grafana/public/app/plugins/datasource/mysql/query_ctrl.ts

///<reference path="../../../headers/common.d.ts" />

import _ from "lodash";
import { QueryCtrl } from "app/plugins/sdk";

export interface MysqlQuery {
  refId: string;
  format: string;
  alias: string;
  rawSql: string;
}

export interface QueryMeta {
  sql: string;
}

const defaultQuery = `SELECT
  UNIX_TIMESTAMP(<time_column>) as time_sec,
  <value column> as value,
  <series name column> as metric
FROM <table name>
WHERE $__timeFilter(time_column)
ORDER BY <time_column> ASC
`;

export class MysqlQueryCtrl extends QueryCtrl {
  static templateUrl = "partials/query.editor.html";

  showLastQuerySQL: boolean;
  formats: any[];
  target: MysqlQuery;
  lastQueryMeta: QueryMeta;
  lastQueryError: string;
  showHelp: boolean;

  /** @ngInject **/
  constructor($scope, $injector) {
    super($scope, $injector);

    this.target.format = this.target.format || "time_series";
    this.target.alias = "";
    this.formats = [
      { text: "Time series", value: "time_series" },
      { text: "Table", value: "table" }
    ];

    if (!this.target.rawSql) {
      // special handling when in table panel
      if (this.panelCtrl.panel.type === "table") {
        this.target.format = "table";
        this.target.rawSql = "SELECT 1";
      } else {
        this.target.rawSql = defaultQuery;
      }
    }

    this.panelCtrl.events.on(
      "data-received",
      this.onDataReceived.bind(this),
      $scope
    );
    this.panelCtrl.events.on("data-error", this.onDataError.bind(this), $scope);
  }

  onDataReceived(dataList) {
    this.lastQueryMeta = null;
    this.lastQueryError = null;

    let anySeriesFromQuery = _.find(dataList, { refId: this.target.refId });
    if (anySeriesFromQuery) {
      this.lastQueryMeta = anySeriesFromQuery.meta;
    }
  }

  onDataError(err) {
    if (err.data && err.data.results) {
      let queryRes = err.data.results[this.target.refId];
      if (queryRes) {
        this.lastQueryMeta = queryRes.meta;
        this.lastQueryError = queryRes.error;
      }
    }
  }
}