你可以这样做:

            string strCheck = "SHOW TABLES LIKE \'tableName\'";
            cmd = new MySqlCommand(strCheck, connection);
            if (connection.State == ConnectionState.Closed)
            {
                connection.Open();
            }
            cmd.Prepare();
            var reader = cmd.ExecuteReader();
            if (reader.HasRows)
            {                             
              Console.WriteLine("Table Exist!");
            }
            else
            {                             
              Console.WriteLine("Table does not Exist!");
            }

您可以查询INFORMATION_SCHEMA表的系统视图:

SELECT table_name
FROM information_schema.tables
WHERE table_schema = 'databasename'
AND table_name = 'testtable';

如果没有返回行，则表不存在。

只是添加一个额外的方法来做它，这取决于你需要它的原因，你可以使用一个处理er_no_such_table错误:1146的处理程序，如下所示:

DELIMITER ;;
CREATE PROCEDURE `insert_in_my_table`(in my_var INT)
BEGIN
   -- Error number for table not found
   DECLARE CONTINUE HANDLER FOR 1146
   BEGIN
      -- table doesn't exists, do something...
      CREATE TABLE my_table(n INT);
      INSERT INTO my_table (n) values(my_var);
   END;
      -- table does exists, do something...
      INSERT INTO my_table (n) values(my_var);
END ;;
DELIMITER ;

如果存在则返回1，不存在则返回0。

set @ret = 0; 
SELECT 1 INTO @ret FROM information_schema.TABLES 
         WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'my_table'; 
SELECT @ret;

可以放入mysql函数中

DELIMITER $$
CREATE FUNCTION ExistTable (_tableName varchar(255))
RETURNS tinyint(4)
SQL SECURITY INVOKER
BEGIN
  DECLARE _ret tinyint;
  SET _ret = 0;
  SELECT
    1 INTO _ret
  FROM information_schema.TABLES
  WHERE TABLE_SCHEMA = DATABASE()
  AND TABLE_NAME = _tablename LIMIT 1;
  RETURN _ret;
END
$$
DELIMITER ;

并称之为

Select ExistTable('my_table');

如果存在则返回1，如果不存在则返回0。

SELECT count(*)
FROM information_schema.TABLES
WHERE (TABLE_SCHEMA = 'your_db_name') AND (TABLE_NAME = 'name_of_table')

如果得到非零计数，则表存在。

在创建TABLE之前，最好先检查SQL Server数据库中是否存在该表。

USE [DB_NAME]
GO
IF OBJECT_ID('table_name', 'U') IS NOT NULL
BEGIN
PRINT 'Table exists.'
END
ELSE
BEGIN
PRINT 'Table does not exist.'
END

另外 使用sys。对象，检查SQL Server中是否存在表。

USE [DB_NAME]
GO
IF EXISTS(SELECT 1 FROM sys.Objects
WHERE Object_id = OBJECT_ID(N'table_name')
AND Type = N'U')
BEGIN
PRINT 'Table exists.'
END
ELSE
BEGIN
PRINT 'Table does not exist.'
END