The database character set and collation are used as default values if the table character set and collation are not specified in CREATE table statements.
如果在CREATE TABLE语句中没有指定表字符集和校对规则，则使用数据库字符集和校对规则作为默认值。
Escape user-supplied input using the character escaping scheme set up by your database.
使用数据库设置的字符转义方案转义用户提供的输入。
Character set conversion into the database code page is performed if necessary.
如有必要，执行字符集到数据库代码页的转换。
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