protected override IEnumerable <Command> OnDrop(IMetadata sourceMetadata, IMetadata targetMetadata, IComparerContext context)
{
var command = new Command();
if (IsLegacy)
{
command.Append($"DROP EXTERNAL FUNCTION {FunctionName.AsSqlIndentifier()}");
}
else
{
command.Append($"DROP FUNCTION");
if (PackageName != null)
{
command.Append($" {PackageName.AsSqlIndentifier()}.{FunctionName.AsSqlIndentifier()}");
}
else
{
command.Append($" {FunctionName.AsSqlIndentifier()}");
}
}
yield return(command);
}
protected override IEnumerable <Command> OnAlter(IMetadata sourceMetadata, IMetadata targetMetadata, IComparerContext context)
{
if (IsLegacy)
{
var otherFunction = FindOtherChecked(targetMetadata.MetadataFunctions.FunctionsByName, FunctionNameKey, "function");
if (EquatableHelper.PropertiesEqual(this, otherFunction, EquatableProperties, new[] { nameof(ModuleName), nameof(EntryPoint) }))
{
yield return(new Command().Append($"ALTER EXTERNAL FUNCTION {FunctionName.AsSqlIndentifier()} ENTRY_POINT '{SqlHelper.DoubleSingleQuotes(EntryPoint)}' MODULE_NAME '{SqlHelper.DoubleSingleQuotes(ModuleName)}'"));
}
else
{
throw new NotSupportedOnFirebirdException($"Altering function is not supported ({FunctionName}).");
}
}
else
{
foreach (var item in OnCreate(sourceMetadata, targetMetadata, context))
{
yield return(item);
}
}
}
protected override IEnumerable <Command> OnCreate(IMetadata sourceMetadata, IMetadata targetMetadata, IComparerContext context)
{
if (IsLegacy)
{
var command = new Command();
command.Append($"DECLARE EXTERNAL FUNCTION {FunctionName.AsSqlIndentifier()}");
var inputs =
FunctionArguments
.Where(x => x.ArgumentPosition != ReturnArgument)
.OrderBy(x => x.ArgumentPosition)
.Select(CreateLegacyArgumentDefinition);
command.Append($" {string.Join(", ", inputs)}");
command.AppendLine();
var @return = FunctionArguments.First(x => x.ArgumentPosition == ReturnArgument);
command.Append($"RETURNS{(ReturnArgument != 0 ? " PARAMETER" : string.Empty)} {CreateLegacyArgumentDefinition(@return)}");
command.AppendLine();
command.Append($"ENTRY_POINT '{SqlHelper.DoubleSingleQuotes(EntryPoint)}' MODULE_NAME '{SqlHelper.DoubleSingleQuotes(ModuleName)}'");
yield return(command);
}
else
{
var command = SqlHelper.IsValidExternalEngine(this) ? new Command() : new PSqlCommand();
command.Append("CREATE OR ALTER FUNCTION");
if (PackageName != null)
{
command.Append($" {PackageName.AsSqlIndentifier()}.{FunctionName.AsSqlIndentifier()}");
}
else
{
command.Append($" {FunctionName.AsSqlIndentifier()}");
}
var inputs =
FunctionArguments
.Where(x => x.ArgumentPosition != ReturnArgument)
.OrderBy(x => x.ArgumentPosition)
.Select(x => CreateNewArgumentDefinition(x, sourceMetadata, targetMetadata, context));
var @return = FunctionArguments.First(x => x.ArgumentPosition == ReturnArgument);
var output = CreateNewArgumentDefinition(@return, sourceMetadata, targetMetadata, context);
command.Append($" ({string.Join(", ", inputs)}) RETURNS {output}");
if (DeterministicFlag == DeterministicFlagType.Deterministic)
{
command.Append(" DETERMINISTIC");
}
command.AppendLine();
if (SqlHelper.IsValidExternalEngine(this))
{
command.Append($"EXTERNAL NAME '{SqlHelper.DoubleSingleQuotes(EntryPoint)}'");
command.AppendLine();
command.Append($"ENGINE {EngineName.AsSqlIndentifier()}");
}
else
{
if (SqlSecurity != null)
{
command.Append($"SQL SECURITY {SqlHelper.SqlSecurityString(SqlSecurity)}");
command.AppendLine();
}
command.Append("AS");
command.AppendLine();
if (context.EmptyBodiesEnabled)
{
command.Append("BEGIN");
command.AppendLine();
command.Append("END");
}
else
{
command.Append(FunctionSource);
}
}
yield return(command);
}
}
