javascript - 取消阻止IndexedDB

尝试使用IndexedDB。我编写了一个函数，该函数创建新的表和索引并返回回调。

但是当我尝试使用该功能时，它停止工作-在onsuccess状态之后，我得到了onblocked状态，而onupgradeneeded无法运行...

如何避免阻塞数据库？

crtTable(db_name, table, indexes, callback) {
    console.log("Initiate table creation");
    let isSupport:boolean = this.checkDbSupport();
    if(!isSupport) return;

    let version;
    let openRequest = indexedDB.open(db_name);
    openRequest.onsuccess = (event) => {
        console.log("Opening DB and find version");
        version = (event.target as any).result.version;

        //I GOT DB VERSION AND NOW I TRYING TO CLOSE IT!
        (event.target as any).result.close();

        version++;

        console.log("reopen DB with new version")
        let openRequest = indexedDB.open(db_name, version);

        openRequest.onblocked = (event) => {
            console.log("blocked");
        }

        openRequest.onupgradeneeded = (event) => {
            console.log("update running")
            let db = (event.target as any).result;

            let transaction = db.createObjectStore(table[0], { keyPath: table[1] });
            for(let index of indexes) {
                transaction.createIndex(index[0], index[0], { unique: index[1] });
            }
            transaction.oncomplete = (event) => {
                console.log("indexes setted");
            }
            callback("updated");
            console.log("updated");
        };

        openRequest.onsuccess = (event) => {
            openRequest.result.close();
            callback("success");
            console.log("success");
        };

        openRequest.onerror = (event) => {
            openRequest.result.close();
            callback("error");
            console.log("error");
        };
    };
}

最佳答案

在将数据库升级到新版本之前，必须关闭其他数据库连接。


  IDBOpenDBRequest.onblocked事件处理程序是阻止事件的事件处理程序。当由于版本更改而触发需要升级时触发该事件，但是即使在发送版本更改事件之后，数据库仍在某处使用（即未关闭）。


https://developer.mozilla.org/en-US/docs/Web/API/IDBOpenDBRequest/onblocked

更新：

您正在尝试在onsuccess和onerror事件上关闭它，并且由于数据库已经打开并且它调用onblocked事件而未调用它，因此也尝试在onblocked事件上关闭数据库。

openRequest.onblocked = (event) => {
      (event.target as any).result.close();
      console.log("blocked");
 }

关于javascript - 取消阻止IndexedDB，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/41549910/