方法三、 Alternatively, you canuseSHOW TABLES SHOW TABLESLIKE'yourtable';Ifthereisa rowinthe resultset,tableexists. 个人觉得方法三很不错 FROM:http://stackoverflow.com/questions/8829102/mysql-check-if-table-exists-without-using-select-from#8829109...
方法三、 Alternatively, you canuseSHOW TABLES SHOW TABLESLIKE'yourtable';Ifthereisa rowinthe resultset,tableexists. 个人觉得方法三很不错 FROM:http://stackoverflow.com/questions/8829102/mysql-check-if-table-exists-without-using-select-from#8829109...
下面是一个示例代码,用于判断名为users的表是否存在: importmysql.connectordefcheck_table_exists():conn=mysql.connector.connect(host="localhost",user="root",passwd="password",database="mydatabase")cursor=conn.cursor()cursor.execute("SELECT table_name FROM INFORMATION_SCHEMA.TABLES WHERE table_schema ...
语法格式:alter table 表名 modify 字段名 新数据库类型 auto_increment[=n]; 参数说明如下: [IF NOT EXISTS] :可选子句,该子句可防止创建数据库服务器中已存在的新数据库的错误,即不能在MySQL服务器中创建具有相同名称的数据库。 例:设置commpany表中的commpany_id字段值自动增加 3.删除字段的自动增长 语法格...
in your c program you can check: if(row_count==1) /* then table exists; */Navigate: Previous Message• Next Message Options: Reply• Quote Subject Written By Posted Check if a table exists Alexandre Lu August 24, 2006 09:12AM Re: Check if a table exists Bob Field August ...
in_table VARCHAR(64): The name of the table to check the existance of. out_exists ENUM('', 'BASE TABLE', 'VIEW', 'TEMPORARY'): The return value. This is an OUT parameter, so it must be a variable into which the table type can be stored. When the procedure returns, the variabl...
drop tableifexists t_user;create tablet_user(id int,usernamevarchar(255)unique// 列级约束);insert into t_uservalues(1,'zhangsan');insert into t_uservalues(2,'zhangsan');ERROR1062(23000):Duplicate entry'zhangsan'forkey'username'insert intot_user(id)values(2);insert intot_user(id)values(...
表结构 DROP DATABASE IF EXISTS test1; CREATE DATABASE test1; USE test1; ##部门表 #DROP IF EXISTS TABLE DEPT; CREATE TABLE DEPT( DEPTNO int PRIMARY KEY,##部门编号 DNAME VARCHAR(14) , ##部门名称 LOC VARCHAR(13) ##部门地址 ) ; INSERT INTO DEPT VALUES (10,'ACCOU Java学习 2018/04/17...
sqlIF EXISTS DROP DATABASE test_db;或者更简洁地使用：sqlDROP DATABASE IF EXISTS test_db;总结：IF EXISTS在MySQL中主要用于在尝试删除数据库或表之前检查其是否存在，以避免错误。它通常与DROP DATABASE或DROP TABLE语句一起使用，并且有一个更简洁的语法形式DROP ... IF EXISTS ...。
//table name is test show tables from dbname like 'test' or you try this one: SELECT count(*) FROM information_schema.tables WHERE table_name='your_table_name' AND table_schema='your_database_name' Subject Written By Posted how to check if a table exists?