Data
Definition
Namespace: Extreme.Data
Assembly: Extreme.Data (in Extreme.Data.dll) Version: 3.2.0
Assembly: Extreme.Data (in Extreme.Data.dll) Version: 3.2.0
Overload List
| Read | Reads a data frame from a data reader. |
| Read | Reads the specified columns from a data reader and returns them as a data frame. |
| Read | Reads a data frame from a data reader and uses the specified column as row keys. |
| Read | Reads the specified columns from a data reader and returns them as a data frame using the specified column as row keys. |
ReadDataFrame(IDataReader, Int32)
Reads a data frame from a data reader.
public static DataFrame<long, string> ReadDataFrame(
this IDataReader reader,
int capacity = 1000
)Parameters
- reader IDataReader
- An IDataReader.
- capacity Int32 (Optional)
- Optional. The initial capacity for the data frame.
Return Value
DataFrame<Int64, String>The data frame read from reader.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IDataReader. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).Remarks
Optimal performance is achieved when capacity is equal to the number of rows in the data frame.
ReadDataFrame(IDataReader, IEnumerable<String>, Int32)
Reads the specified columns from a data reader and returns them
as a data frame.
public static DataFrame<long, string> ReadDataFrame(
this IDataReader reader,
IEnumerable<string> columnKeys,
int capacity = 1000
)Parameters
- reader IDataReader
- An IDataReader.
- columnKeys IEnumerable<String>
- A sequence of column names.
- capacity Int32 (Optional)
- The initial capacity for the data frame.
Return Value
DataFrame<Int64, String>The data frame read from reader.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IDataReader. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).Remarks
Optimal performance is achieved when capacity is equal to the number of rows in the data frame.
ReadDataFrame<R>(IDataReader, String, Int32, Boolean)
Reads a data frame from a data reader and uses the specified column
as row keys.
public static DataFrame<R, string> ReadDataFrame<R>(
this IDataReader reader,
string keyColumn,
int capacity = 1000,
bool dropKeyColumn = true
)
Parameters
- reader IDataReader
- An IDataReader.
- keyColumn String
- The name of the column that contains the row index values.
- capacity Int32 (Optional)
- Optional. The initial capacity for the data frame.
- dropKeyColumn Boolean (Optional)
- Optional. Specifies whether the key column should be removed from the data frame. The default is true.
Type Parameters
- R
- The element type of the row index.
Return Value
DataFrame<R, String>The data frame with the specified columns read from reader.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IDataReader. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).Remarks
Optimal performance is achieved when capacity is equal to the number of rows in the data frame.
ReadDataFrame<R>(IDataReader, String, IEnumerable<String>, Int32, Boolean)
Reads the specified columns from a data reader and returns them
as a data frame using the specified column as row keys.
public static DataFrame<R, string> ReadDataFrame<R>(
this IDataReader reader,
string keyColumn,
IEnumerable<string> columnKeys,
int capacity = 1000,
bool dropKeyColumn = true
)
Parameters
- reader IDataReader
- An IDataReader.
- keyColumn String
- The name of the column that contains the row index values.
- columnKeys IEnumerable<String>
- A sequence of column names.
- capacity Int32 (Optional)
- Optional. The initial capacity for the data frame.
- dropKeyColumn Boolean (Optional)
- Optional. Specifies whether the key column should be removed from the data frame. The default is true.
Type Parameters
- R
- The element type of the row index.
Return Value
DataFrame<R, String>The data frame with the columns specified by columnKeys read from reader.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IDataReader. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).Remarks
Optimal performance is achieved when capacity is equal to the number of rows in the data frame.