Testing JDBC Connections and Troubleshooting. Testing JDBC Connections and Troubleshooting. You can use JDBC to connect Oracle database from Java Program. Tips Simple Oracle Database JDBC Connect and ExecuteQuery Example. Simple Oracle Database JDBC Connect and ExecuteQuery Example in Java. Home > Core Java > JDBC > JDBC MySQL Database Connection Example. Java code for connecting MS SQL Server by using SQL Server Authentication First. Test MySQL JDBC Driver Installation : MySQL « Database SQL JDBC « Java. Creating a MySQL Database Table to store Java Types: 4. JDBC Mysql Connection String: 5. The following sections describe how to test, monitor, and troubleshoot JDBC connections: Monitoring JDBC Connectivity. The Administration Console provides tables and statistics to enable monitoring the connectivity parameters for each of the subcomponents—Connection Pools, Multi. Pools and Data. Sources. You can also access statistics for connection pools programmatically through the JDBCConnection. Pool. Runtime. MBean; see Web. Logic Server Partner's Guide and the Web. Logic Javadoc. This MBean is the same API that populates the statistics in the Administration Console. Read more about monitoring connectivity in JDBC Connection Pools . For information about using MBeans, see Programming Web.
Logic JMX Services. Validating a DBMS Connection from the Command Line Use BEA utilities to test two- tier and three- tier JDBC database connections after you install Web. Logic Server. Testing a Two- Tier Connection from the Command Line To use the utils. JDBC driver. Make sure you have completed the following: For Type 2 JDBC drivers, such as Web. Logic j. Driver for Oracle, set your PATH (Windows) or shared/load library path (UNIX) to include both your DBMS- supplied client installation and the BEA- supplied native libraries. For all drivers, include the classes of your JDBC driver in your CLASSPATH. Configuration instructions for the BEA Web. Testing a connection via JDBC. Run the connection test program. Run the connection test On Windows java -cp.;'C. Simple JDBC connection test with JUnit. JUnit test on DAO class using JDBC and Mockito Java. Program to count vowels. Logic j. Driver JDBC drivers are available at: Use the utils. Java and your database. The dbping utility is only for testing a two- tier connection, using a Web. Logic two- tier JDBC driver like Web. Logic j. Driver for Oracle. Syntax $ java utils. DBMS user password DBArguments. DBMSUse: ORACLE or MSSQLSERVER4user Valid username for database login. Use the same values and format that you use with isql for SQL Server or sqlplus for Oracle. Use the same values and format that you use with isql or sqlplus. DB Name of the database. The format varies depending on the database and version. Use the same values and format that you use with isql or sqlplus. Type 4 drivers, such as MSSQLServer. Examples. Oracle Connect to Oracle from Java with Web. Logic j. Driver for Oracle using the same values that you use with sqlplus. If you are not using SQLNet (and you have ORACLE. Microsoft SQL Server (Type 4 driver) To connect to Microsoft SQL Server from Java with Web. Logic j. Driver for Microsoft SQL Server, you use the same values for user and password that you use with isql. To specify the SQL Server, however, you supply the name of the computer running the SQL Server and the TCP/IP port the SQL Server is listening on. To log into a SQL Server running on a computer named mars listening on port 1. MSSQLSERVER4 sa secret mars: 1. You could omit . By default, a Microsoft SQL Server may not be listening for TCP/IP connections. Your DBA can configure it to do so. Validating a Multitier Web. Logic JDBC Connection from the Command Line Use the utils. Web. Logic Server. The t. 3dbping utility is only for testing a multitier connection, after you have verified that you have a working two- tier connection, and after you have started Web. Logic. If the two- tier JDBC driver is a Web. Logic j. Driver, you should test the two- tier connection with utils. Otherwise, see the documentation for the two- tier JDBC driver to find out how to test that connection before you test the multitier connection. Syntax $ java utils. URL user password DB driver. DB Name of the database. Use the same values and format that are shown above for testing a two- tier connection. For instance, if you are using Web. Logic j. Driver for Oracle on the server side, the driver class name is weblogic. Driver. Note that the class name of the driver is in dot- notation format. For instance, if you are using Web. Logic j. Driver for Oracle on the server side, the URL of the driver is jdbc: weblogic: oracle. Note that the URL of the driver is colon- separated. Examples. These examples are displayed on multiple lines for readability. Each example should be entered as a single command. Oracle Here is an example of how to ping the Oracle DBMS DEMO2. Web. Logic, which is listening on port 7. Web. Logic URLscott tiger // user password DEMO2. DB weblogic. jdbc. Driver // driver class jdbc: weblogic: oracle // driver URLDB2 with AS/4. Type 4 JDBC driver This example shows how to ping an AS/4. DB2 database from a workstation command shell using the IBM AS/4. Type 4 JDBC driver: $ java utils. Web. Logic URL scott tiger // user password DEMO // database com. AS4. 