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查库: select schema_name from information_schema.schemata;查表: select table_name from information_schema.tables where table_schema='security';查列: select 阅读全文
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select if() select database() substr((select database()),1,1) ascii(substr((select database()),1,1)) select if(ascii(substr((select database()),1,1)) 阅读全文
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Less7 1.文件读写权限问题 show variables like '%secure%';查看 secure-file-priv 当前的值,如果显示为NULL,则需要打开 C:\phpstudy\PHPTutorial\MySQL\my.ini文件,在其中加上一句:secure_file_pr 阅读全文