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Potential Errors When Compiling or Executing JDBCOldStyleConnection
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You may encounter some problems when compiling or executing JDBCOldStyleConnection. If this happens, please ensure that you have the correct version of the JDK (JDK 1.4.1 or above) and that your PATH environment variable points to the correct version of the JDK. In particular, you can check the version of your JDK as follows: B:\>java -version java version "1.4.2_05" Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04) Java HotSpot(TM) Client VM (build 1.4.2_05-b04, mixed mode) You should also be working with the correct version of Oracle (10g or 9i Release 2). Table 3-5, on the following page, lists some other errors that you may encounter when compiling or executing the program JDBCOldStyleConnection, along with the possible causes and actions you can take to remedy the errors.
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Using a Data Source
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JDBC 2.0 introduced the concept of data sources that are standard objects for specifying a source of data such as an Oracle database. As mentioned earlier, this is a more flexible way of establishing a database connection than the method using DriverManager discussed in the previous section. Let s look at the DataSource interface and its properties.
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DataSource Interface and Properties
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In JDBC, a data source is a class that implements the interface javax.sql.DataSource, the main two methods of which are as follows. (In case of Oracle, the class that implements this interface is oracle.jdbc.pool.OracleDataSource.) public interface DataSource { Connection getConnection() throws SQLException; Connection getConnection(String username, String password) throws SQLException; ... }
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Table 3-5. Potential Errors While Compiling or Executing JDBCOldStyleConnection and Their Fixes
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See earlier sections on setting up the required environment variables. Your CLASSPATH is not set properly.
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Error Message (Trimmed)
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Compilation
> javac JDBCOldStyleConnection.java JDBCOldStyleConnection.java:6: package oracle.jdbc does not exist import oracle.jdbc.OracleDriver; . . . ^
Execution
ERROR: Could not get connection! Exiting .. ORACLE_HOME and/or java.sql.SQLException: ORA-12154: TNS:could not resolve the ORACLE_SID is not set. connect identifier specified at oracle.jdbc.driver.DatabaseError.throwSqlException (DatabaseError.java:125) . . . at JDBCOldStyleConnection.main(JDBCOldStyleConnection.java:106) The Oracle listener may be down, or the database may be down.
Set ORACLE_HOME and ORACLE_SID appropriately (required for the OCI driver only).
Execution
ERROR: Could not get connection! Exiting .. java.sql.SQLException: Io exception: The Network Adapter could not establish the connection at . . .
Start the database if it is down; start the listener using the following command (see Oracle Database Net Services Administrator s Guide [10g Release 1] for more details): $ORACLE_HOME/bin/lsnrctl start Set the NLS_LANG environment variable as discussed in the section JDBC OCI Driver on UNIX and Windows (10g Only).
Execution
ERROR: Could not get connection! Exiting .. java.sql.SQLException: ORA-12705: invalid or unknown NLS parameter value specified . . .
NLS_LANG is not set and is required for the OCI driver connection . to work The username or password is invalid.
CHAPTER 3 INTRODUCTION TO JDBC
Execution
ORA-01017: invalid username/password; logon denied java.sql.SQLException: ORA-01017: invalid username/password; logon denied at oracle.jdbc.driver.DatabaseError.throwSqlException
Double-check the username or password; try connecting using the same username and password through SQL*Plus. If the SCOTT user does not exist, install it by running %ORACLE_HOME/ sqlplus/demo/demobld.sql as the sys user (or see the section Setting Up the SCOTT/TIGER Schema of 1).
CHAPTER 3 INTRODUCTION TO JDBC
The OracleDataSource class provides a set of properties that can be used to specify a database to connect to (we will cover this topic shortly). Table 3-6 shows the standard JDBC data source properties implemented by OracleDataSource. Table 3-6. Standard DataSource Properties
Name
databaseName dataSourceName
Data Type
String String
Description
Name of the particular database on the server; also known as the SID in Oracle terminology. Name of the underlying data source class (for connection pooling, this is an underlying pooled connection data source class). Description of the data source. Network protocol for communicating with the server. For Oracle, this applies only to the OCI drivers and defaults to tcp (other possible settings include ipc; see Oracle Database Net Services Administrator s Guide [10g Release 1] for more information). Login password for the username. Number of the port where the server listens for requests. Name of the database server. Name for the login account.
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