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Executes non-SELECT commands, such as SQL commands that insert, delete, or update records. The returned value indicates the number of rows affected by the command. Executes a SELECT query and returns the value of the first field of the first row from the rowset generated by the command. This method is usually used when executing an aggregate SELECT command that uses functions such as COUNT() or SUM() to calculate a single value. Executes a SELECT query and returns a DataReader object that wraps a read-only, forward-only cursor.

ExecuteScalar()

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Summary

ExecuteReader()

A DataReader allows you to read the data returned by a SELECT command one record at a time, in a forward-only, read-only stream. This is sometimes called a firehose cursor. Using a DataReader is the simplest way to get to your data, but it lacks the sorting and relational abilities of the disconnected DataSet described in 8. However, the DataReader provides the quickest possible no-nonsense access to data. Table 7-5 lists the core methods of the DataReader. Table 7-5. DataReader Methods

Read()

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Advances the row cursor to the next row in the stream. This method must also be called before reading the first row of data. (When the DataReader is first created, the row cursor is positioned just before the first row.) The Read() method returns true if there s another row to be read, or false if it s on the last row. Returns the value stored in the field with the specified column name or index, within the currently selected row. The type of the returned value is the closest .NET match to the native value stored in the data source. If you access the field by index and inadvertently pass an invalid index that refers to a nonexistent field, you will get an IndexOutOfRangeException exception. You can also access the same value by name, which is slightly less efficient because the DataReader must perform a lookup to find the column with the specified name. Saves the values of the current row into an array. The number of fields that are saved depends on the size of the array you pass to this method. You can use the DataReader.FieldCount property to determine the number of fields in a row, and you can use that information to create an array of the right size if you want to save all the fields.

GetValue()

GetValues()

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These methods return the value of the field with the specified index in the current row, with the data type specified in the method name. Note that if you try to assign the returned value to a variable of the wrong type, you ll get an InvalidCastException exception. If the command that generated the DataReader returned more than one rowset, this method moves the pointer to the next rowset (just before the first row). Closes the reader. If the originator command ran a stored procedure that returned an output value, that value can be read only from the respective parameter after the reader has been closed.

NextResult()

Close()

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Specifies the maximum amount of memory in percent of the total memory available on a system that can be used by the worker process If this amount is exceeded, the runtime automatically launches a new process, reassigns requests to this new process, and shuts down the old process But remember, even if you have a system with more than 2 GB of RAM and have configured this setting appropriately, you might get an out-of-memory exception if the process requires more than 2 GB of RAM The reason for that is that the operating system itself by default doesn t allow a process to have more than 2 GB By enabling the so-called 4GB RAM TUNING feature on the operating system, a process can have up to 3 GB of RAM This setting is especially important for multiprocessor environments.

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