How to check table exist and then rename it

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SQL-Server-2008R2

Hi coder I am stuck at a point and I need your help.. PFB code:

DECLARE @TableSchema sys.sysname = N'dbo';
DECLARE @TableName sys.sysname = N'x';
DECLARE @BackupTable sys.sysname = @TableName + '_' + CONVERT(VARCHAR(32), GETDATE(), 120);


DECLARE @SQL NVARCHAR(MAX) = N'

DECLARE @TableWithSchema NVARCHAR(256) = QUOTENAME(@TableSchema) + ''.'' + QUOTENAME(@TableName);

IF (EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES 
             WHERE TABLE_SCHEMA = @TableSchema
             AND  TABLE_NAME = @TableName))
BEGIN
  EXEC sp_rename @TableWithSchema, @BackupTable, ''OBJECT''
END

CREATE TABLE ' + QUOTENAME(@TableSchema) + '.' + QUOTENAME(@TableName) + '(
/* Column definitions here*/
);
';

EXEC sp_executesql
    @stmt = @SQL
  , @params = N'@TableSchema sys.sysname, @TableName sys.sysname, @BackupTable sys.sysname'
  , @TableSchema = @TableSchema
  , @TableName = @TableName
  , @BackupTable = @BackupTable
;
DECLARE @CMD nvarchar(8000)
 SET @CMD='BCP db..'+@TableName+' IN file path -T -f -t,-c -E'
 EXEC MASTER..XP_CMDSHELL @CMD

This code is working fine but in this code suppose I have no table with name X so I m doing it for the first time, when I run it for the first time it will create a table with name X, when I run it for the second time it should update the existing one with x_getdate() but it is creating new table how can I fix this

What I have tried:

C#

DECLARE @TableSchema sys.sysname = N'dbo';
DECLARE @TableName sys.sysname = N'x';
DECLARE @BackupTable sys.sysname = @TableName + '_' + CONVERT(VARCHAR(32), GETDATE(), 120);


DECLARE @SQL NVARCHAR(MAX) = N'

DECLARE @TableWithSchema NVARCHAR(256) = QUOTENAME(@TableSchema) + ''.'' + QUOTENAME(@TableName);

IF (EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES 
             WHERE TABLE_SCHEMA = @TableSchema
             AND  TABLE_NAME = @TableName))
BEGIN
  EXEC sp_rename @TableWithSchema, @BackupTable, ''OBJECT''
END

CREATE TABLE ' + QUOTENAME(@TableSchema) + '.' + QUOTENAME(@TableName) + '(
/* Column definitions here*/
);
';

EXEC sp_executesql
    @stmt = @SQL
  , @params = N'@TableSchema sys.sysname, @TableName sys.sysname, @BackupTable sys.sysname'
  , @TableSchema = @TableSchema
  , @TableName = @TableName
  , @BackupTable = @BackupTable
;
DECLARE @CMD nvarchar(8000)
 SET @CMD='BCP db..'+@TableName+' IN file path -T -f -t,-c -E'
 EXEC MASTER..XP_CMDSHELL @CMD

Posted 26-Jun-17 22:31pm

amitesh1989

Updated 26-Jun-17 23:14pm

Thanks7872

v3

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RickZeeland · Answer 1 · 2017-06-26T23:14:00

Solution 1

Check for table in SQL:

SQL

SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'TableName'

Rename table:

SQL

EXEC sp_rename 'TableName', 'NewTableName'

Check for table in C#:

C#

public static bool CheckTableExists(string connectionString, string tableName)
        {
            string query = string.Format(@"SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = '{0}'", tableName);

            return ExecuteScalar(connectionString, query);
        }

Posted 26-Jun-17 23:14pm

RickZeeland

Updated 26-Jun-17 23:18pm

v2

Comments

amitesh1989 27-Jun-17 6:08am

i am not using c# I am just doing it in sql

RickZeeland 27-Jun-17 12:25pm

That's your good right :)

amitesh1989 28-Jun-17 0:36am

what?

RickZeeland 28-Jun-17 4:39am

Maybe you noticed that I also included the SQL command in the solution, you don't have to use C# !