使用IndexedDB时，如何使用非键的索引删除多条记录？

Question

我在这里有创建 indexedDB 的代码：

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function create_db() {\n    var indexedDB = window.indexedDB || window.webkitIndexedDB || window.msIndexedDB;\n    var request = indexedDB.open(\xe2\x80\x9cphotos\xe2\x80\x9d, 2);\n\n    request.onupgradeneeded = function(event) {\n        var db = event.target.result;\n\n        // Create photo db\n        var photo_store = db.createObjectStore("photos", {keyPath: "photo_id"});\n        var photo_id_index = photo_store.createIndex("by_photo_id",        "photo_id", {unique: true});\n        var dest_id_index  = photo_store.createIndex("by_destination_id",  "destination_id");\n\n        console.log(\xe2\x80\x9cstore created\xe2\x80\x9d);\n    };\n\n    request.onsuccess = function(event) {\n        console.log(\xe2\x80\x9cstore opened\xe2\x80\x9d);\n    };\n\n    request.onerror = function(event) {\n        console.log("error: " + event);\n    };\n

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}

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我的删除条目的代码：

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 function remove_photos = function (destination_id, db) {\nvar transaction = db.transaction("photos", "readwrite");\nvar store       = transaction.objectStore("photos");\nvar index       = store.index("by_destination_id");\nvar request     = index.openCursor(IDBKeyRange.only(destination_id));\n\nrequest.onsuccess = function() {\n    var cursor = request.result;\n\n    if (cursor) {\n        cursor.delete();\n        cursor.continue();\n    }\n};\n

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}

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如何使用by_destination_id索引删除记录，以便删除具有给定destination_id（整数）的所有记录？

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谢谢你的帮助。

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Answer 1

我找到了问题的解决方案，IDBKeyRange.only 函数不喜欢整数，它需要是字符串，因此将此行替换为：

var request = index.openCursor(IDBKeyRange.only(destination_id.toString()));

让代码发挥作用。