首先，激活您提到的 enableLiveAutocompletion，并且您还必须确保定义了 enableBasicAutocompletion 并且设置为 true(见下文).

First, Activate the enableLiveAutocompletion as you mentioned, and you also have to ensure enableBasicAutocompletion is defined and set to true (see below).

editor.session.setMode("ace/mode/sql");
editor.setOptions({
    enableBasicAutocompletion: true,
    enableSnippets: true,
    enableLiveAutocompletion: true
});

要添加新的完成者，请执行 eemp 在 github 上提到的操作(这里).

To add a new completer, do what eemp mentioned on github (here).

let langTools = ace.require('ace/ext/language_tools');

然后使用 addCompleter 方法添加如下定义的补全:

Then use the addCompleter method to add the completions as defined below:

var customCompleter = {
  getCompletions: function(editor, session, pos, prefix, callback) {
       // your code
       /* for example
        * let TODO = ...;
        * callback(null, [{name: TODO, value: TODO, score: 1, meta: TODO}]);
        */
  }

 }
langTools.addCompleter(customCompleter);

你也可以去看看以下内容:

You can also go have a look at the following:

关于 Completers 的 Ace 文档一>.