Examples: Connecting to a Database

The following examples show different procedures for connecting your Java application to a database. The following example data is used:

Description	Property	Example
Name of the database user	`user`	`MONA`
Password of the database user	`password`	`RED`
Database name	`-`	`DEMODB`
Name of the database computer	`server`	`PARMA`
SQL mode	`sqlmode`	`ORACLE`

Creating a Connection Using the java.sql.DriverManager.getConnection Method

There are several ways for transferring the connection options.

Connection Options as Part of the Connection URL

You transfer the connection options as part of the Connection URL.

Syntax Syntax

"jdbc:sapdb://PARMA/DEMODB?sqlmode=ORACLE"

End of the code.

To connect to the database, call the getConnection method as follows:

Syntax Syntax

java.sql.Connection conn = java.sql.DriverManager.getConnection(url, "MONA", "RED");

End of the code.

Connection Options and Logon Data As Part of the Connection URL

You transfer the connection options as well as the database user’s name and the password as part of the connection URL.

Syntax Syntax

"jdbc:sapdb://PARMA/DEMODB?sqlmode=ORACLE&user=MONA&password=RED"

End of the code.

To connect to the database, call the getConnection method as follows:

Syntax Syntax

java.sql.Connection conn = java.sql.DriverManager.getConnection (url);

End of the code.

Using the java.util.Properties Class

The connection options, name and password of the database user are transferred in an object of the java.util.Properties class.

The connection URL, url has the following content:

Syntax Syntax

```
"jdbc:sapdb://PARMA/DEMODB"
```

End of the code.

Create an object of the class java.util.Properties:
Syntax
1. ```
java.util.Properties properties = new java.util.Properties ();
```
End of the code.

Define the connection options:

Syntax Syntax

properties.setProperty ("user", "MONA");
properties.setProperty ("password", "RED");
properties.setProperty ("sqlmode", "ORACLE");

End of the code.

To connect to the database, call the getConnection method as follows:
Syntax
1. ```
java.sql.Connection conn = java.sql.DriverManager.getConnection (url, properties);
```
End of the code.

Connecting Using the com.sap.dbtech.jdbcext.DataSourceSapDB Class

Syntax Syntax

import java.sql.Connection;
import java.sql.Statement;
import java.sql.SQLException;
import javax.sql.DataSource;
import java.sql.ResultSet;
import com.sap.dbtech.jdbcext.DataSourceSapDB;

public final class HelloDataSource
{
	public static void main (String[] args) throws SQLException
 		{
				String dbUser = "MONA";
				String password = "RED";
				String  dbName = "DEMODB";
				String  dbServer = "PARMA";
				DataSourceSapDB ds = zero;

				ds = new DataSourceSapDB();
				ds.setUser(dbUser);
				ds.setPassword(password);
				ds.setDatabaseName(dbName);
				ds.setServer(dbServer);

				Connection c = ds.getConnection();
				Statement s = c.createStatement();
				ResultSet rs = s.executeQuery("SELECT * FROM HOTEL.CITY");
				rs.next();
				System.out.println(rs.getString(1));
				return;
		}
}

End of the code.

More Information

Connecting to a Database

java.sql.DriverManager.getConnection Method

com.sap.dbtech.jdbcext.DataSourceSapDB Class