private void ReadAssignment(SetStatement statement)
{
var parser = new ExpressionParser(Tokenizer);
statement.Assignment = parser.Execute();
}
private void ProcessFieldDefinition()
{
Nullability nullability = Nullability.Nullable;
bool isPrimaryKey = false;
Identity identity = null;
string fieldName = GetIdentifier();
SqlType type = ProcessType();
if (type == null)
{
FieldDefinition calcExpression = new FieldDefinition
{
Name = fieldName, Nullability = Nullability.Nullable, Type = null
};
ExpressionParser parser = new ExpressionParser(Tokenizer);
calcExpression.CalculatedValue = parser.Execute();
_statement.Fields.Add(calcExpression);
return;
}
if (Tokenizer.TokenEquals(Constants.Identity))
{
identity = ProcessIdentity();
}
if (Tokenizer.TokenEquals(Constants.Collate))
{
type.Collation = CurrentToken;
ReadNextToken();
}
if (Tokenizer.TokenEquals(Constants.Null))
{
nullability = Nullability.Nullable;
}
if (Tokenizer.TokenEquals(Constants.Not))
{
Tokenizer.ExpectToken(Constants.Null);
nullability = Nullability.NotNullable;
}
if (Tokenizer.TokenEquals(Constants.Identity))
{
identity = ProcessIdentity();
}
if (Tokenizer.TokenEquals(Constants.Primary))
{
Tokenizer.ExpectToken(Constants.Key);
nullability = Nullability.NotNullable;
isPrimaryKey = true;
}
if (Tokenizer.TokenEquals(Constants.Constraint))
{
// TODO: process column constraint
string name = GetIdentifier();
Tokenizer.ExpectToken(Constants.Default);
using (Tokenizer.ExpectBrackets())
{
Expression expression = ProcessExpression();
string defaultValue = expression.Value;
}
}
if (Tokenizer.TokenEquals(Constants.Default))
{
// TODO: process column constraint
Expression expression = ProcessExpression();
string defaultValue = expression.Value;
}
_statement.Fields.Add(
new FieldDefinition
{
Name = fieldName,
Type = type,
Nullability = nullability,
IsPrimaryKey = isPrimaryKey,
Identity = identity
}
);
}
