private Table LoadFromSchema()
{
// todo 判断是否存在表，表不存在时返回null
List <IColumn> cols = QuerySession.ExecuteSqlString(QuerySession.DatabaseInfo.SqlDialect.SchemaSql, new PropertyEqualColumnMapper <Column>(), tableName).Cast <IColumn>().ToList();
if (cols.Count == 0)
{
return(null);
}
var table = new Table(cols);
table.TableName = tableName;
return(table);
}