internal static string GenerateInsertSql(DbInsertCommandTree tree, out List<DbParameter> parameters)
{
StringBuilder commandText = new StringBuilder(CommandTextBuilderInitialCapacity);
ExpressionTranslator translator = new ExpressionTranslator(commandText, tree, null != tree.Returning);
bool first = true;
commandText.Append("INSERT INTO ");
tree.Target.Expression.Accept(translator);
// (c1, c2, c3, ...)
commandText.Append("(");
foreach (DbSetClause setClause in tree.SetClauses)
{
if (first)
{
first = false;
}
else
{
commandText.Append(", ");
}
setClause.Property.Accept(translator);
}
commandText.AppendLine(")");
// values c1, c2, ...
first = true;
commandText.Append("VALUES (");
foreach (DbSetClause setClause in tree.SetClauses)
{
if (first)
{
first = false;
}
else
{
commandText.Append(", ");
}
setClause.Value.Accept(translator);
translator.RegisterMemberValue(setClause.Property, setClause.Value);
}
commandText.AppendLine(")");
parameters = translator.Parameters;
return commandText.ToString();
}
internal static string GenerateDeleteSql(DbDeleteCommandTree tree, out List<DbParameter> parameters)
{
StringBuilder commandText = new StringBuilder(CommandTextBuilderInitialCapacity);
ExpressionTranslator translator = new ExpressionTranslator(commandText, tree, false);
commandText.Append("DELETE FROM ");
tree.Target.Expression.Accept(translator);
commandText.AppendLine();
// where c1 = ... AND c2 = ...
commandText.Append("WHERE ");
tree.Predicate.Accept(translator);
parameters = translator.Parameters;
return commandText.ToString();
}
internal static string GenerateUpdateSql(DbUpdateCommandTree tree, out List<DbParameter> parameters)
{
StringBuilder commandText = new StringBuilder(CommandTextBuilderInitialCapacity);
ExpressionTranslator translator = new ExpressionTranslator(commandText, tree, null != tree.Returning);
bool first = true;
commandText.Append("UPDATE ");
tree.Target.Expression.Accept(translator);
commandText.AppendLine();
// set c1 = ..., c2 = ..., ...
commandText.Append("SET ");
foreach (DbSetClause setClause in tree.SetClauses)
{
if (first)
{
first = false;
}
else
{
commandText.Append(", ");
}
setClause.Property.Accept(translator);
commandText.Append(" = ");
setClause.Value.Accept(translator);
translator.RegisterMemberValue(setClause.Property, setClause.Value);
}
if (first)
{
// If first is still true, it indicates there were no set
// clauses. Introduce a fake set clause so that:
// - we acquire the appropriate locks
// - server-gen columns (e.g. timestamp) get recomputed
EntitySetBase table = ((DbScanExpression)tree.Target.Expression).Target;
// hope this column isn't indexed to not waste power
EdmMember someColumn = table.ElementType.Members.Last(x => !MetadataHelpers.IsStoreGenerated(x));
commandText.AppendFormat("{0} = {0}", GenerateMemberSql(someColumn));
}
commandText.AppendLine();
// where c1 = ..., c2 = ...
commandText.Append("WHERE ");
tree.Predicate.Accept(translator);
commandText.AppendLine();
parameters = translator.Parameters;
return commandText.ToString();
}
