MySQL improves security, scalablity, developer productivity and performance for web, mobile, embedded and Cloud applications. MySQL delivers: Transactional Data Dictionaryimplemented as a set of SQL tables stored in a single InnoDB tablespace.
mysql>showvariableswherevariable_namein('datadir');+---+---+|Variable_name|Value|+---+---+|datadir|/var/lib/mysql/|[root@box1mysql]#ls-ld/var/lib/mysql/db_*drwxr-x---. 2 mysql mysql 20 4月 6 22:53 /var/lib/mysql/db_xdrwxr-x---. 2 mysql mysql 20 4月 6 22:58 /va...
MySQL chooses the database character set and database collation in the following manner: If both CHARACTER SET charset_name and COLLATE collation_name are specified, character set charset_name and collation collation_name are used. If CHARACTER SET charset_name is specified without COLLATE, charact...
Database and table names.When using theNDBstorage engine, the maximum allowed length both for database names and for table names is 63 characters. A statement using a database name or table name longer than this limit fails with an appropriate error. ...
mysql use 数据库名 sql中use 数据库名 1. 前言 如果您的系统中有多个数据库,那么在开始操作之前,您需要先选择一个数据库。 sql use 语句用来选择一个已经存在的数据库。 2. 语法 use 语句的基本语法如下: use databasename; 1. databasename 表示要选择的数据库名称,它必须是存在的。
In order to rename a MySQL database you can do one of the following: 1. Create new database and rename all tables in the old database to be in the new database: CREATEdatabasenew_db_name; RENAMETABLEdb_name.table1TOnew_db_name,db_name.table2TOnew_db_name;DROPdatabasedb_name; ...
Update row This operation updates an existing row in a table.Delete rowOperation ID: DeleteItem This operation deletes a row from a table. Parameters 展开表 NameKeyRequiredTypeDescription Server name server True string Name of MySQL server Database name database True string Database name Tab...
建表:create table worker(id intauto_incrementnot null primary key,name varchar(30)); 一次只插入一条数据: 插入数据:insert into worker values(NULL,'jimy'); 插入数据:insert into worker values(NULL,'Tom'); 然后用last_insert_id()获取值,得到最后一个insert语句的值 ...
NavigationPropertyNameGenerator: A function that is used for the creation of names for navigation properties. Query: A native SQL query used to retrieve data. If the query produces multiple result sets, only the first will be returned. CommandTimeout: A duration that controls how long the serve...
private static final String[] SHUTDOWN_CMD = new String[] { MYSQLADMIN, USER_PARAM + DatabaseSettings.getUser(), PASSWORD_PARAM + DatabaseSettings.getPassword(), SHUTDOWN }; private String _myIniFile = DatabaseSettings.getDefaultIniFile();Navigate...