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    JSON Demo Description

    Last updated: 2024-07-08 16:52:02
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      The demo for each programming language uses JSON for serialization and contains a Record definition file. In the demo for Java, the path of the definition file is consumerDemo-json-java\\src\\main\\java\\json\\FlatRecord.java.

      ‍Type of Field in Record

      Field Name in Record
      Description
      id
      The globally incremental ID
      version
      The protocol version, which is v1 currently.
      messageType
      The message type. Enumerated values: "INSERT", "UPDATE", "DELETE", "DDL", "BEGIN", "COMMIT", "HEARTBEAT", "CHECKPOINT".
      fileName
      The name of the binlog file where the current record is located
      position
      The end offset of the current record in the binlog in the format of End_log_pos@binlog file number. For example, if the current record is in file mysql-bin.000004 and the end offset is 2196, then the value of this parameter will be 2196@4.
      safePosition
      The start offset of the current transaction in the binlog, which is in the same format as described above.
      timestamp
      The time when the data was written to the binlog, which is a UNIX timestamp in seconds.
      gtid
      The current GTID, such as c7c98333-6006-11ed-bfc9-b8cef6e1a231:9.
      transactionId
      The transaction ID, which is generated only for COMMIT events.
      serverId
      The server ID of the source database, which can be viewed by running SHOW VARIABLES LIKE 'server_id'.
      threadId
      The ID of the session that committed the current transaction, which can be viewed by running SHOW processlist;.
      sourceType
      The source database type, which currently can only be MySQL.
      sourceVersion
      The source database version, which can be viewed by running: select version();.
      schemaName
      Database name
      tableName
      Table name
      objectName
      Format: Database name.table name
      columns
      The definitions of columns in the table
      oldColumns
      The data of the row before DML execution. If the message is an INSERT message, the array will be null.
      newColumns
      The data of the row after DML execution. If the message is a DELETE message, the array will be null.
      sql
      The DDL SQL statement
      executionTime
      The DDL execution duration in seconds
      heartbeatTimestamp
      The timestamp of the heartbeat message in seconds. This field is present only for heartbeat messages.
      syncedGtid
      The collection of GTIDs parsed by DTS in the format of c7c98333-6006-11ed-bfc9-b8cef6e1a231:1-13
      fakeGtid
      Whether the current GTID is forged. If gtid_mode is not enabled, DTS will forge a GTID.
      pkNames
      If the table in the source database has a primary key, this parameter will be carried in the DML message; otherwise, it will not be carried.
      readerTimestamp
      The time when DTS processed the current data record, which is a UNIX timestamp in milliseconds.
      tags
      The status_vars in QueryEvent. For more information, see QueryEvent.
      total
      The total number of message segments if the message is segmented. This field is invalid on the current version (version=1) and is reserved for extension.
      index
      The index of message segments if the message is segmented. This field is invalid on the current version (version=1) and is reserved for extension.

      MySQL Column Attribute in Record

      name: The column name.
      dataTypeNumber: The type of the data recorded in the binlog. For values, see MySQL source code documentation.
      isKey: Whether the current key is the primary key.
      originalType: The type defined in DDL.

      MySQL Data Type Conversion Logic

      In the JSON protocol, all MySQL data types are converted to strings.
      String types such as varchar are all converted to UTF-8 encoding.
      Numeric types are all converted to strings equal to the value, such as "3.0".
      Time types are output in the format of yyyy-dd-mm hh:MM:ss.milli.
      Timestamp types are output as the number of milliseconds.
      Binary types such as binary and blob are output as strings equal to their hex values, such as "0xfff".
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