public void Execute(ICollection <DatabaseFunction> baseFunctions, ICollection <DatabaseFunction> compareFunctions)
{
bool first = false;
//find new functions (in compare, but not in base)
foreach (var function in compareFunctions)
{
var name = function.Name;
var schema = function.SchemaOwner;
var match = baseFunctions.FirstOrDefault(t => t.Name == name && t.SchemaOwner == schema);
if (match != null)
{
continue;
}
var script = string.Empty;
if (!first)
{
first = true;
//CREATE FUNCTION cannot be combined with other statements in a batch,
//so be preceeded by and terminate with a "GO" (sqlServer) or "/" (Oracle)
if (_results.Count > 0)
{
script += _writer.RunStatements() + Environment.NewLine;
}
}
script += "-- NEW FUNCTION " + function.Name + Environment.NewLine +
_writer.AddFunction(function);
CreateResult(ResultType.Add, function, script);
}
//find dropped and existing functions
foreach (var function in baseFunctions)
{
var name = function.Name;
var schema = function.SchemaOwner;
var match = compareFunctions.FirstOrDefault(t => t.Name == name && t.SchemaOwner == schema);
if (match == null)
{
CreateResult(ResultType.Delete, function, "-- DROP FUNCTION " + function.Name + Environment.NewLine +
_writer.DropFunction(function));
continue;
}
//functions may or may not have been changed
if (function.Sql == match.Sql)
{
continue; //the same
}
//a sanitized comparison
if (_writer.CompareProcedure(function.Sql, match.Sql))
{
continue;
}
//in Oracle could be a CREATE OR REPLACE
CreateResult(ResultType.Change, function, "-- ALTER FUNCTION " + function.Name + Environment.NewLine +
_writer.DropFunction(function) + Environment.NewLine +
_writer.AddFunction(match));
}
}