Question

代码：

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp1.1</TargetFramework>
    <PreserveCompilationContext>true</PreserveCompilationContext>
    <AssemblyName>TestProj</AssemblyName>
    <OutputType>Exe</OutputType>
    <PackageId>TestProj</PackageId>
    <UserSecretsId>aspnet-TestProj-6af8ade3-87ff-4468-a9ce-8bb69c696ab8</UserSecretsId>
    <RuntimeFrameworkVersion>1.1.1</RuntimeFrameworkVersion>
    <PackageTargetFallback>$(PackageTargetFallback);dotnet5.6;portable-net45+win8</PackageTargetFallback>
  </PropertyGroup>

  <ItemGroup>
    <None Remove="Properties\PublishProfiles\TestProjP.pubxml" />
    <None Remove="Properties\PublishProfiles\FolderProfile.pubxml" />
    <None Remove="Properties\PublishProfiles\FolderProfile1.pubxml" />
  </ItemGroup>

  <ItemGroup>
    <None Update="wwwroot\**\*;Views\**\*;Areas\**\Views">
      <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
    </None>
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="bootstrap" Version="2.3.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="1.0.0" />
    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer.Design" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Authentication.Cookies" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Diagnostics" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Identity" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration.Tools" Version="1.1.0-preview4-final" />
    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="1.1.1" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="1.1.0">
      <PrivateAssets>All</PrivateAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.AspNetCore.Session" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="1.1.1" />
    <PackageReference Include="Microsoft.VisualStudio.Web.BrowserLink" Version="1.1.0" />
    <PackageReference Include="BundlerMinifier.Core" Version="2.3.327" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.2" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="1.1.2" />
    <PackageReference Include="EPPlus.Core" Version="1.4.0" />
  </ItemGroup>

 <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="1.0.0" />
  </ItemGroup>

</Project>

示例：http://localhost/Contable/autocompletecod.php?term=3269

输出如下

 <?php
$datoBuscar = $_GET["term"];

$conexion = mysql_connect("localhost", "root", "");
mysql_select_db("ap_contable");

$ssql = "SELECT provincia_id, nombre, codigopostal FROM ciudades WHERE codigopostal LIKE '%" . $datoBuscar . "%' LIMIT 50";
$rs = mysql_query($ssql, $conexion);

$arrayElementos = array();

while ($fila = mysql_fetch_array($rs)){

     echo $fila[provincia_id];

     $queryp = "SELECT nombre FROM provincias WHERE id = '$fila[provincia_id]' LIMIT 1";
     $resultp = mysql_query($queryp, $conexion);
     $foundp = mysql_fetch_array($resultp);

     echo $foundp['nombre'];

     $row['prov'] = $foundp['nombre'];
     $row_set[] = $row;

}
echo json_encode($row_set);
?>

我故意让ECHO看看是否从MySQL数据库中获取数据以及是否获得了数据。问题是，当我将它分配给数组时，$ row ['prov'] = $ foundp ['nombre'];问题出在哪儿？它说NULL应该说Entre Rios

Answer 1

您的字符串需要采用UTF-8编码（这是json_encode()要求）。试试这个：

$row['prov'] = utf8_encode($foundp['nombre']);

或者，您可以在MySQL连接中将CHARACTER SET设置为utf8mb4。理想情况下，您应该使用UTF-8。阅读this。

Answer 2

呃，你的代码出于很多原因是错误的：

mysql_ *已弃用 http://php.net/manual/en/function.mysql-connect.php使用PDO
传递给SQL的不受保护的$ datoBuscar变量 https://en.wikipedia.org/wiki/SQL_injection
未使用$ arrayElementos
您应该加入以下两个表：SELECT p.nombre FROM provincias AS p JOIN ciudades AS c ON p.id = c.provincia_id WHERE c.codigopostal LIKE '%" . $datoBuscar . "%' https://dev.mysql.com/doc/refman/5.7/en/join.html
$ row_set未定义
$ row未定义
结束？＆gt;不应该用于纯PHP文件Why would one omit the close tag?

所以，它应该看起来像这样（未经测试的代码）：

$datoBuscar = $_GET["term"];
$db = new PDO('mysql:host=localhost;dbname=ap_contable', 'root', 'PASSWORD', [PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8'"]);
$query = $db->prepare('SELECT p.nombre FROM provincias AS p JOIN ciudades AS c ON p.id = c.provincia_id WHERE c.codigopostal LIKE \'%?%\'');
$query->execute([$datoBuscar]);
$results = $query->fetchAll();
$json = [];
foreach($results AS $result)
{
   $row = [];
   $row['prov'] = $result['nombre'];
   $json[] = $row;
}
echo json_encode($json);

PS：如果你想编写好的PHP代码，启用通知和警告错误报告，你会惊讶于你错过了什么和“这段代码如何在第一位工作？！”

Answer 3

要将$ row数组分配到$ row_set数组，请使用此

$row_set = $row;

这样你就可以在$ row_set中获得$ row数组的所有内容。每当你运行一个loog并且你在同一个索引处设置$ row_set的值时，你将只获得数组中的最后一个循环执行值。如果您想要所有结果，那么您可以使用array_push(); 来自php manual int array_push ( array &$array , mixed $value1 [, mixed $... ] )的描述。在您的情况下，您可以使用

array_push($row_set, $row);

而不是

$row_set[] = $row;

json_encode传递空值

3 个答案: