This topic describes how to use the data integration feature of DataWorks to extract JSON fields from MongoDB to MaxCompute.

Preparations

  1. Prepare an account.

    Create a user in the database in advance to add data sources in DataWorks. In this example, you can run the db.createUser({user:"bookuser",pwd:"123456",roles:["root"]}) command to create a user named bookuser. The password of the user is 123456, and the permission is root.

  2. Prepare data.
    Upload data to your MongoDB. In this example, Alibaba Cloud ApsaraDB for MongoDB is used. The network type is VPC. (An Internet IP address is required for MongoDB to communicate with the default resource group of DataWorks.) The test data is as follows: 
    {
    "store": {
        "book": [
             {
                "category": "reference",
                "author": "Nigel Rees",
                "title": "Sayings of the Century",
                "price": 8.95
             },
             {
                "category": "fiction",
                "author": "Evelyn Waugh",
                "title": "Sword of Honour",
                "price": 12.99
             },
             {
                 "category": "fiction",
                 "author": "J. R. R. Tolkien",
                 "title": "The Lord of the Rings",
                 "isbn": "0-395-19395-8",
                 "price": 22.99
             }
          ],
          "bicycle": {
              "color": "red",
              "price": 19.95
          }
    },
    "expensive": 10
}
    Log on to the DMS console of MongoDB. In this example, the database name is admin and the collection is userlog. You can run the db.userlog.find().limit(10) command in the query window to view the uploaded data.

Use DataWorks to extract data to MaxCompute

  • 1. Add a MongoDB data source.
    In the DataWorks console, go to the Data Integration page and add a MongoDB data source.
    The parameters are shown in the following figure. Click Complete after the connectivity test is successful. In this example, the network type of MongoDB is VPC. Therefore, the Data Source Type must be set to Public IP Address Available.To obtain the IP address and the port number, log on to the and click the target instance. Example parameters are shown in the following figure.
  • 2. Create a data synchronization task.
    In the DataWorks console, create a data synchronization node. At the same time, create a table named mqdata in DataWorks to store JSON data.You can set the table parameters on the graphical interface. The mqdata table has only one column, which is named MQ data. The data type is string.
  • 3. Set the parameters.
    After creating a table, you can set the data synchronization task parameters on the graphical interface. First, set the destination data source to odps_first and the destination table to mqdata. Then, set the original data source to MongoDB and select mongodb_userlog. After completing the preceding settings, click Switch to script mode. The following is an example of the code in script mode: 
    
{
    "type": "job",
    "steps": [
        {
            "stepType": "mongodb",
            "parameter": {
                "datasource": "mongodb_userlog",
 //Data source name
                "column": [
                    {
                        "name": "store.bicycle.color", //JSON field path. In this example, the value of color is extracted.
                        "type": "document.document.string" //The number of fields in this line must be the same as that in the preceding line (the name line). If the JSON field is a level-1 field, for example, the expensive field in this topic, enter the string.
                    }
                ],
                "collectionName //Collection name": "userlog"
            },
            "name": "Reader",
            "category": "reader"
        },
        {
            "stepType": "odps",
            "parameter": {
                "partition": "",
                "isCompress": false,
                "truncate": true,
                "datasource": "odps_first",
                "column": [
                          "mqdata" //Table column name in MaxCompute
                ],
                "emptyAsNull": false,
                "table": "mqdata"
            },
            "name": "Writer",
            "category": "writer"
        }
    ],
    "version": "2.0",
    "order": {
        "hops": [
            {
                "from": "Reader",
                "to": "Writer"
            }
        ]
    },
    "setting": {
        "errorLimit": {
            "record": ""
        },
        "speed": {
            "concurrent": 2,
            "throttle": false,
            "dmu": 1
        }
    }
}
    After completing the preceding settings, click Run. If the following information is displayed, the code has run successfully.

Verify the result

Create an ODPS SQL node in your Overview.Enter the SELECT * from mqdata; statement to view the data in the mqdata table. You can also run the SELECT * from mqdata; command on the MaxCompute client to view the data.