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driverName dbURL dbUsername dbPassword
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JDBC driver Database URL (uniquely identifies a database) Database username Database user password
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If you are using the JDBC-ODBC bridge driver, the JDBC URL will start with jdbc:odbc:. The rest of the URL is generally your data source name or database system. So, if you are using ODBC to access an ODBC data source called Payroll, for example, your JDBC URL could be jdbc:odbc:Payroll. In place of dbUsername, you put the name you use to log into the relational DBMS; in place of dbPassword, you put the dbUsername s password for the DBMS. So, if you log into your DBMS with a login name of scott and a password of tiger, just the lines of code shown will establish a connection: /** * Attempts to establish a connection to the given database * URL. The DriverManager attempts to select an appropriate * driver from the set of registered JDBC drivers. */ String dbURL = "jdbc:odbc:Payroll"; String dbUsername = "scott"; String dbPassword = "tiger"; Connection conn = null; try { // // when the method getConnection is called, the // DriverManager will attempt to locate a suitable // driver from amongst those loaded at initialization // and those loaded explicitly using the same class loader // as the current applet or application. // conn = DriverManager.getConnection(dbURL, dbUsername, dbPassword); // use the Connection object } catch(SQLException e) { // if a database access error occurs // handle the exception here. e.printStackTrace(); ... }
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CHAPTER 3 MAKING DATABASE CONNECTIONS
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finally { // close the db resources such as Connection object DatabaseUtil.close(conn); } Each vendor has a special format for the database URL. For example, Table 3-3 shows sample database driver names and sample database URLs. (In Table 3-3, the server name is localhost, and the database name is scorpian.) Table 3-3. Vendor URL Formats
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Oracle 8i Oracle 9i MySQL Microsoft Access Sybase (jConnect 4.2) Sybase (jConnect 5.2) MS SQL Server 2000 MS SQL Server 2000 IBM DB2
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oracle.jdbc.driver.OracleDriver oracle.jdbc.driver.OracleDriver org.gjt.mm.mysql.Driver sun.jdbc.odbc.JdbcOdbcDriver com.sybase.jdbc.SybDriver com.sybase.jdbc2.jdbc.SybDriver com.microsoft.jdbc. sqlserver.SQLServerDriver weblogic.jdbc.mssqlserver4.Driver COM.ibm.db2.jdbc.net.DB2Connection
URL Sample
jdbc:oracle:thin:@localhost: 1521:scorpian jdbc:oracle:thin:@localhost: 1521:scorpian jdbc:mysql://localhost/scorpian jdbc:odbc:scorpian jdbc:sybase:Tds:scorpian:2638 jdbc:sybase:Tds:scorpian:2638 jdbc:microsoft:sqlserver:// localhost:1433 jdbc:weblogic:mssqlserver4:database@ localhost:port jdbc:db2://localhost:6789/scorpian
If you are using a JDBC driver developed by a third party, the documentation will tell you what to use for the driver name and the database URL format.
Method 2: Making the Connection
In this method, you add connection options to the end of the database URL. In using getConnection(String url), the dbUsername and dbPassword values are appended to the database URL. For example, one way of connecting to a database is through the JDBC driver manager using the method DriverManager.getConnection. This method uses a string containing a URL. The following is an example of using the JDBC driver manager to connect to Microsoft SQL Server 2000 while passing the username and password (as appended to the end of the URL): Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver"); String dbURL = "jdbc:microsoft:sqlserver://localhost:1433;User=sa;Password=admin"; Connection conn = DriverManager.getConnection(dbURL); For Microsoft SQL Server, the complete connection URL format used with the driver manager is as follows: jdbc:microsoft:sqlserver://hostname:port[;property=value...]
CHAPTER 3 MAKING DATABASE CONNECTIONS
where the following is true: hostname: Specifies the TCP/IP address or TCP/IP hostname (the assumption is that your network resolves hostnames to IP addresses) of the server to which you are connecting. port: Specifies the database server port property=value: Specifies connection properties Appending dbUsername and dbPassword values to the end of the database URL might cause unnecessary errors because of the creation of long strings. (For example, you might forget to separate the fields with a semicolon.)
Method 3: Making the Connection
In this third and final method that I will explain, you can set connection information in a java.util. Properties object and pass this information to the DriverManager.getConnection() method. With this approach, you do not need to append dbUsername and dbPassword values to the end of the dbURL. Instead of appending values to the end of the dbURL, you put these values as a set of (key,value) into an instance of the java.util.Properties object. The following example specifies the server, user, and password in a Properties object: public static final String DATABASE_USER = "user"; public static final String DATABASE_PASSWORD = "password"; String oracleDriver = "oracle.jdbc.driver.OracleDriver"; Class.forName(oracleDriver); String dbURL = "jdbc:oracle:thin:@localhost:1521:scorpian"; String dbUsername = "scott"; String dbPassword = "tiger"; // these are properties that get passed // to DriverManager.getConnection(...) java.util.Properties dbProperties = new java.util.Properties(); jdbcProperties.put(DATABASE_USER, dbUsername); jdbcProperties.put(DATABASE_PASSWORD, dbPassword); Connection conn = DriverManager.getConnection(dbURL, dbProperties); Using the getConnection(String url, Properties info), you can pass additional parameters (such as Character Encoding Scheme) to the database as a set of (key,value) pairs.
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