public static DataTable DeriveSchemaTable(FeatureDataTable table,
ColumnLengthComputationDelegate lengthComputationDelegate,
ColumnPrecisionComputationDelegate precisionComputationDelegate,
ColumnScaleComputationDelegate scaleComputationDelegate)
{
DataTable schema = CreateSchemaTable();
foreach (DataColumn column in table.Columns)
{
DataColumn[] keyColumns = table.PrimaryKey ?? new DataColumn[] { };
Int32 length = column.ExtendedProperties.ContainsKey(LengthExtendedProperty)
? Convert.ToInt32(column.ExtendedProperties[LengthExtendedProperty])
: (lengthComputationDelegate == null) ? 0 : lengthComputationDelegate(column);
Int16 precision = column.ExtendedProperties.ContainsKey(NumericPrecisionExtendedProperty)
? Convert.ToInt16(column.ExtendedProperties[NumericPrecisionExtendedProperty])
: (precisionComputationDelegate == null) ? (Int16)0 : precisionComputationDelegate(column);
Int16 scale = column.ExtendedProperties.ContainsKey(NumericScaleExtendedProperty)
? Convert.ToInt16(column.ExtendedProperties[NumericScaleExtendedProperty])
: (scaleComputationDelegate == null) ? (Int16)0 : scaleComputationDelegate(column);
schema.Rows.Add(
column.ColumnName,
length,
column.Ordinal,
precision,
scale,
column.DataType,
column.AllowDBNull,
column.ReadOnly,
column.Unique,
Array.Exists(keyColumns, delegate(DataColumn col) { return(col == column); }),
column.AutoIncrement,
false);
}
return(schema);
}
public static DataTable DeriveSchemaTable(FeatureDataTable table,
ColumnLengthComputationDelegate lengthComputationDelegate,
ColumnPrecisionComputationDelegate precisionComputationDelegate,
ColumnScaleComputationDelegate scaleComputationDelegate)
{
DataTable schema = CreateSchemaTable();
foreach (DataColumn column in table.Columns)
{
DataColumn[] keyColumns = table.PrimaryKey ?? new DataColumn[] { };
int length = column.ExtendedProperties.ContainsKey(LengthExtendedProperty)
? Convert.ToInt32(column.ExtendedProperties[LengthExtendedProperty])
: (lengthComputationDelegate == null) ? 0 : lengthComputationDelegate(column);
short precision = column.ExtendedProperties.ContainsKey(NumericPrecisionExtendedProperty)
? Convert.ToInt16(column.ExtendedProperties[NumericPrecisionExtendedProperty])
: (precisionComputationDelegate == null) ? (short)0 : precisionComputationDelegate(column);
short scale = column.ExtendedProperties.ContainsKey(NumericScaleExtendedProperty)
? Convert.ToInt16(column.ExtendedProperties[NumericScaleExtendedProperty])
: (scaleComputationDelegate == null) ? (short)0 : scaleComputationDelegate(column);
#if !CFBuild
schema.Rows.Add(
column.ColumnName,
length,
column.Ordinal,
precision,
scale,
column.DataType,
column.AllowDBNull,
column.ReadOnly,
column.Unique,
Array.Exists(keyColumns, delegate(DataColumn col) { return col == column; }),
column.AutoIncrement,
false);
#else //The Predicate is a delegate to a method that returns true if the object passed to it
//matches the conditions defined in the delegate. The elements of array are individually
//passed to the Predicate, and processing is stopped when a match is found.
bool isKey = false;
foreach (DataColumn col in keyColumns)
{
if (col == column)
{
isKey = true;
break;
}
}
schema.Rows.Add(
column.ColumnName,
length,
column.Ordinal,
precision,
scale,
column.DataType,
column.AllowDBNull,
column.ReadOnly,
column.Unique,
isKey,
column.AutoIncrement,
false);
#endif
}
return schema;
}
public static DataTable DeriveSchemaTable(FeatureDataTable table,
ColumnLengthComputationDelegate lengthComputationDelegate,
ColumnPrecisionComputationDelegate precisionComputationDelegate,
ColumnScaleComputationDelegate scaleComputationDelegate)
{
DataTable schema = CreateSchemaTable();
foreach (DataColumn column in table.Columns)
{
DataColumn[] keyColumns = table.PrimaryKey ?? new DataColumn[] { };
Int32 length = column.ExtendedProperties.ContainsKey(LengthExtendedProperty)
? Convert.ToInt32(column.ExtendedProperties[LengthExtendedProperty])
: (lengthComputationDelegate == null) ? 0 : lengthComputationDelegate(column);
Int16 precision = column.ExtendedProperties.ContainsKey(NumericPrecisionExtendedProperty)
? Convert.ToInt16(column.ExtendedProperties[NumericPrecisionExtendedProperty])
: (precisionComputationDelegate == null) ? (Int16)0 : precisionComputationDelegate(column);
Int16 scale = column.ExtendedProperties.ContainsKey(NumericScaleExtendedProperty)
? Convert.ToInt16(column.ExtendedProperties[NumericScaleExtendedProperty])
: (scaleComputationDelegate == null) ? (Int16)0 : scaleComputationDelegate(column);
schema.Rows.Add(
column.ColumnName,
length,
column.Ordinal,
precision,
scale,
column.DataType,
column.AllowDBNull,
column.ReadOnly,
column.Unique,
Array.Exists(keyColumns, delegate(DataColumn col) { return col == column; }),
column.AutoIncrement,
false);
}
return schema;
}
