public static MySqlColumnDefinition Extract(ColumnDeclarationContext context)
{
if (context == null)
{
return(null);
}
var column = new MySqlColumnDefinition
{
// column name
Name = context.GetColumnName()
};
// check column definitions
var definitionContext = context.GetChild <ColumnDefinitionContext>();
if (definitionContext == null)
{
return(null);
}
// BITINT(20): DimensionDataTypeContext
column.Data = new MySqlColumnDataDefinition();
(column.Data.DataType, column.Data.Length, column.Data.IsUnsigned) = definitionContext.ExtractColumnDataDefinition();
// NOTNULL: NullColumnConstraintContext
var notnull = definitionContext.GetChild <NullColumnConstraintContext>();
column.Data.IsNullable = notnull != null && notnull.GetText() == "NULL"; // ChildCount = 1 not proove null. string compare is guaranteed.
// AUTOINCREMENT: AutoIncrementColumnConstraintContext
var autoincrement = definitionContext.GetChild <AutoIncrementColumnConstraintContext>();
column.AutoIncrement = autoincrement != null;
// DEFAULt'0': DefaultColumnConstraintContext
var defaultValue = definitionContext.GetChild <DefaultColumnConstraintContext>();
column.HasDefault = defaultValue != null;
column.DefaultValue = defaultValue?.GetText()?.RemoveDefaultString();
//MEMO: GeneratedColumnContext will done via Listener
//var generatedColumnConstraintContext = definitionContext.GetChild<GeneratedColumnConstraintContext>();
//columnDefinition.GeneratedColumn = GeneratedColumnDefinition.ExtractGeneratedColumnDefinition(generatedColumnConstraintContext);
//MEMO: ReferenceColumnContext will done via Listener
// Special overwrite for SERIAL DataType.
// SERIAL is an alias for BIGINT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE.
if (column.Data.DataType == "SERIAL")
{
column.Data.IsUnsigned = true;
column.Data.IsNullable = false;
column.AutoIncrement = true;
//MEMO: No action for UniqueKey. It's too much special. (should add unique key clause on sql)
}
return(column);
}
/// <summary>
/// Add Reference between Column -> Key.
/// </summary>
/// <param name="column"></param>
public void AddColumnReference(MySqlColumnDefinition column)
{
if (ColumnReference == null)
{
ColumnReference = new HashSet <MySqlColumnDefinition>();
}
ColumnReference.Add(column);
}
