Question

我正在尝试在drupal 8中对几个表进行完全外部联接...

mysql不支持完全外部联接，因此我使用左联接联合右联接

它获取了大多数数据，但是在我查询的材料中，我知道有多种材料，但是我只能得到一种...

我看不到我在做什么错

我直接访问数据库而不使用助手功能，因为这实际上是我正在编写的移动应用程序，用于从手机或平板电脑查询数据库

    $query_phrase = "select 
                     commerce_product_field_data.title as title,
                     commerce_product_field_data.product_id as product_id,
                     commerce_product__8fd244ef14.field_has_multiple_configuration_value as has_multiple_configuration,
                     commerce_product__field_barcode.field_barcode_value as barcode,
                     commerce_product__field_price.field_price_number as price,
                     commerce_product__field_price.field_price_currency_code as currency_code,
                     commerce_product__field_sku.field_sku_value as sku,
                     node_field_data.title as material_name,
                     file_managed.uri as uri,
                     file_managed.filename as filename

                     from {commerce_product_field_data}

                     left join commerce_product__8fd244ef14 on product_id = commerce_product__8fd244ef14.entity_id
                     left join commerce_product__field_barcode on product_id = commerce_product__field_barcode.entity_id
                     left join commerce_product__field_price on product_id = commerce_product__field_price.entity_id
                     left join commerce_product__field_sku on product_id = commerce_product__field_sku.entity_id
/*not working*/      left join commerce_product__field_materials  on product_id = commerce_product__field_materials.entity_id
/*not working*/      left join node_field_data on commerce_product__field_materials.field_materials_target_id = node_field_data.nid
                     left join file_managed on product_id = file_managed.fid";

       $query_phrase .= " union ";

    $query_phrase .= "select 
                     commerce_product_field_data.title as title,
                     commerce_product_field_data.product_id as product_id,
                     commerce_product__8fd244ef14.field_has_multiple_configuration_value as has_multiple_configuration,
                     commerce_product__field_barcode.field_barcode_value as barcode,
                     commerce_product__field_price.field_price_number as price,
                     commerce_product__field_price.field_price_currency_code as currency_code,
                     commerce_product__field_sku.field_sku_value as sku,
                     node_field_data.title as material_name,
                     file_managed.uri as uri,
                     file_managed.filename as filename

                     from {commerce_product_field_data}

                     right join commerce_product__8fd244ef14 on product_id = commerce_product__8fd244ef14.entity_id
                     right join commerce_product__field_barcode on product_id = commerce_product__field_barcode.entity_id
                     right join commerce_product__field_price on product_id = commerce_product__field_price.entity_id
                     right join commerce_product__field_sku on product_id = commerce_product__field_sku.entity_id
/*not working*/      right join commerce_product__field_materials  on product_id = commerce_product__field_materials.entity_id
/*not working*/      right join node_field_data on commerce_product__field_materials.field_materials_target_id = node_field_data.nid
                     right join file_managed on product_id = file_managed.fid";

       $query_phrase .=  " where commerce_product__field_barcode.field_barcode_value = :barcode";


    $query = db_query($query_phrase, array(":barcode" => "334242"));

当我调试结果时，我会得到

Array
(
    [title] => Dummy Product
    [product_id] => 2
    [has_multiple_configuration] => 0
    [barcode] => 334242
    [price] => 325.000000
    [currency_code] => USD
    [sku] => dummy sku
    [material_name] => test material
    [uri] => public:a

但是我知道我有不止一种材料

Answer 1

您在查询的Protein | Condition | Slope A | N | 0.2 A | C | -0.5 B | N | 0.3 B | C | -0.4部分中缺少where子句。

left join

我的左联接工会右联接不太有效，我试图模拟一个完整的外部联接

1 个答案: