importmysql.connectordefcheck_table_exists(database,table):# 连接到数据库cnx=mysql.connector.connect(user='username',password='password',host='hostname',port='port',database=database)cursor=cnx.cursor()# 查询表信息query=("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES ""WHERE TABLE_SCHEMA = ...
<selectid="checkTableExists"resultType="java.util.Map">select count(*) as cnt from information_schema.tables where table_schema = database() and `table_name` = #{tableName}</select>
下面是一个简单的MySQL存储过程,用于检查表是否存在: DELIMITER//CREATEPROCEDUREcheck_table_exists(INtable_nameVARCHAR(50),OUTtable_existsBOOLEAN)BEGINDECLAREnum_tablesINT;SELECTCOUNT(*)INTOnum_tablesFROMinformation_schema.tablesWHEREtable_schema=DATABASE()ANDtable_name=table_name;IFnum_tables>0THENSETtable...
SELECT ‘Table exists’; ELSE SELECT ‘Table does not exist’; END IF; END$$ DELIMITER ; “` 2、调用存储过程: “`sql CALL CheckTableExists(‘your_database_name’, ‘your_table_name’); “` 同样,将your_database_name替换为你的数据库名,your_table_name替换为你想查询的表名。 方法四:使...
SELECT 1 FROM testtable LIMIT 1; If there's no error,tableexists. 方法二、Or,ifyou wanttobe correct,useINFORMATION_SCHEMA.SELECT*FROMinformation_schema.tablesWHEREtable_schema='yourdb'ANDtable_name='testtable'LIMIT1; 方法三、 Alternatively, you canuseSHOW TABLES ...
SET @tableName = 'your_table_name'; CALL CheckTableExists(@tableName, @exists); SELECT @exists; 优势 性能:存储过程在首次执行时会被编译并存储在数据库中,后续调用时无需再次编译,提高了执行效率。 安全性:可以通过权限控制限制对存储过程的访问,从而提高数据库的安全性。
What I am trying to do is create some code which will allow me to check if a table of a certain name exists in a database. If the table DOES exist, then I want the code to then insert values into the table. If the table does not exist, then the table should be created, and ...
import mysql.connector def check_table_exists(host, user, password, database, table_name): try: conn = mysql.connector.connect(host=host, user=user, password=password, database=database) cursor = conn.cursor() query = f"SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA =...
in_table VARCHAR(64): The name of the table to check the existence 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...
//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?