When calling functions on a closed database, confusing "out of memory" error is reported

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难度
2/5
预计耗时
1-3 小时
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
javascript, sqlite
领域
database

调研方向

Start at Database.prototype.handleError in the issue's JavaScript snippet and reproduce calling each on a closed database. Check how the null database reaches sqlite3_errmsg; done means the closed-database case reports an intuitive error instead of "out of memory."

由索引模型根据 Issue 内容生成。

描述

bug

I realize that calling methods on a database that's been closed is not a good idea. However, when calling a method like each on the closed database, the error reported is out of memory. The underlying db is nulled out on close (which makes sense). But then, in the handleError method:

Database.prototype.handleError = function(returnCode) {
    var errmsg;
    if (returnCode === SQLite.OK) {
      return null;
    } else {
      errmsg = sqlite3_errmsg(this.db);
      throw new Error(errmsg);
    }
  };

We're passing null into the sqlite3_errmsg. That in turn causes it to report it as a memory allocation error.

Ideally, the error reported would be something more intuitive. I bring this up because I am now closing databases that we are no longer using in an effort to fix a real memory allocation error. However, in the process of doing so, I accidentally closed a database I shouldn't have and continued to get what looked like memory errors. It wasn't until later that I realized this message was inaccurate.

主要语言
JavaScript
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