00. JDBCDriver // driver class jdbc: as. URLWeb. Logic j. Driver for Microsoft SQL Server (Type 4 JDBC driver) This example shows how to ping a Microsoft SQL Server database using Web. Logic j. Driver for Microsoft SQL Server: $ java utils. Web. Logic URL sa // user name abcd // password hostname // database@hostname: port//(optional if specified// as part of the URL) weblogic. Driver // driver class jdbc: weblogic: mssqlserver. URL: database@hostname: port//(optional if used in the database parameter)Troubleshooting JDBCThe following sections provide troubleshooting tips. JDBC Connections. If you are testing a connection to Web. Logic, check the Web. Logic Server log. By default, the log is kept in a file with the following format: domain\server\server. Where domain is the root folder of the domain and server is the name of the server. The server name is used as a folder name and in the log file name. Windows. If you get an error message that indicates that the . PATH includes the 3. UNIXIf you get an error message that indicates that an . LD. Other Problems with Oracle on UNIX Check the threading model you are using. Green threads can conflict with the kernel threads used by OCI. When using Oracle drivers, Web. Logic recommends that you use native threads. You can specify this by adding the - native flag when you start Java. Thread- related Problems on UNIX On UNIX, two threading models are available: green threads and native threads. For more information, read about the JDK for the Solaris operating environment on the Sun Web site. You can determine what type of threads you are using by checking the environment variable called THREADS. If this variable is not set, you can check the shell script in your Java installation bin directory. Some of the problems are related to the implementation of threads in the JVM for each operating system. Not all JVMs handle operating- system specific threading issues equally well. Here are some hints to avoid thread- related problems: If you are using Oracle drivers, use native threads. If you are using HP UNIX, upgrade to version 1. JVM in earlier versions, such as HP UX 1. On HP UNIX, the new JDK does not append the green- threads library to the SHLIB. The current JDK can not find the shared library (. SHLIB. To check the current value of SHLIB. For the shared library to be recognized in a location that is not part of your SHLIB. Closing JDBC Objects. BEA Systems recommends—and good programming practice dictates—that you always close JDBC objects, such as Connections, Statements, and Result. Sets, in a finally block to make sure that your program executes efficiently. Here is a general example: try . This document describes problems you may encounter and suggests solutions for them. The operating system loader looks for the libraries in different locations. How the loader works differs across the different flavors of UNIX. The following sections describe Solaris and HP- UX. Web. Logic j. Driver for Oracle. Use the procedures for setting your shared libraries as described in this document. The actual path you specify will depend on your Oracle client version, your Oracle Server version and other factors. For details, see Installing Web. Logic j. Driver for Oracle. Solaris To find out which dynamic libraries are being used by an executable you can run the ldd command for the application. If the output of this command indicates that libraries are not found, then add the location of the libraries to the LD. After installing Web. Logic Server, make sure that the shared library permissions are set correctly with the chmod command. Here is an example to set the correct permissions for HP- UX 1. WL. First, make sure that the WL. If you still have problems, use the chatr command to specify that the application should search directories in the SHLIB. The +s enabled option sets an application to search the SHLIB. Here is an example of this command, run on the Web. Logic j. Driver for Oracle shared library for HP- UX 1. For example, your path may look like: export SHLIB. For more instructions, see Setting Up the Environment for Using Web. Logic j. Driver for Oracle.
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