在 MySQL 8.4 中， DELAYED 不被支持。 服务器识别但忽略 DELAYED 关键字，处理替换为非延迟替换，并生成一个 ER_WARN_LEGACY_SYNTAX_CONVERTED 警告： REPLACE DELAYED 不再支持。 语句被转换为 REPLACE 。 DELAYED 关键字将在未来的版本中被删除。 Note.
