SqlCommand.DeriveParameters failed

错误信息如下：

SqlCommand.DeriveParameters failed because the SqlCommand.CommandText property value is an invalid multipart name "SELECT * from tableA", the current limit of "4" is insufficient。

错误原因：

使用Enterprise Library进行数据库操作时，如果直接使用sql 语句而非存储过程，一定要用重载方法：
_db.ExecuteDataSet(CommandType type,String sql)

而不是：

public virtual DataSet ExecuteDataSet(
	string storedProcedureName,
	params Object[] parameterValues
)

或者通过sql，获取到DbCommand，再执行：

ExecuteDataSet重载方法如下：

Database.ExecuteDataSet Method (DbCommand)

public virtual DataSet ExecuteDataSet(
	DbCommand command
)

Database.ExecuteDataSet Method (CommandType, String)

public virtual DataSet ExecuteDataSet(
	CommandType commandType,
	string commandText
)

Database.ExecuteDataSet Method (DbCommand, DbTransaction)

public virtual DataSet ExecuteDataSet(
	DbCommand command,
	DbTransaction transaction
)

Database.ExecuteDataSet Method (String, Object[])

public virtual DataSet ExecuteDataSet(
	string storedProcedureName,
	params Object[] parameterValues
)

Database.ExecuteDataSet Method (DbTransaction, CommandType, String)

public virtual DataSet ExecuteDataSet(
	DbTransaction transaction,
	CommandType commandType,
	string commandText
)

Database.ExecuteDataSet Method (DbTransaction, String, Object[])

public virtual DataSet ExecuteDataSet(
	DbTransaction transaction,
	string storedProcedureName,
	params Object[] parameterValues
)