public override SqlFragment Visit(DbArithmeticExpression expression)
{
if (expression.ExpressionKind == DbExpressionKind.UnaryMinus)
{
ListFragment f = new ListFragment();
f.Append("-(");
f.Append(expression.Arguments[0].Accept(this));
f.Append(")");
return(f);
}
string op = String.Empty;
switch (expression.ExpressionKind)
{
case DbExpressionKind.Divide:
op = "/"; break;
case DbExpressionKind.Minus:
op = "-"; break;
case DbExpressionKind.Modulo:
op = "%"; break;
case DbExpressionKind.Multiply:
op = "*"; break;
case DbExpressionKind.Plus:
op = "+"; break;
default:
throw new NotSupportedException();
}
return(VisitBinaryExpression(expression.Arguments[0], expression.Arguments[1], op));
}
protected override SelectStatement GenerateReturningSql(DbModificationCommandTree tree, DbExpression returning)
{
SelectStatement select = base.GenerateReturningSql(tree, returning);
ListFragment where = new ListFragment();
where.Append(" row_count() = 1 and (");
where.Append(((DbUpdateCommandTree)tree).Predicate.Accept(this));
where.Append(")");
select.Where = where;
return(select);
}
protected virtual SelectStatement GenerateReturningSql(DbModificationCommandTree tree, DbExpression returning)
{
SelectStatement select = new SelectStatement(this);
Debug.Assert(returning is DbNewInstanceExpression);
VisitNewInstanceExpression(select, returning as DbNewInstanceExpression);
select.From = (InputFragment)tree.Target.Expression.Accept(this);
ListFragment where = new ListFragment();
select.Where = where;
return(select);
}
protected virtual SelectStatement GenerateReturningSql(DbModificationCommandTree tree, DbExpression returning)
{
SelectStatement select = base.GenerateReturningSql(tree, returning);
ListFragment where = new ListFragment();
EntitySetBase table = ((DbScanExpression)tree.Target.Expression).Target;
bool foundIdentity = false;
where.Append(" row_count() > 0");
foreach (EdmMember keyMember in table.ElementType.KeyMembers)
{
SqlFragment value;
if (!values.TryGetValue(keyMember, out value))
{
if (foundIdentity)
{
throw new NotSupportedException();
}
foundIdentity = true;
PrimitiveTypeKind type = ((PrimitiveType)keyMember.TypeUsage.EdmType.BaseType).PrimitiveTypeKind;
if ((type == PrimitiveTypeKind.Byte) || (type == PrimitiveTypeKind.SByte) ||
(type == PrimitiveTypeKind.Int16) || (type == PrimitiveTypeKind.Int32) ||
(type == PrimitiveTypeKind.Int64) || (type == PrimitiveTypeKind.Decimal && IsValidMySqlDataType(keyMember.TypeUsage.EdmType.FullName)))
{
value = new LiteralFragment("last_insert_id()");
}
else if (keyMember.TypeUsage.EdmType.BaseType.Name == "Guid")
{
value = new LiteralFragment(string.Format("ANY(SELECT guid FROM tmpIdentity_{0})", (table as MetadataItem).MetadataProperties["Table"].Value));
}
}
where.Append(String.Format(" AND `{0}`=", keyMember));
where.Append(value);
}
select.Where = where;
return(select);
}
private SqlFragment UserDefinedFunction(DbFunctionExpression e)
{
FunctionFragment f = new FunctionFragment();
f.Name = Metadata.TryGetValueMetadataProperty <string>(e.Function,
"StoreFunctionNameAttribute");
if (String.IsNullOrEmpty(f.Name))
{
f.Name = e.Function.Name;
}
f.Quoted = !Metadata.TryGetValueMetadataProperty <bool>(e.Function, "BuiltInAttribute");
bool isFuncNiladic = Metadata.TryGetValueMetadataProperty <bool>(e.Function, "NiladicFunctionAttribute");
if (isFuncNiladic && e.Arguments.Count > 0)
{
throw new InvalidOperationException("Niladic functions cannot have parameters");
}
ListFragment list = new ListFragment();
string delimiter = "";
foreach (DbExpression arg in e.Arguments)
{
if (delimiter.Length > 0)
{
list.Append(new LiteralFragment(delimiter));
}
list.Append(arg.Accept(callingGenerator));
delimiter = ", ";
}
f.Argument = list;
return(f);
}
public void Visit(ListFragment f)
{
}
