PHP 7.2.0 Release Candidate 4 Released

sqlite_unbuffered_query

SQLiteDatabase::unbufferedQuery

(PHP 5 < 5.4.0, PECL sqlite >= 1.0.0)

sqlite_unbuffered_query -- SQLiteDatabase::unbufferedQueryExecute a query that does not prefetch and buffer all data

说明

resource sqlite_unbuffered_query ( resource $dbhandle , string $query [, int $result_type = SQLITE_BOTH [, string &$error_msg ]] )
resource sqlite_unbuffered_query ( string $query , resource $dbhandle [, int $result_type = SQLITE_BOTH [, string &$error_msg ]] )

面向对象风格 (method):

public SQLiteUnbuffered SQLiteDatabase::unbufferedQuery ( string $query [, int $result_type = SQLITE_BOTH [, string &$error_msg ]] )

sqlite_unbuffered_query() is identical to sqlite_query() except that the result that is returned is a sequential forward-only result set that can only be used to read each row, one after the other.

This function is ideal for generating things such as HTML tables where you only need to process one row at a time and don't need to randomly access the row data.

Note:

Functions such as sqlite_seek(), sqlite_rewind(), sqlite_next(), sqlite_current(), and sqlite_num_rows() do not work on result handles returned from sqlite_unbuffered_query().

参数

dbhandle

The SQLite Database resource; returned from sqlite_open() when used procedurally. This parameter is not required when using the object-oriented method.

query

The query to be executed.

Data inside the query should be properly escaped.

result_type

可选的 result_type 参数接受常量,且决定返回的数组如何被索引。使用 SQLITE_ASSOC 会仅返回关联索引(已命名字段),而 SQLITE_NUM 会仅返回数值索引。SQLITE_BOTH 会同时返回关联和数值索引。SQLITE_BOTH 是此函数的默认值。

error_msg

The specified variable will be filled if an error occurs. This is specially important because SQL syntax errors can't be fetched using the sqlite_last_error() function.

Note: 为兼容其他数据库扩展(比如 MySQL),支持两种可替代的语法。推荐第一种格式,函数的第一个参数是dbhandle

返回值

Returns a result handle 或者在失败时返回 FALSE.

sqlite_unbuffered_query() returns a sequential forward-only result set that can only be used to read each row, one after the other.

更新日志

版本 说明
5.1.0 Added the error_msg parameter

参见

  • sqlite_query() - Executes a query against a given database and returns a result handle

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radley25 at spamcop net
13 years ago
Always use this over the sqlite_fetch_* functions if possible as it's much faster.
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