sqlite_unbuffered_query

SQLiteDatabase::unbufferedQuery

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

sqlite_unbuffered_query -- SQLiteDatabase::unbufferedQuery — Execute a query that does not prefetch and buffer all data

说明

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 ]] ) : resource

面向对象风格 (method):

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

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

相关文章
php eventbuffer move all data from a buffer provided to the current instance of eventbufferphp dbx 函数 fetches rows from a query result that had the dbx result unbuffered flag setphp dbx 函数 send a query and fetch all results if any php informix 函数 formats all rows of a query into a html tablephp imap 函数 returns all of the imap errors that have occurredphp mailparse 函数 incrementally parse data into bufferphp openal 函数 load a buffer with dataphp sqlite 函数 execute a query against a given database and returns an arrayphp sqlite 函数 returns the number of rows that were changed by the most recent sql statementphp sqlite 函数 escapes a string for use as a query parameterphp sqlite 函数 finds whether or not more rows are availablephp sqlite 函数 returns whether or not a previous row is availablephp sqlite 函数 opens an sqlite database and create the database if it does not existphp sqlite 函数 opens a persistent handle to an sqlite database and create the database if it does not existphp sqlite 函数 executes a query and returns either an array for one single column or the value of the first rowphp sqlite 函数 decode binary data passed as parameters to an udfphp sqlite 函数 encode binary data before returning it from an udfphp sqlite 函数 execute a query that does not prefetch and buffer all dataphp stream 函数 receives data from a socket connected or notphp swoole buffer write data to the memory buffer. the memory allocated for the buffer will not be changed.
关注编程学问公众号