SQLite3Result::columnType

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

SQLite3Result::columnType — Returns the type of the nth column

说明

public SQLite3Result::columnType(int $column): int|false

Returns the type of the column identified by column.

参数

column: The numeric zero-based index of the column.

返回值

Returns the data type index of the column identified by column (one of SQLITE3_INTEGER, SQLITE3_FLOAT, SQLITE3_TEXT, SQLITE3_BLOB, or SQLITE3_NULL), or false if the column does not exist.

add a note

User Contributed Notes 3 notes

down

jean-marc at paratte dot ch ¶

7 years ago


To find the type of columns, you need to 'query' the SQL sentence, 'fetchArray' the 1rst row, and then extract the name and type of each column.

Example:

function _sqlite_fetch_all( $db, $sql ) {

    $sqlite = new SQLite3( $db);

    if( $sqlite->lastErrorCode() ) return;

    $result = $sqlite->query( $sql );

    $result->fetchArray( SQLITE3_NUM );
    $fieldnames = [];
    $fieldtypes = [];
    for( $colnum=0; $colnum<$result->numColumns(); $colnum++) {
        $fieldnames[] = $result->columnName($colnum);
        $fieldtypes[] = $result->columnType($colnum);
    }
    $result->reset();

    while( $row = $result->fetchArray( SQLITE3_NUM ) ) {

        for ($colnum=0; $colnum<count($row); $colnum++) {
            $col = &$row[$colnum];
            if (isset($fieldtype_encode_binary[$fieldtypes[$colnum]])) $col = $fieldtype_encode_binary[$fieldtypes[$colnum]]( $col );
        }
        unset($col);
        if ($resulttype == SQLITE3_ASSOC) $row = array_combine( $fieldnames, $row );
        $rows[] = $row;
    }

    $result->finalize();

    $sqlite->close();

    return $rows;
}

Remark 1: The type of a column is SQLITE3_NULL before any 'fetchArray' and 'false' after last fetched row.

Remark2 : The actual values of SQLITE3_INTEGER, SQLITE3_FLOAT, SQLITE3_TEXT, SQLITE3_BLOB, SQLITE3_NULL are 1, 2, 3, 4, 5.

down

phpnotes at carwash dot org ¶

10 years ago


This function never returns any value other than 5, indicating SQLITE3_NULL.  SQLite 3 doesn't have column types, it has column affinities.  Different rows of the same table (and rows resulting from a SELECT) can hold values of different types.  Therefore this API cannot return anything useful, and the method appears to be using SQLITE3_NULL as a placeholder. 

The function in useless and should be removed or marked as deprecated in future releases, so as not to give any programmer the false idea that the values returned are useful.

down

hairbysubaru at gmail dot com ¶

5 years ago


jean-marc is correct. SQLite determines column types dynamically based upon the returned record-set.

add a note

官方地址：https://www.php.net/manual/en/sqlite3result.columntype.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络数据库 JAVA 面试 NoSQL C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 PHP 8.1 ADORecordSet对象 adodb手册 opcache预加载 Composer的Packagist资源 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet PHP json解析（json_decode）页面工具 mysql面试题 [原创]诡异的php-fpm超时问题 php中几种注释规范支持php7的性能采集扩展纯php实现DES以及TripleDES加密算法 php 修改图片大小 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式

略微加速

PHP官方手册 - 互联网笔记

SQLite3Result::columnType

说明

参数

返回值

User Contributed Notes 3 notes