JDBC Packages, Driver Classes, and Environment Classes

JDBC Packages

Obtain the package GaussDB-Kernel_Database version number_OS version number_64bit_Jdbc.tar.gz from the release package. After the decompression, you will obtain the following JDBC packages in .jar format:

• gaussdbjdbc.jar: The main class name is com.huawei.gaussdb.jdbc.Driver. The URL prefix of the database connection is jdbc:gaussdb. This driver package is recommended. The Java code examples in this section use the gaussdbjdbc.jar package by default.
• gscejdbc.jar: The main class name is com.huawei.gaussdb.jdbc.Driver. The URL prefix of the database connection is jdbc:gaussdb. This driver package contains the dependent libraries related to encryption and decryption that need to be loaded to the encrypted database. You are advised to use this driver package in encrypted scenarios. Currently, only EulerOS is supported.
• gaussdbjdbc-JRE7.jar: The main class name is com.huawei.gaussdb.jdbc.Driver. The URL prefix of the database connection is jdbc:gaussdb. The gaussdbjdbc-JRE7.jar package is used in the JDK 1.7 environment.

• Before using the gscejdbc.jar driver package, you need to set the environment variable LD_LIBRARY_PATH. For details, see section "Setting Encrypted Equality Queries > Using JDBC to Operate an Encrypted Database" in Feature Guide.
• In JDK 1.8, you are advised to use gaussdbjdbc.jar instead of gaussdbjdbc-JRE7.jar.
• For details about other JAR packages, see JDBC Compatibility Package.

Driver Class

Before establishing a database connection, load the com.huawei.gaussdb.jdbc.Driver database driver class.

1. GaussDB is compatible with PostgreSQL in the use of JDBC. Therefore, when two JDBC drivers are used in the same process, class names may conflict.
2. GaussDB JDBC driver has the following enhanced features:
   1. The SHA256 encryption mode is supported for login.
   2. The third-party log framework that implements the sf4j API can be connected.
   3. DR failover is supported.

Environment Class

JDK1.8 must be configured on the client. JDK supports multiple platforms such as Windows and Linux. The following uses Windows as an example to describe how to configure JDK 1.8:

1. Enter java -version in the MS-DOS window (command prompt in Windows) to check the JDK version. Ensure that the JDK version is JDK1.8. If JDK is not installed, download the installation package from the official website and install it.
2. Configure system environment variables.
   1. Right-click My computer and choose Properties.
   2. In the System window, click Advanced system settings in the navigation pane.
   3. In the System Properties dialog box, click Environment Variables on the Advanced tab page.
   4. In the System variables area of the Environment Variables dialog box, click New or Edit to configure system variables. For details about the variables, see Table 1.

      Table 1 Variables

      Variable	Operation	Variable Value
      JAVA_HOME	If the variable exists, click Edit. If the variable does not exist, click New.	Specifies the Java installation directory. Example: C:\Program Files\Java\jdk1.8.0_131
      Path	Click Edit.	If JAVA_HOME is configured, add %JAVA_HOME%\bin before the variable value. If JAVA_HOME is not configured, add the following full Java installation path before the variable value: C:\Program Files\Java\jdk1.8.0_131\bin
      CLASSPATH	Click New.	%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar