DataDirect JDBC Driver for VMware Tanzu Greenplum

DataDirect JDBC drivers are compliant with the Type 4 architecture, but provide advanced features that define them as Type 5 drivers. Additionally, the drivers consistently support the latest database features and are fully compliant with Java™ SE 8 and JDBC 4.0 functionality.

The DataDirect JDBC Driver for VMware Tanzu Greenplum is available for download from VMware Tanzu Network.

Prerequisites

The DataDirect JDBC Driver requires Java SE 5 or higher. See System and Product Requirements in the DataDirect documentation for information and requirements associated with specific features of the JDBC driver.
The license key is embedded in the greenplum.jar file itself. You do not need to apply a specific license key to the driver to activate it.

Downloading the DataDirect JDBC Driver

To install the JDBC driver on your client:

Log into VMware Tanzu Network and download the DataDirect JDBC driver file: PROGRESS_DATADIRECT_JDBC_DRIVER_PIVOTAL_GREENPLUM_5.1.4.zip.
Extract the downloaded ZIP file.
Add the full path to the PROGRESS_DATADIRECT_JDBC_DRIVER_PIVOTAL_GREENPLUM_5.1.4.jar to your Java CLASSPATH environment variable, or add it to your classpath with the -classpath option when executing a Java application.

Obtaining Version Details for the Driver

To view the JDBC driver version information:

Change to the directory that contains the downloaded PROGRESS_DATADIRECT_JDBC_DRIVER_PIVOTAL_GREENPLUM_5.1.4.jar driver file. For example:
```
$ cd /opt/Progress/DataDirect/Connect_for_JDBC_51/lib
```

Execute the data source class to display the version information.

For Linux/Unix systems:

$ java -classpath PROGRESS_DATADIRECT_JDBC_DRIVER_PIVOTAL_GREENPLUM_5.1.4.jar com.pivotal.jdbc.GreenplumDriver
[Pivotal][Greenplum JDBC Driver]Driver Version: 5.1.4.000223 (F000432.U000208)

For Windows systems:

java -classpath .;.\greenplum.jar com.pivotal.jdbc.GreenplumDriver
[Pivotal][Greenplum JDBC Driver]Driver Version: 5.1.4.000223 (F000432.U000208)

Usage Information

The JDBC driver is provided in the greenplum.jar file. Use the following data source class and connection URL information with the driver.

Property	Description
Driver File Name	greenplum.jar
Data Source Class	com.pivotal.jdbc.GreenplumDriver
Connection URL	jdbc:pivotal:greenplum://host:port;DatabaseName=<name>
Driver Defaults	FetchTWFSasTime=true MaxLongVarcharSize=8190 MaxNumericPrecision=28 MaxNumericScale=6 PrepareThreshold=0 ResultSetMetadataOptions=1 SupportsCatalogs=true

Configuring Prepared Statement Execution

The DataDirect JDBC driver version 5.1.4.000270 (F000450.U000214) introduced support for the PrepareThreshold connection property. This property specifies the number of prepared statement executions to be performed before the driver switches to using server-side prepared statements.

The PrepareThreshold default value is 0, always use server-side prepare for prepared statements. This setting preserves the behavior of previous versions of the JDBC driver.

When the PrepareThreshold value is greater than 1, it specifies on which execution of a prepared statement the driver starts using server-side prepared statements.

Note: statement.executeBatch() always uses server-side prepare for prepared statements. This matches the behavior of the PostgreSQL open source JDBC driver.

Refer to PrepareThreshold in the DataDirect documentation for additional information about this connection property.

Limitation

When the PrepareThreshold value is greater than one and the prepared statement includes parameterized operations, the driver does not send any SQL prepare calls during connection.prepareStatement(). The driver instead sends the query all at once, at execution time. This requires that the driver determine the data types of every column before it sends the query to the server. While the driver can make this determination for many data types, it cannot for the JDBC types that can be mapped to multiple Greenplum data types:

BIT VARYING
BOOLEAN
JSON
TIME WITH TIME ZONE
UUIDCOL

To work around this limitation, set PrepareThreshold to 0 when a prepared statement uses parameterized values with any of the above data types. And use ResultSet.getMetaData() to determine if any of the above types are used in a query in advance of submitting the prepared statement.

Note: GPORCA does not support prepared statements that have parameterized values, and will fall back to using the Postgres Planner.

DataDirect Driver Documentation

For more information on working with the Data Direct JDBC driver, see documentation available online at https://www.progress.com/documentation/datadirect-connectors. Titles include: