1. 创建一个指定的数据库: CREATE DATABASE 数据库名 例:建立test数据库。 CREATE DATABASE IF NOT EXISTS test; #如果不存在test,就创建该数据库 1. 2. 删除一个指定的数据库:DROP DATABASE 数据库名 例:删除test数据库。 DROP DATABASE IF EXISTS test; # 如果存在test,则删除该数据库 SHOW DATABASES ...
CREATE TABLE example (id INT) ENGINE=InnoDB; MyISAM:适合读密集型应用,支持全文索引CREATE TABLE logs (id INT, message TEXT) ENGINE=MyISAM; Memory:将数据存储在内存中,速度极快但不持久CREATE TABLE temp_data (id INT) ENGINE=MEMORY; Archive:适合存储和检索大量很少被查询的历史数据...
DELIMITER//CREATEPROCEDURECheckDatabaseExistence(INdatabaseNameVARCHAR(50),OUTdatabaseExistsBOOLEAN)BEGINDECLAREcountINT;SELECTCOUNT(*)INTOcountFROMINFORMATION_SCHEMA.SCHEMATAWHERESCHEMA_NAME=databaseName;IFcount>0THENSETdatabaseExists=TRUE;ELSESETdatabaseExists=FALSE;ENDIF;END//DELIMITER; 1. 2. 3. 4. ...
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DDL 库、表类操作 create database db1;#创建数据库db1 create database if not exist db1;#如果不存在db1则创建 create database...gbk set names gbk;#修改客户端,连接,查询结果字符集为gbk #以上两句在关闭dos会失效 insert into std2 select * from std;#将std中的数据蠕虫复制...
DROP {DATABASE|SCHEMA}[IF EXSITS] db_name 修改数据库: ALTER {DATABASE|SCHEMA} db_name [DEFAULT] [CHARACTER SET=''] [COLLATE=''] 数据库名称修改比较复杂 备份库中个表,删除原库,还原库 表创建方式1: Syntax: CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name [(create_definition,...)] ...
createPool({ connectionLimit : 10, host : 'example.org', user : 'bob', password : 'secret', database : 'my_db' }); pool.query('SELECT 1 + 1 AS solution', function (error, results, fields) { if (error) throw error; console.log('The solution is: ', results[0].solution); }...
(一)库database(文件夹) 增:create database db1 charset utf8; 查:show databases; 改:alter database db1 charset latin1; 删: drop database db1; (二)表table(文件) ***先选择文件夹,也就是要操作的库*** select database(); 查看当前所在的库 use db...
If the Linked Server was created with the Allow in-process option enabled, then you should delete this Linked Server and create it again with the Allow in-process option disabled. While setting up, you need to set the RPC and RPC Out fields to True. In case when these two options are ...