node.js脚本与同步sqlite3调用

Question

我试图在node.js脚本中使用sqlite3，我正在使用这个库：

https://github.com/mapbox/node-sqlite3

但我希望数据库中的调用是同步的而不是异步的，这是我使用的代码示例：

var tests = [];

db.serialize(function() {

  db.each("SELECT lot_id, status FROM TestTable ORDER BY lot_id ASC", function(err, row) {
      tests.push(row.status);
      console.log("Read "+row.lot_id+" state: "+row.status);
  });
});

db.close();

for (i = 0; i < tests.length; i++) {
//Do something
}

当执行到达for循环时，由于tests数组仍然为空而继续执行，我如何按顺序执行此指令？

感谢

Answer 1

在完整回调中执行for循环

var tests = [];

db.serialize(function() {

  db.each("SELECT lot_id, status FROM TestTable ORDER BY lot_id ASC", function(err, row) {
      tests.push(row.status);
      console.log("Read "+row.lot_id+" state: "+row.status);
  }, function() { // this callback is executed when the query completed
     for (i = 0; i < tests.length; i++) {
     // Do something
     }
  });
});

db.close();