将多对多原始 sql 语句转换为 eloquent 查询构建器

Question

我需要翻译这个有效的 sql 语句：

select model_names.name
FROM blog_posts 
INNER JOIN model_names_relations
INNER JOIN model_names
ON blog_posts.id = model_names_relations.blog_post_id and model_names.id = model_names_relations.model_name_id
WHERE blog_posts.id = '12'

到 laravel 查询生成器。我没有使用完整的 orm，所以我不能使用 belongstomany 特性。我仅限于查询生成器。

我试过这个：

$query = ( new DbSql )->db()->table( 'blog_posts' )
        ->join( 'model_names_relations', 'blog_post_id.id', '=', 'model_names_relations.blog_post_id' )
        ->join( 'model_names', 'model_names.id', '=', 'model_names_relations.model_name_id' )
        ->where( 'blog_posts.id', '12')
        ->select( 'model_names.name' )
        ->get();

    var_dump( $query );
    exit;

但它不起作用我得到：

protected 'message' => string 'SQLSTATE[42S22]: Column not found: 1054 Unknown column 'blog_post_id.id' in 'on clause' (SQL: select model_names.name from blog_posts inner join model_names_relations on blog_post_id.id = model_names_relations.blog_post_id inner join model_names on model_names.id = model_names_relations.model_name_id where blog_posts.id = 12)' (length=357) private 'string' (Exception) => string '' (length=0)

正确的转换语法是什么？

Answer 1

这里是 Laravel 查询生成器

$query =DB::table('blog_posts')
->join('model_names_relations', 'blog_posts.id', '=', 'model_names_relations.blog_post_id')
->join('model_names', 'model_names.id', '=', 'model_names_relations.model_name_id')
->where('blog_posts.id', '12')
->get();

但是你的错误意味着 blog_post_id table 中没有 'id'。

将多对多原始 sql 语句转换为 eloquent 查询构建器

Convert a many to many raw sql statement to eloquent query builder

laravel

eloquent

laravel-eloquent