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Article ID: 1007
Last updated: 02 Feb, 2008
Problem
When I try to create a new table in the database with the schema of an existing table, I expect the new table to have the same schema as that of the old table. This doesn't always happen.
Cause
Whenever you get a schema from an existing table, the column types are mapped with the DBTools datatypes as shown in the tables 1 & 2 of Chapter 2 in the DBTools access library manuals(oracle,sybase,Informix,odbc,MS SQL server, DB2).
Action
When I try to create a new table in the database with the schema of an existing table, I expect the new table to have the same schema as that of the old table. This doesn't always happen.
Cause
Whenever you get a schema from an existing table, the column types are mapped with the DBTools datatypes as shown in the tables 1 & 2 of Chapter 2 in the DBTools access library manuals(oracle,sybase,Informix,odbc,MS SQL server, DB2).
This mapping does not have a one to one relationship. There is one to many and many to one mapping between the native database datatypes and DBTools datatypes. So the new table created may or may not have the same schema as that of the old one.
Action
What should you do now ?//RWDBValue::NoType forces the schema to use the native database schema and will not do mapping with DBTools datatypes.
RWDBTable mytable = mydatabase.table(cool_dude_table);
//here you get the schema from the existing table
myTable.fetchSchema();
RWDBSchema schema = mytable.schema();
for( int i = 0; i < schema.entries(); i++ )
{
schema[i].type( RWDBValue::NoType );
}
Now your new table will have the exactly same schema as that of the old table.
myDatabase.createTable( new_table, schema );
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Article ID: 1007
Last updated: 02 Feb, 2008
Revision: 1
Views: 2948
Posted: 20 Nov, 1998 by
Dean J.
Updated: 02 Feb, 2008 by
Dean J.
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