PHP 中的多个结果集？
在 .NET 中，SqlDataReader 可以检索多个记录集：
Dim Connection As New SqlConnection(SomeConnectionString)
'Note that the command will generate three result
Dim Command As New SqlCommand("select '1a', '1b'; " & _
"select '2a', '2b', '2c'; " & _
"select '3a', '3b'; ", Connection)
Dim Reader As SqlDataReader
Connection.Open()
Reader = Command.ExecuteReader
Do
While Reader.Read
'Do something with the data
End While
Loop While (Reader.NextResult) 'Proceed to next result
Reader.Close()
Connection.Close()
.NextResult 将读取器移动到下一个结果。如何在 PHP 中做到这一点？我基本上想避免多次往返数据库。
注意：.Read 此处移动下一行，而 .NextResult 移动到下一个结果。
1 个查询，3 个结果：
结果 1
1a 1b
结果 2
2a 2b 2c
结果 3
3a 3b
注意：行不等于结果。结果更像是一个表或一组行。
In .NET SqlDataReader can retrieve multiple record set:
Dim Connection As New SqlConnection(SomeConnectionString)
'Note that the command will generate three result
Dim Command As New SqlCommand("select '1a', '1b'; " & _
"select '2a', '2b', '2c'; " & _
"select '3a', '3b'; ", Connection)
Dim Reader As SqlDataReader
Connection.Open()
Reader = Command.ExecuteReader
Do
While Reader.Read
'Do something with the data
End While
Loop While (Reader.NextResult) 'Proceed to next result
Reader.Close()
Connection.Close()
The .NextResult moves the reader to the next result. How to do this in PHP? I basically want to avoid many round trips to the database.
Note: .Read here moves the next row while .NextResult moves to the next result.
1 query, 3 results:
result 1
1a 1b
result 2
2a 2b 2c
result 3
3a 3b
Note: Row is not equal to result. Result is much more like a table or set of rows.
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如果您使用 PDO，则可以通过使用 PDOStatement->nextRowset() 来执行此操作。是否支持完全取决于您要连接的数据库以及您使用的 PDO 驱动程序。
You can do this if you are using PDO, by using PDOStatement->nextRowset(). Whether this is supported or not depends entirely on the database you are connecting to, and which PDO driver you use.