Reads from a MySQL instance using a configurable SQL query. Outputs one record for each row returned by the query.
The source is used whenever you need to read from a MySQL instance. For example, you may want to create daily snapshots of a database table by using this source and writing to a TimePartitionedFileSet.
Reference Name: Name used to uniquely identify this source for lineage, annotating metadata, etc. Typically, the name of the table/view.
Use Connection Whether to use a connection. If a connection is used, you do not need to provide the credentials.
Connection Name of the connection to use. Project and service account information will be provided by the connection. You also can use the macro function ${conn(connection-name)}.
Driver Name: Name of the JDBC driver to use.
Host: Host that MySQL is running on.
Port: Port that MySQL is running on.
Database: MySQL database name.
Import Query: The SELECT query to use to import data from the specified table. You can specify an arbitrary number of columns to import, or import all columns using *. The Query should contain the '$CONDITIONS' string. For example, 'SELECT * FROM table WHERE $CONDITIONS'. The '$CONDITIONS' string will be replaced by 'splitBy' field limits specified by the bounding query. The '$CONDITIONS' string is not required if numSplits is set to one.
Bounding Query: Bounding Query should return the min and max of the values of the 'splitBy' field. For example, 'SELECT MIN(id),MAX(id) FROM table'. Not required if numSplits is set to one.
Split-By Field Name: Field Name which will be used to generate splits. Not required if numSplits is set to one.
Number of Splits to Generate: Number of splits to generate.
Username: User identity for connecting to the specified database.
Password: Password to use to connect to the specified database.
Transaction Isolation Level The transaction isolation level of the database connection
- TRANSACTION_READ_COMMITTED: No dirty reads. Non-repeatable reads and phantom reads are possible.
- TRANSACTION_SERIALIZABLE: No dirty reads. Non-repeatable and phantom reads are prevented.
- TRANSACTION_REPEATABLE_READ: No dirty reads. Prevents non-repeatable reads, but phantom reads are still possible.
- TRANSACTION_READ_UNCOMMITTED: Allows dirty reads (reading uncommitted changes from other transactions). Non-repeatable reads and phantom reads are possible.
For more details on the Transaction Isolation Levels supported in MySQL, refer to the MySQL documentation
Connection Arguments: A list of arbitrary string key/value pairs as connection arguments. These arguments will be passed to the JDBC driver as connection arguments for JDBC drivers that may need additional configurations.
Auto Reconnect: Should the driver try to re-establish stale and/or dead connections.
Schema: The schema of records output by the source. This will be used in place of whatever schema comes back from the query. However, it must match the schema that comes back from the query, except it can mark fields as nullable and can contain a subset of the fields.
Use SSL: Turns on SSL encryption. The connection will fail if SSL is not available.
Keystore URL: URL to the client certificate KeyStore (if not specified, use defaults). Must be accessible at the same location on host where CDAP Master is running and all hosts on which at least one HDFS, MapReduce, or YARN daemon role is running.
Keystore Password: Password for the client certificates KeyStore.
Truststore URL: URL to the trusted root certificate KeyStore (if not specified, use defaults). Must be accessible at the same location on host where CDAP Master is running and all hosts on which at least one HDFS, MapReduce, or YARN daemon role is running.
Truststore Password: Password for the trusted root certificates KeyStore
Use Compression: Use zlib compression when communicating with the server. Select this option for WAN connections.
Use ANSI Quotes: Treats " as an identifier quote character and not as a string quote character.
SQL_MODE: Override the default SQL_MODE session variable used by the server.
Fetch Size: The number of rows to fetch at a time per split. Larger fetch size can result in faster import, with the tradeoff of higher memory usage.
| MySQL Data Type | CDAP Schema Data Type | Comment |
| ------------------------------ | --------------------- | -------------------------------------------------- |
| BIT | boolean | |
| TINYINT | int | |
| BOOL, BOOLEAN | boolean | |
| SMALLINT | int | |
| MEDIUMINT | double | |
| INT,INTEGER | int | |
| BIGINT | long | |
| FLOAT | float | |
| DOUBLE | double | |
| DECIMAL | decimal | |
| DATE | date | |
| DATETIME | timestamp | |
| TIMESTAMP | timestamp | |
| TIME | time | |
| YEAR | date | |
| CHAR | string | |
| VARCHAR | string | |
| BINARY | bytes | |
| VARBINARY | bytes | |
| TINYBLOB | bytes | |
| TINYTEXT | string | |
| BLOB | bytes | |
| TEXT | string | |
| MEDIUMBLOB | bytes | |
| MEDIUMTEXT | string | |
| LONGBLOB | bytes | |
| LONGTEXT | string | |
| ENUM | string | |
| SET | string | |
Suppose you want to read data from MySQL database named "prod" that is running on "localhost" port 3306, as "root" user with "root" password (Ensure that the driver for MySQL is installed. You can also provide driver name for some specific driver, otherwise "mysql" will be used), then configure plugin with:
Reference Name: "src1"
Driver Name: "mariadb"
Host: "localhost"
Port: 3306
Database: "prod"
Import Query: "select id, name, email, phone from users;"
Number of Splits to Generate: 1
Username: "root"
Password: "root"
For example, if the 'id' column is a primary key of type int and the other columns are non-nullable varchars, output records will have this schema:
| field name | type |
| -------------- | ------------------- |
| id | int |
| name | string |
| email | string |
| phone | string |