sql if file exists

C # Connecting to SQL Server databases For the different. NET data provider, ADO. NET uses different connection objects to connect to the database. These connection objects mask the specific implementation details, and provide a unified

Import data with a. sql file, and if you import the Table1 table, the table table1 exists first ALTER table How do I write this SQL? Thank you Reply to discussion (solution) What's the name of the table?Change a table that already exists? So

Mysql uses the. SQL file to import data to the renamed SQL statement if the TABLE exists. if the TABLE table1 is imported, the TABLE table1 first needs to be modified. How can I write this SQL statement? Thank you. Reply to discussion

In SQL Server, you can use the system internal stored procedure xp_fileexist to determine whether a file exists, and then use xp_cmdshell to delete the file if it exists. Xp_fileexist In addition to being able to determine whether a file exists, you

For more information about bugs fixed in SQL Server 2000 Service Pack 4, click the following article number to view the article in the Microsoft Knowledge Base:314128 FIX: When an RPC call is performed, Access with conflicting values includes an

1. Call instructions for xp_fileexist 1,Xp_fileexist "C: \ autoexec. Bat" File exists file is a directory parent directory exists-----------------------------------------------------1 0 1-- Table 1 exists, Table 0 does not exist(1 row (s) affected)--

How to solve the connection problem in SQL Server 2000 Applicable Important: This article contains information about modifying the registry. Before modifying the registry, you must back up the registry and know how to restore the Registry in case of

server| Resolution | How the problem resolves connection problems in SQL Server 2000 apply to important notes: This article contains information about modifying the registry. Be sure to back up the registry before you modify the registry, and be

ExistsReturns true or false, depending on whether the result set returned by the subquery contains at least one row. Unlike other predicates (such as in) and logical expressions, exists cannot return unknown. Subquery or return the row set, or do

PHP Implementation database backup exported to SQL 1. First you have to get the tables in the database, the function mysql_list_tables (), and then you can save all the table names you get to an array. 2. Show create table name can get table