/// <summary>
/// Produce a valid sql string according to the column properties.
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
private string ProduceNewColumnQuery(ColumnVirtualization.ColumnItem item)
{
string sqlStr, strAllowNull = string.Empty, strPrimaryKey = string.Empty, strIdentity = string.Empty, strLen = string.Empty;
string parsedType; //Stores the type as a string according to database type
string strCompressed = string.Empty;
parsedType = ParseColType2string(item);
//sqlStr += columnNewItem.Name + " " + columnNewItem.Type + columnNewItem.Len + " " + columnNewItem.AllowNull + " " + columnNewItem.PrimaryKey + " " + columnNewItem.Identity;
if (item.Len != null)
{
strLen = "(" + item.Len.ToString() + ")";
}
if (item.Compressed == true)//used in access,default value false.
{
HandleCompressedCol(ref strCompressed);
}
if (item.AllowNull == false)
{
strAllowNull = "not null";
}
if (item.PrimaryKey == true)
{
strPrimaryKey = "primary key";
}
if (item.Identity == true)
{
HandleAutoIncreamentCol(ref strIdentity, ref parsedType);
}
sqlStr = item.Name + " " + parsedType + strLen + " " + strCompressed + " " + strAllowNull + " " + strPrimaryKey + " " + strIdentity;
return(sqlStr);
}
/// <summary>
///
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public virtual string ParseColType2string(ColumnVirtualization.ColumnItem item)
{
string retVal = string.Empty;
switch (item.ColType)
{
case ColumnVirtualization.ColumnType.boolean:
retVal = "Bit";
break;
case ColumnVirtualization.ColumnType.DateTime:
retVal = "DateTime";
break;
}
return(retVal);
}
public override string ParseColType2string(ColumnVirtualization.ColumnItem item)
{
string retVal = string.Empty;
switch (item.ColType)
{
case ColumnVirtualization.ColumnType.String:
retVal = "Text";
break;
case ColumnVirtualization.ColumnType.Byte:
retVal = "Byte";
break;
case ColumnVirtualization.ColumnType.Int:
retVal = "smallint";
break;
case ColumnVirtualization.ColumnType.LongInteger:
retVal = "integer";
break;
case ColumnVirtualization.ColumnType.Single:
retVal = "single";
break;
case ColumnVirtualization.ColumnType.Double:
retVal = "double";
break;
case ColumnVirtualization.ColumnType.Memo: //#9366 - added new type
retVal = "MEMO";
break;
//case ColumnVirtualization.ColumnType.AutoNumber:
// retVal = "AUTOINCREMENT";
// break;
default:
retVal = base.ParseColType2string(item);
break;
}
return(retVal);
}
