小编Gov*_*tri的帖子

我的JSON是:

[
   {
      "distance":32,
      "stationCode":"MIG",
      "name":"Midghat",
      "platforms":"2"
   },
   {
      "distance":32,
      "stationCode":"MIG",
      "name":"Midghat",
      "platforms":"2"
   },
   {
      "distance":69,
      "stationCode":"MDDP",
      "name":"Mandideep",
      "platforms":"2"
   },
   {
      "distance":69,
      "stationCode":"MDDP",
      "name":"Mandideep",
      "platforms":"2"
   },
   {
      "distance":18,
      "stationCode":"HBD",
      "name":"Hoshangabad",
      "platforms":"2"
   },
   {
      "distance":18,
      "stationCode":"HBD",
      "name":"Hoshangabad",
      "platforms":"2"
   },
   {
      "distance":37,
      "stationCode":"CHQ",
      "name":"Choka",
      "platforms":"2"
   },
   {
      "distance":37,
      "stationCode":"CHQ",
      "name":"Choka",
      "platforms":"2"
   },
   {
      "distance":85,
      "stationCode":"HBJ",
      "name":"Habibganj",
      "platforms":"5"
   },
   {
      "distance":85,
      "stationCode":"HBJ",
      "name":"Habibganj",
      "platforms":"5"
   },
   {
      "distance":0,
      "stationCode":"ET",
      "name":"ItarsiJn",
      "platforms":"28"
   },
   {
      "distance":8,
      "stationCode":"PRKD",
      "name":"Powerkheda",
      "platforms":"2"
   },
   {
      "distance":8,
      "stationCode":"PRKD",
      "name":"Powerkheda",
      "platforms":"2"
   }, …

我的代码如下用于缩放时间 X 轴。我想在时间之间设置一个限制应该放大或缩小，即时间的上限和下限。我试图将边界值放在缩放函数中，这是在此d3 图中建议的缩放线程有限的函数。但它不起作用。

var x = d3.time
  .scale()
  .domain([start_date, end_date])
  .range([0, width]);

var zoom = d3.behavior
  .zoom()
  .x(x)
  .on("zoom", zoomed);

svg = d3
  .select("#chart" + k)
  .append("svg:svg")
  .attr("width", width + margin.left + margin.right)
  .attr("height", height + margin.top + margin.bottom)
  .append("svg:g")
  .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
  .call(zoom);

function zoomed() {
  svg.selectAll(".line").remove();

  makeBackground();

  svg.select(".x.axis").call(xAxis);
  d3.select(".x.axis.top").call(xAxisTop);

  svg.select(".x.grid").call(
    make_x_axis()
      .tickSize(-height, 0, 0)
      .tickFormat("")
  );
  svg.selectAll(".circle-path").remove();
  d3.selectAll(".trainTag").remove();
  drawPaths();
  drawCircle(x, y, chartBody, trainData[0]);
} …

我正在使用Embedded JavaAPI来实现我的实时应用程序.当一个事务被锁定数据库时,我的另一个ajax调用抛出数据库实例已被其他进程锁定的错误.大部分时间我的电话都是只读的.所以我的问题是:Neo4J JavaAPI中是否存在任何方法,以便我可以将事务锁定为只读,以便其他请求可以从DB获取数据.

dbFactory = new GraphDatabaseFactory();
db= dbFactory.newEmbeddedDatabase(DB_PATH);
tx = db.beginTx();

所以在这个db.beginTx()我可以告诉Neo4j它是一个只读模式或类似的东西.

谢谢,