/// <summary>
/// Finds the trigger that uses a sequence for autonumbering. May return NULL.
/// </summary>
/// <param name="databaseTable">The database table.</param>
/// <returns></returns>
public static OracleSequenceTrigger FindTrigger(DatabaseTable databaseTable)
{
var triggers = databaseTable.Triggers;
if (triggers.Count == 0)
{
return(null);
}
var pk = databaseTable.PrimaryKeyColumn ?? databaseTable.Columns.Find(x => x.IsAutoNumber);
if (pk == null)
{
return(null);
}
//the trigger body will look something like "SELECT MYSEQ.NEXTVAL INTO :NEW.ID FROM DUAL;"
var pattern = ".NEXTVAL\\s+?INTO\\s+?:NEW.\"?" + pk.Name;
var regex = new Regex(pattern, RegexOptions.IgnoreCase);
foreach (var databaseTrigger in databaseTable.Triggers)
{
var body = databaseTrigger.TriggerBody;
var match = regex.Match(body);
if (!match.Success)
{
continue;
}
var result = new OracleSequenceTrigger(databaseTrigger);
//let's write the sequence if we can find it
var seqName = ParseSequenceName(body, match.Index);
if (seqName == null)
{
return(result);
}
result.SequenceName = seqName;
if (databaseTable.DatabaseSchema != null)
{
result.DatabaseSequence = databaseTable.DatabaseSchema.Sequences
.FirstOrDefault(x => seqName.Equals(x.Name, StringComparison.OrdinalIgnoreCase));
}
return(result);
}
return(null);
}
private static void LookForAutoGeneratedId(DatabaseTable databaseTable)
{
var pk = databaseTable.PrimaryKeyColumn;
if (pk == null)
{
return;
}
if (LooksLikeAutoNumberDefaults(pk.DefaultValue))
{
//Oracle 12c default values from sequence
pk.IsAutoNumber = true;
return;
}
var match = OracleSequenceTrigger.FindTrigger(databaseTable);
if (match != null)
{
pk.IsAutoNumber = true;
}
}
