public DataTable LoadColumns(string cn, string tableName)
{
DataTable metaData = new DataTable();
metaData.Columns.Add("TABLE_NAME", Type.GetType("System.String"));
metaData.Columns.Add("COLUMN_NAME", Type.GetType("System.String"));
metaData.Columns.Add("ORDINAL_POSITION", Type.GetType("System.Int32"));
metaData.Columns.Add("IS_NULLABLE", Type.GetType("System.Boolean"));
metaData.Columns.Add("COLUMN_HASDEFAULT", Type.GetType("System.Boolean"));
metaData.Columns.Add("COLUMN_DEFAULT", Type.GetType("System.String"));
metaData.Columns.Add("IS_AUTO_KEY", Type.GetType("System.Boolean"));
metaData.Columns.Add("AUTO_KEY_SEED", Type.GetType("System.Int32"));
metaData.Columns.Add("AUTO_KEY_INCREMENT", Type.GetType("System.Int32"));
metaData.Columns.Add("DATA_TYPE_NAME", Type.GetType("System.String"));
metaData.Columns.Add("NUMERIC_PRECISION", Type.GetType("System.Int32"));
metaData.Columns.Add("NUMERIC_SCALE", Type.GetType("System.Int32"));
metaData.Columns.Add("CHARACTER_MAXIMUM_LENGTH", Type.GetType("System.Int32"));
metaData.Columns.Add("CHARACTER_OCTET_LENGTH", Type.GetType("System.Int32"));
metaData.Columns.Add("DESCRIPTION", Type.GetType("System.String"));
metaData.Columns.Add("IS_PRIMARY_KEY", Type.GetType("System.Boolean"));
try
{
Provider.VistaDB.VistaDBDatabase db = OpenDatabase(cn);
db.Connect();
Provider.VistaDB.VistaDBTable table = new Provider.VistaDB.VistaDBTable(db, tableName);
table.Open();
for (int ordinal = 0; ordinal < table.ColumnCount(); ordinal++)
{
Provider.VistaDB.VistaDBColumn c = table.Columns[ordinal];
bool b = false;
string colName = c.Name;
string def = table.GetDefaultValue(colName, out b);
int width = c.ColumnWidth;
int dec = c.ColumnDecimals;
int length = 0;
int octLength = width;
if (c.Identity)
{
// While I'll see their point this is not typically how it is done
def = "";
}
string type = c.VistaDBType.ToString();
switch (type)
{
case "Character":
case "Varchar":
length = width;
width = 0;
dec = 0;
break;
case "Currency":
case "Double":
break;
default:
width = 0;
dec = 0;
break;
}
metaData.Rows.Add(new object[]
{
table.TableName,
c.Name,
ordinal,
c.AllowNull,
def == string.Empty ? false : true,
def,
c.Identity,
1,
(int)c.IdentityStep,
c.VistaDBType.ToString(),
width,
dec,
length,
octLength,
c.ColumnDescription,
c.PrimaryKey
});
}
table.Close();
db.Close();
}
catch {}
return(metaData);
}
private void CreateColumnInfo()
{
int columnCount;
VistaDBColumn column;
StringBuilder name;
StringBuilder caption;
string nameS;
string captionS;
string dataType;
VistaDBType netDataType;
bool reservedWord;
StringBuilder seed;
string seedS;
double step = 0;
bool packed, hidden, encrypted, unicode;
columns = new Hashtable();
columnsInfo = new ArrayList();
columnCount = VistaDBAPI.ivdb_ColumnCount();
for(int i = 0; i < columnCount; i++)
{
name = new StringBuilder(VistaDBAPI.MAX_STRING_SIZE);
VistaDBAPI.ivdb_ColumnNameManaged((ushort)(i + 1), name, VistaDBAPI.MAX_STRING_SIZE);
nameS = VistaDBAPI.CutString(name);
caption = new StringBuilder(VistaDBAPI.MAX_STRING_SIZE);
VistaDBAPI.ivdb_GetColumnCaptionManaged(nameS, caption, VistaDBAPI.MAX_STRING_SIZE);
captionS = VistaDBAPI.CutString(caption);
dataType = "";
dataType += (char)((byte)(VistaDBAPI.ivdb_ColumnTypeManaged(nameS)));
netDataType = VistaDBAPI.NetDataType(dataType);
reservedWord = VistaDBAPI.ivsql_IsReservedWord(nameS);
seed = new StringBuilder(VistaDBAPI.MAX_STRING_SIZE);
VistaDBAPI.ivdb_GetIdentityManaged(nameS, ref step, seed, VistaDBAPI.MAX_STRING_SIZE);
seedS = VistaDBAPI.CutString(seed);
packed = VistaDBAPI.ivdb_ColumnCompressed(nameS);
hidden = VistaDBAPI.ivdb_ColumnHidden(nameS);
encrypted = VistaDBAPI.ivdb_ColumnEncrypted(nameS);
unicode = VistaDBAPI.ivdb_ColumnUnicode(nameS);
column = new VistaDBColumn(nameS, netDataType, VistaDBAPI.ivdb_ColumnWidth(nameS),
(short)VistaDBAPI.ivdb_ColumnWidth(nameS), (short)VistaDBAPI.ivdb_ColumnDecimals(nameS),
!VistaDBAPI.ivdb_ColumnRequired(nameS), VistaDBAPI.ivdb_ColumnReadOnly(nameS),
VistaDBAPI.ivdb_ColumnIndexed(nameS, true),
VistaDBAPI.ivdb_ColumnIndexed(nameS, true), seedS.Length > 0,
step, seedS, captionS, VistaDBAPI.ivdb_GetColumnDescription(nameS), reservedWord,
packed, hidden, encrypted, unicode);
columns.Add(column.Name.ToUpper(), i);
columnsInfo.Add(column);
}
}
