public override SQLiteParseTreeNode VisitTable_constraint__foreign_key_constraint(SQLiteParserSimpleParser.Table_constraint__foreign_key_constraintContext context)
{
var ret = new TableConstraintForeignKeyNode(context)
{
FieldNames = context.table_constraint__parens_field_list()
.foreign_key_clause__column_list()
.id()
.Select(i => i.GetText())
.ToList(),
ForeignKeyClauseNode = context.foreign_key_clause().Accept(this) as ForeignKeyClauseNode
};
return(ret);
}
public StringBuilder Visit(TableConstraintForeignKeyNode tableConstraintForeignKeyNode)
{
var sb = new StringBuilder();
AppendConstraint(tableConstraintForeignKeyNode, sb);
sb.Append("FOREIGN KEY (");
sb.Append(string.Join(", ", tableConstraintForeignKeyNode.FieldNames));
sb.Append(") ");
if (tableConstraintForeignKeyNode.ForeignKeyClauseNode != null)
{
sb.Append(tableConstraintForeignKeyNode.ForeignKeyClauseNode.Accept(this));
}
return(sb);
}
private CreateTableNode IncorporateAlterationsInCreateNode(AlterTableCommand command,
CreateTableNode createTableNode)
{
foreach (TableCommand alterCommand in command.TableCommands)
{
if (alterCommand is AddColumnCommand)
{
var addColumn = alterCommand as AddColumnCommand;
createTableNode.ColumnDefinitions.Add(addColumn.CreateColumnDefNode());
}
else if (alterCommand is DropColumnCommand)
{
var dropColumn = alterCommand as DropColumnCommand;
ColumnDefNode result =
createTableNode.ColumnDefinitions.FirstOrDefault(i => i.ColumnName == dropColumn.ColumnName);
if (result == null)
{
//bad!!
throw new InvalidColumnException <DropColumnCommand>(String.Format("Altering column {0} failed. No such column exists on table {1}.", dropColumn.ColumnName, dropColumn.TableName), dropColumn);
}
else
{
//remove our column
createTableNode.ColumnDefinitions.Remove(result);
}
}
else if (alterCommand is AlterColumnCommand)
{
var alterColumn = alterCommand as AlterColumnCommand;
ColumnDefNode columnDef =
createTableNode.ColumnDefinitions.FirstOrDefault(i => i.ColumnName == alterColumn.ColumnName);
if (columnDef == null)
{
//throw!!!!
throw new InvalidColumnException <AlterColumnCommand>(String.Format("Altering column {0} failed. No such column exists on table {1}.", alterColumn.ColumnName, alterColumn.TableName), alterColumn);
}
//modify the type name
if (!String.IsNullOrEmpty(alterColumn.DbType))
{
columnDef.TypeNameNode = SQLiteParseVisitor.ParseString <TypeNameNode>(alterColumn.DbType,
i => i.type_name());
}
if (alterColumn.Default != null)
{
//modify the default
DefaultConstraintNode defaultConstraint =
columnDef.ColumnConstraints.OfType <DefaultConstraintNode>().FirstOrDefault();
if (defaultConstraint == null)
{
//we'll create our own
defaultConstraint = new DefaultConstraintNode
{
Value = DbUtils.ConvertToSqlValue(alterColumn.Default)
};
//and add it!
columnDef.ColumnConstraints.Add(defaultConstraint);
}
else
{
//we modify the one that exists
defaultConstraint.Value = DbUtils.ConvertToSqlValue(alterColumn.Default);
}
}
}
else if (alterCommand is CreateForeignKeyCommand)
{
var foreignKeyCommand = alterCommand as CreateForeignKeyCommand;
var keyNode = new TableConstraintForeignKeyNode
{
FieldNames = foreignKeyCommand.SrcColumns,
ConstraintName = foreignKeyCommand.Name,
ForeignKeyClauseNode = new ForeignKeyClauseNode
{
TableName = foreignKeyCommand.DestTable,
FieldList = foreignKeyCommand.DestColumns,
ForeignDeferrable = new ForeignDeferrableNode().SetToTrulyDeferrable()
}
};
createTableNode.TableConstraints.Add(keyNode);
}
else if (alterCommand is DropForeignKeyCommand)
{
var foreignKeyCommand = alterCommand as DropForeignKeyCommand;
TableConstraintForeignKeyNode foreignKeyDrop = createTableNode.TableConstraints
.OfType <TableConstraintForeignKeyNode>()
.FirstOrDefault(n => n.ConstraintName == foreignKeyCommand.Name);
if (foreignKeyDrop == null)
{
throw new InvalidForeignKeyException(String.Format("No foreign key {0} exists.", foreignKeyCommand.Name), foreignKeyCommand);
}
createTableNode.TableConstraints.Remove(foreignKeyDrop);
}
}
return(createTableNode);
}
