Move tables from one database to another with primary key - sql

Question

I want to move the tables from one database to another, using dynamic SQL queries. I have a stored procedure to move the tables, but it is not moving the primary keys with table
This is my code:
set #cSQL='Select Name from '+#cSDBName+'.sys.tables where Type=''U'''
Insert into #t1Table
exec (#cSQL)
while((select count(tName) from #t1Table)>0)
begin
select top 1 #cName=tName from #t1Table
set #cSQL='Select * into '+#cDBName+'.dbo.'+#cName+' from '+#cSDBName+'.dbo.'+#cName +' where 1=2'
exec(#cSQL)
delete from #t1Table where tName=#cName
end
Here #cSDBName is the name of the source database and #cSQL is the SQL statement.
But this process won't move the primary key
Can anyone help me with this?

Answer 1

See this...
Clones an existing table to another table (without data)
Optionally drops and re-creates target table
Copies:
* Structure
* Primary key
* Indexes (including ASC/DESC, included columns, filters)
* Constraints (and unique constraints)
DOES NOT copy:
* Triggers
* File groups
* Probably a lot of other things
Note: Assumes that you name (unique) constraints with the table name in it (in order to not duplicate constraint names)
*/
SET NOCOUNT ON;
BEGIN TRANSACTION
--drop the table
if EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = #DestinationSchema AND TABLE_NAME = #DestinationTable)
BEGIN
if #RecreateIfExists = 1
BEGIN
exec('DROP TABLE [' + #DestinationSchema + '].[' + #DestinationTable + ']')
END
ELSE
RETURN
END
--create the table
exec('SELECT TOP (0) * INTO [' + #DestinationSchema + '].[' + #DestinationTable + '] FROM [' + #SourceSchema + '].[' + #SourceTable + ']')
DECLARE #PKSchema nvarchar(255), #PKName nvarchar(255)
SELECT TOP 1 #PKSchema = CONSTRAINT_SCHEMA, #PKName = CONSTRAINT_NAME FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE TABLE_SCHEMA = #SourceSchema AND TABLE_NAME = #SourceTable AND CONSTRAINT_TYPE = 'PRIMARY KEY'
--create primary key
IF NOT #PKSchema IS NULL AND NOT #PKName IS NULL
BEGIN
DECLARE #PKColumns nvarchar(MAX)
SET #PKColumns = ''
SELECT #PKColumns = #PKColumns + '[' + COLUMN_NAME + '],'
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
where TABLE_NAME = #SourceTable and TABLE_SCHEMA = #SourceSchema AND CONSTRAINT_SCHEMA = #PKSchema AND CONSTRAINT_NAME= #PKName
ORDER BY ORDINAL_POSITION
SET #PKColumns = LEFT(#PKColumns, LEN(#PKColumns) - 1)
exec('ALTER TABLE [' + #DestinationSchema + '].[' + #DestinationTable + '] ADD CONSTRAINT [PK_' + #DestinationTable + '] PRIMARY KEY CLUSTERED (' + #PKColumns + ')');
END
--create other indexes
DECLARE #IndexId int, #IndexName nvarchar(255), #IsUnique bit, #IsUniqueConstraint bit, #FilterDefinition nvarchar(max)
DECLARE indexcursor CURSOR FOR
SELECT index_id, name, is_unique, is_unique_constraint, filter_definition FROM sys.indexes WHERE type = 2 and object_id = object_id('[' + #SourceSchema + '].[' + #SourceTable + ']')
OPEN indexcursor;
FETCH NEXT FROM indexcursor INTO #IndexId, #IndexName, #IsUnique, #IsUniqueConstraint, #FilterDefinition;
WHILE ##FETCH_STATUS = 0
BEGIN
