Using EF 6.1.3 and dotConnect for oracle 8.4.359 in a Code first migration, I tried to convert a data field from NVARCHAR2 to NVARCHAR(max) in SQL server and everything worked fine. But the same migration failed with an Oracle database.
Fluent maping was
this.Property(t => t.Element).HasMaxLength(256);
Changed to
this.Property(t => t.Element).IsMaxLength();
PM console commends
- Add-Migration V1
AlterColumn("A.PREFERENCE", "ELEMENT", c => c.String());
Update-Database -targetmigration V1
System.NotSupportedException: ORA-22859: invalid modification of columns. An attempt was made to modify NCLOB column type.
thanks
JL
Code first migration from NVARCHAR2 to NCLOB failed
Re: Code first migration from NVARCHAR2 to NCLOB failed
That is a limitation of Oracle: it doesn't allow to change datatype of the column from VARCHAR2 to NCLOB.
Try to implement the following workaround:
1. Add the new column.
2. Copy data from the Element column to the new column via SqlOperation.
3. Remove the Element column.
4. Rename the new column to "Element".
Try to implement the following workaround:
1. Add the new column.
2. Copy data from the Element column to the new column via SqlOperation.
3. Remove the Element column.
4. Rename the new column to "Element".