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Trigger created. Now the insert should work: benchmark@ORA10G> insert into components_or_view values 2 ( 3 3, 'component 3', 4 part_type_tab(part_type(3,6,'part 11', 'part 11 description')) 5 ); 1 row created. But how about if we just want to insert data into the parts table One way to do so is to use update, in which case our update trigger takes care of it. However, what if we want to use the insert only on the nested table parts of the object view as follows benchmark@ORA10G> insert into 2 TABLE 3 ( 4 select c.parts 5 from components_or_view c 6 where c.component_id=1 7 ) 8 values 9 ( 10 1, 7, 'part 17','part 17 description' 11 ); from components_or_view c * ERROR at line 5: ORA-25015: cannot perform DML on this nested table view column As you may have guessed by now, for this insert to work, we need another instead of trigger on insert; this time it will be on the nested table column parts. benchmark@ORA10G> create or replace trigger parts_io_insert 2 instead of insert on nested table parts of components_or_view 3 begin

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SqlConnection cn = new SqlConnection( ConfigurationManager .ConnectionStrings["localPubs"].ConnectionString); SqlCommand cm = new SqlCommand("", cn); foreach (DataRow dr in ds.Tables[0].Rows) { sqlUpdate = ""; sqlWhere = ""; foreach(DataColumn dc in ds.Tables[0].Columns) { if (dr[dc, DataRowVersion.Current] != dr[dc, DataRowVersion.Original]) { sqlUpdate += string.Format("{0} = '{1}', ", dc.ColumnName, dr[dc]); sqlWhere += string.Format(" and {0} = '{1}'", dc.ColumnName, dr[dc, DataRowVersion.Original]); } } if (sqlUpdate.Length > 0) { sqlUpdate = sqlUpdate.Substring (0, sqlUpdate.Length - 2); sql += string.Format(sqlBase, sqlUpdate, dr["au_id", DataRowVersion.Original], sqlWhere); ; } } cm.CommandText = sql; cn.Open(); int updates = cm.ExecuteNonQuery(); cn.Close(); return true; } The next thing to do with this method is to compare the number of rows that were updated to the number of rows that have changed in the DataSet, to make sure no concurrency errors occurred (in the limited definition you ve implemented here). Then the DataSet would need to be refreshed by calling AcceptChanges. if (updates != ds.Tables[0].GetChanges().Rows.Count) return false; else { ds.AcceptChanges();

These conversions are all unchecked in the sense that they will not raise exceptions. Again, the Microsoft.FSharp.Core.Operators.Checked module has corresponding definitions of these operators. An alternative is to use the .NET static methods contained in the type System.Convert, such as System.Convert.ToDouble( ). These do perform checking, which means they raise an exception if the source number can t be represented within the numeric range of the target type. As with many .NET constructs, uses of System.Convert methods may require type annotations to resolve overloading, discussed further in 5 and 6.

-- Insert into the underlying relational child table insert into parts_rel ( component_id, part_id, part_name, part_desc ) values( :new.component_id, :new.part_id, :new.part_name, :new.part_desc ); end; /

return true; } AcceptChanges doesn t move any data to the database (only an adapter can do that); it simply copies current values over original values. The same null checking logic you saw earlier needs to be built into this method as well.

When used with numeric values, the binary comparison operators =, <>, <, <=, >, >=, min, and max perform comparisons according to the natural ordering for each particular numeric type. You can also use these operators on other data types, such as to compare lists of integers, and you can customize their behavior for new types you define. We discuss generic comparison in detail in 5, and we discuss customizing generic comparison in 8. When used with floating-point values, these operators implement the IEEE semantics for NaN (Not a Number) values. For example, (NaN = NaN) is false, as is (NaN <= NaN) and (NaN < NaN).

Trigger created. Now the same insert should work as follows: benchmark@ORA10G> insert into 2 TABLE 3 ( 4 select c.parts 5 from components_or_view c 6 where c.component_id=1 7 ) 8 values 9 ( 10 1, 7, 'part 17','part 17 description' 11 ); 1 row created. We are finished with all triggers required to enable inserts. Next, we ll move on to the topic of enabling deletes.

As before, we begin by trying to delete a part from a given component without having created any triggers: benchmark@ORA10G> delete TABLE 2 ( 3 select c.parts 4 from components_or_view c 5 where c.component_id=1 6 ) t 7 where t.part_id = 1; from components_or_view c * ERROR at line 4: ORA-25015: cannot perform DML on this nested table view column