DECLARE #Unique nvarchar(255)
SET #Unique = CASE WHEN #IsUnique = 1 THEN ' UNIQUE ' ELSE '' END
DECLARE #KeyColumns nvarchar(max), #IncludedColumns nvarchar(max)
SET #KeyColumns = ''
SET #IncludedColumns = ''
select #KeyColumns = #KeyColumns + '[' + c.name + '] ' + CASE WHEN is_descending_key = 1 THEN 'DESC' ELSE 'ASC' END + ',' from sys.index_columns ic
inner join sys.columns c ON c.object_id = ic.object_id and c.column_id = ic.column_id
where index_id = #IndexId and ic.object_id = object_id('[' + #SourceSchema + '].[' + #SourceTable + ']') and key_ordinal > 0
order by index_column_id
select #IncludedColumns = #IncludedColumns + '[' + c.name + '],' from sys.index_columns ic
inner join sys.columns c ON c.object_id = ic.object_id and c.column_id = ic.column_id
where index_id = #IndexId and ic.object_id = object_id('[' + #SourceSchema + '].[' + #SourceTable + ']') and key_ordinal = 0
order by index_column_id
IF LEN(#KeyColumns) > 0
SET #KeyColumns = LEFT(#KeyColumns, LEN(#KeyColumns) - 1)
IF LEN(#IncludedColumns) > 0
BEGIN
SET #IncludedColumns = ' INCLUDE (' + LEFT(#IncludedColumns, LEN(#IncludedColumns) - 1) + ')'
END
IF #FilterDefinition IS NULL
SET #FilterDefinition = ''
ELSE
SET #FilterDefinition = 'WHERE ' + #FilterDefinition + ' '
if #IsUniqueConstraint = 0
exec('CREATE ' + #Unique + ' NONCLUSTERED INDEX [' + #IndexName + '] ON [' + #DestinationSchema + '].[' + #DestinationTable + '] (' + #KeyColumns + ')' + #IncludedColumns + #FilterDefinition)
ELSE
BEGIN
SET #IndexName = REPLACE(#IndexName, #SourceTable, #DestinationTable)
exec('ALTER TABLE [' + #DestinationSchema + '].[' + #DestinationTable + '] ADD CONSTRAINT [' + #IndexName + '] UNIQUE NONCLUSTERED (' + #KeyColumns + ')');
END
FETCH NEXT FROM indexcursor INTO #IndexId, #IndexName, #IsUnique, #IsUniqueConstraint, #FilterDefinition;
END;
CLOSE indexcursor;
DEALLOCATE indexcursor;
--create constraints
DECLARE #ConstraintName nvarchar(max), #CheckClause nvarchar(max)
DECLARE constraintcursor CURSOR FOR
SELECT REPLACE(c.CONSTRAINT_NAME, #SourceTable, #DestinationTable), CHECK_CLAUSE from INFORMATION_SCHEMA.CONSTRAINT_TABLE_USAGE t
INNER JOIN INFORMATION_SCHEMA.CHECK_CONSTRAINTS c ON c.CONSTRAINT_SCHEMA = TABLE_SCHEMA AND c.CONSTRAINT_NAME = t.CONSTRAINT_NAME
WHERE TABLE_SCHEMA = #SourceSchema AND TABLE_NAME = #SourceTable
OPEN constraintcursor;
FETCH NEXT FROM constraintcursor INTO #ConstraintName, #CheckClause;
WHILE ##FETCH_STATUS = 0
BEGIN
exec('ALTER TABLE [' + #DestinationSchema + '].[' + #DestinationTable + '] WITH CHECK ADD CONSTRAINT [' + #ConstraintName + '] CHECK ' + #CheckClause)
exec('ALTER TABLE [' + #DestinationSchema + '].[' + #DestinationTable + '] CHECK CONSTRAINT [' + #ConstraintName + ']')
FETCH NEXT FROM constraintcursor INTO #ConstraintName, #CheckClause;
END;
CLOSE constraintcursor;
DEALLOCATE constraintcursor;
COMMIT TRANSACTION
END

Answer 2

Well, the query you've written only moves the data. You've not specified the primary keys anywhere.
You'll need to either create the tables via your script, or alter the table via your script to define the primary keys.