public static List <TableColumn> BuildTableColumns(List <Column> columns, string tableName)
{
var list = new List <TableColumn>();
foreach (var item in columns)
{
var col = new TableColumn
{
AllowNull = item.IsNullable == YesNoOption.YES,
DataType = item.DataType,
DefaultValue = item.ColumnDefault,
Identity = item.AutoIncrementBy > 1,
Name = item.ColumnName,
Precision = byte.Parse(item.NumericPrecision.ToString()),
//TODO Detect!
PrimaryKey = false,
Scale = byte.Parse(item.NumericScale.ToString())
};
short colLength;
if (short.TryParse(item.CharacterMaxLength.ToString(), out colLength))
{
col.Length = colLength;
}
if (TableDataType.IsLengthFixed(item.DataType))
{
col.Length = TableDataType.GetDefaultLength(item.DataType);
}
list.Add(col);
}
return(list);
}
public static string ValidateColumns(List <TableColumn> columns)
{
foreach (var item in columns)
{
if (string.IsNullOrEmpty(item.DataType))
{
return("Data type is required");
}
if (string.IsNullOrEmpty(item.Name))
{
return("Column name is required");
}
if (!TableDataType.IsLengthFixed(item.DataType))
{
if (item.Length < TableDataType.GetMinLength(item.DataType) ||
item.Length > TableDataType.GetMaxLength(item.DataType))
{
return(string.Format("Column length of colum {0} must be between {1} and {2}",
item.Name, TableDataType.GetMinLength(item.DataType), TableDataType.GetMaxLength(item.DataType)));
}
}
//Check for duplicates
if (columns.Select(x => x.Name).ToList()
.GroupBy(x => x)
.Where(x => x.Count() > 1)
.Select(x => x.Key).ToList().Count > 0)
{
return("Duplicate column names not allowed");
}
//Check for only 1 identity column
var identityCols = columns.Where(x => x.Identity).ToList();
if (identityCols.Count > 1)
{
return("Only a single Identity column allowed");
}
if (item.DataType == "numeric")
{
if (item.Precision < 1)
{
return(string.Format("numeric precision of column {0} must be at least 1", item.Name));
}
if (item.Scale > item.Precision)
{
return(string.Format("numeric scale of column {0} cannot be higher than the precision", item.Name));
}
if (item.Precision > 38)
{
return(string.Format("numeric precision of column {0} cannot be higher than 38", item.Name));
}
if (item.Scale > 38)
{
return(string.Format("numeric scale of column {0} cannot be higher than 38", item.Name));
}
}
}
return(string.Empty);
}
