OceanBase

JDBC OceanBase Source Connector

Key Features​

• batch

• stream

• exactly-once

• column projection

• parallelism

• support user-defined split

Description​

Read external data source data through JDBC.

Data Type Mapping​

Mysql Mode​

Mysql Data type	Nexus Data type
BIT(1) TINYINT(1)	BOOLEAN
TINYINT	BYTE
TINYINT TINYINT UNSIGNED	SMALLINT
SMALLINT UNSIGNED MEDIUMINT MEDIUMINT UNSIGNED INT INTEGER YEAR	INT
INT UNSIGNED INTEGER UNSIGNED BIGINT	BIGINT
BIGINT UNSIGNED	DECIMAL(20,0)
DECIMAL(x,y)(Get the designated column's specified column size.<38)	DECIMAL(x,y)
DECIMAL(x,y)(Get the designated column's specified column size.>38)	DECIMAL(38,18)
DECIMAL UNSIGNED	DECIMAL((Get the designated column's specified column size)+1, (Gets the designated column's number of digits to right of the decimal point.)))
FLOAT FLOAT UNSIGNED	FLOAT
DOUBLE DOUBLE UNSIGNED	DOUBLE
CHAR VARCHAR TINYTEXT MEDIUMTEXT TEXT LONGTEXT JSON ENUM	STRING
DATE	DATE
TIME	TIME
DATETIME TIMESTAMP	TIMESTAMP
TINYBLOB MEDIUMBLOB BLOB LONGBLOB BINARY VARBINAR BIT(n) GEOMETRY	BYTES

Oracle Mode​

Oracle Data type	Nexus Data type
Integer	DECIMAL(38,0)
Number(p), p <= 9	INT
Number(p), p <= 18	BIGINT
Number(p), p > 18	DECIMAL(38,18)
Number(p,s)	DECIMAL(p,s)
Float	DECIMAL(38,18)
REAL BINARY_FLOAT	FLOAT
BINARY_DOUBLE	DOUBLE
CHAR NCHAR VARCHAR VARCHAR2 NVARCHAR2 NCLOB CLOB LONG XML ROWID	STRING
DATE	TIMESTAMP
TIMESTAMP TIMESTAMP WITH LOCAL TIME ZONE	TIMESTAMP
BLOB RAW LONG RAW BFILE	BYTES
UNKNOWN	Not supported yet

Source Options​

Name	Type	Required	Default	Description
url	String	Yes	-	The URL of the JDBC connection. Refer to a case: jdbc:oceanbase://localhost:2883/test
driver	String	Yes	-	The jdbc class name used to connect to the remote data source, should be com.oceanbase.jdbc.Driver.
user	String	No	-	Connection instance user name
password	String	No	-	Connection instance password
compatible_mode	String	Yes	-	The compatible mode of OceanBase, can be 'mysql' or 'oracle'.
query	String	Yes	-	Query statement
connection_check_timeout_sec	Int	No	30	The time in seconds to wait for the database operation used to validate the connection to complete
partition_column	String	No	-	The column name for parallelism's partition, only support numeric type column and string type column.
partition_lower_bound	BigDecimal	No	-	The partition_column min value for scan, if not set Nexus will query database get min value.
partition_upper_bound	BigDecimal	No	-	The partition_column max value for scan, if not set Nexus will query database get max value.
partition_num	Int	No	job parallelism	The number of partition count, only support positive integer. Default value is job parallelism.
fetch_size	Int	No	0	For queries that return a large number of objects, you can configure the row fetch size used in the query to improve performance by reducing the number database hits required to satisfy the selection criteria. Zero means use jdbc default value.
properties	Map	No	-	Additional connection configuration parameters,when properties and URL have the same parameters, the priority is determined by the specific implementation of the driver. For example, in MySQL, properties take precedence over the URL.
common-options		No	-	Source plugin common parameters, please refer to Source Common Options for details

Tips​

If partition_column is not set, it will run in single concurrency, and if partition_column is set, it will be executed in parallel according to the concurrency of tasks.

Task Example​

Simple:​

env {
  parallelism = 2
  job.mode = "BATCH"
}

source {
  Jdbc {
    driver = "com.oceanbase.jdbc.Driver"
    url = "jdbc:oceanbase://localhost:2883/test?useUnicode=true&characterEncoding=UTF-8&rewriteBatchedStatements=true"
    user = "root"
    password = ""
    compatible_mode = "mysql"
    query = "select * from source"
  }
}

transform {
    # If you would like to get more information about how to configure Nexus and see full list of transform plugins,
    # please go to transform page
}

sink {
    Console {}
}

Parallel:​

Read your query table in parallel with the shard field you configured and the shard data. You can do this if you want to read the whole table

env {
  parallelism = 10
  job.mode = "BATCH"
}
source {
  Jdbc {
    driver = "com.oceanbase.jdbc.Driver"
    url = "jdbc:oceanbase://localhost:2883/test?useUnicode=true&characterEncoding=UTF-8&rewriteBatchedStatements=true"
    user = "root"
    password = ""
    compatible_mode = "mysql"
    query = "select * from source"
    # Parallel sharding reads fields
    partition_column = "id"
    # Number of fragments
    partition_num = 10
  }
}
sink {
  Console {}
}

Parallel Boundary:​

It is more efficient to read your data source according to the upper and lower boundaries you configured

source {
  Jdbc {
    driver = "com.oceanbase.jdbc.Driver"
    url = "jdbc:oceanbase://localhost:2883/test?useUnicode=true&characterEncoding=UTF-8&rewriteBatchedStatements=true"
    user = "root"
    password = ""
    compatible_mode = "mysql"
    query = "select * from source"
    partition_column = "id"
    partition_num = 10
    # Read start boundary
    partition_lower_bound = 1
    # Read end boundary
    partition_upper_bound = 500
  }
}