1. 来到MySQL的安装路径下bin(cd 在系统中的目录地址) 2. 在命令行中输入mysqld --install 3. 执行 net start mysql: 如果显示MySQL服务器启动成功,那就成功啦,如果显示的是MySQL服务无法启动的话,就请删除mysql下的data文件,重新执行 mysqld --initialize 就可以在当前路径下生成data文件夹, 再执行net start...
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USE databasename;SELECT * FROM table1;如果使用USE语句来切换到不存在的数据库，MySQL将显示一条错误消息，表明数据库不存在：ERROR 1049 (42000): Unknown database 'databasename'当一个用户连接到MySQL服务器时，MySQL会默认将其当前数据库设置为“ latest”。此外，MySQL还允许用户使用SHOW DATABASES语句来显示...
Re: ERROR 1049 (42000): Unknown database 'mysql' ..while executing USE mysql; sandeep thakur November 11, 2011 06:34AM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in...
While it's not a problem now, it could cause errors if you change the version of one of them later. The Gemfile's dependencies are satisfied Unknown database adapter `"mysql2"` found in config/database.yml, use Gemfile.local to load your own database gems Unknown database adapter `"...
CR_UNKNOWN_ERROR:出现未知错误。 使用说明 调用mysql_real_query()或mysql_query()后,必须为成功生成结果集的语句(SELECT、SHOW、DESCRIBE、EXPLAIN、CHECK TABLE等)调用mysql_store_result()或mysql_use_result()。在处理完结果集后,必须调用mysql_free_result()。
你先用 show databases; 命令看一看当前环境中有没有 test 数据库, 可能是你用 drop database *** 命令drop掉了。 其实完全可以自己建一个数据库, create database test1; 3 1 wshyzx 上面这个我明白了。用show databases;后显示的文件没有test,或者说没有没见到 .db 类型的文件。 怎么建数据库? 2016...
If a unit is specified but not supported by MySQL, anER_UNIT_NOT_FOUNDerror occurs. If a supported linear unit is specified and the SRID is 0, anER_GEOMETRY_IN_UNKNOWN_LENGTH_UNITerror occurs. If a supported linear unit is specified and the SRID is not 0, the result is in that unit...
When usingmysql_use_result(), you must executemysql_fetch_row()until aNULLvalue is returned, otherwise, the unfetched rows are returned as part of the result set for your next query. The C API gives the errorCommands out of sync; you can't run this command nowif you forget to do th...
Thank you for the bug report and test case. I tried to reproduce the issue at my end using MySQL Connector / J 5.1.43 and MySQL 5.7.19 but not seeing any issues with UNION ALL and useServerPrepStmts= ture. Could you please provide repeatable test case (exact steps, database/create ...