Java uses JDBC to connect to any type of Database (mysql oracle ..), Oraclejdbc
Package cn. liz. test; import java. io. inputStream; import java. SQL. connection; import java. SQL. driver; import java. SQL. SQLException; import java. util. properties; import org. junit. test; public class JBDCtest {/*** compile a common method to obtain the connection of any database without modifying the source program * solution: put the full class name, url, user, and password of the database Driver implementation class into a * configuration file, and decouple it from the specific database by modifying the configuration file. * @ throws Exception */public Connection getConnection () throws Exception {String driverClass = null; String jdbcUrl = null; String user = null; String password = null; // read the jdbc in the class path. properties file InputStream in = getClass (). getClassLoader (). getResourceAsStream ("jdbc. properties "); Properties properties = new Properties (); properties. load (in); driverClass = properties. getProperty ("driver"); jdbcUrl = properties. getProperty ("jdbcUrl"); user = properties. getProperty ("user"); password = properties. getProperty ("password"); // common Driver objects are reflected by reflection. driver driver = (Driver) Class. forName (driverClass ). newInstance (); Properties info = new Properties (); info. put ("user", user); info. put ("password", password); // obtain the database connection through the connect Method of the Driver. connection connection = driver. connect (jdbcUrl, info); return connection ;}@ Testpublic void testGetConnection () throws Exception {System. out. println (getConnection () ;}< span style = "white-space: pre"> </span>
<Span style = "font-family: Arial, Helvetica, sans-serif;"> jdbc. properties </span> configuration file:
#driver=oracle.jdbc.driver.OracleDriver#jdbcUrl=jdbc:oracle:thin:@localhost:1521:orcl#user=scott#password=javadriver=com.mysql.jdbc.DriverjdbcUrl=jdbc:mysql://localhost:3306/testuser=rootpassword=
Java JDBC connects to different database writing methods SQL, oracle and mysql JDBC connects to various database writing methods for Java beginners. I suggest you remember to import the corresponding driver jar package.
1. Oracle8/8i/9i Database (thin Mode)
Class. forName ("oracle. jdbc. driver. oracleDriver "). newInstance (); String url = "jdbc: oracle: thin: @ localhost: 1521: orcl"; // orcl database SID String user = "test "; string password = "test"; Connection conn = DriverManager. getConnection (url, user, password );
2. DB2 database
Class. forName ("com. ibm. db2.jdbc. app. DB2Driver "). newInstance (); String url = "jdbc: db2: // localhost: 5000/sample"; // sample Database Name String user = "admin"; String password = ""; connection conn = DriverManager. getConnection (url, user, password); 3. SQL Server7.0/2000 database
Class. forName ("com. microsoft. jdbc. sqlserver. SQLServerDriver "). newInstance (); String url = "jdbc: microsoft: sqlserver: // localhost: 1433; DatabaseName = mydb"; // mydb database String user = "sa "; string password = ""; Connection conn = DriverManager. getConnection (url, user, password );
4. Sybase Database
Class. forName ("com. sybase. jdbc. sybDriver "). newInstance (); String url = "jdbc: sybase: Tds: localhost: 5007/myDB"; // myDB database name Properties sysProps = System. getProperties (); SysProps. put ("user", "userid"); SysProps. put ("password", "user_password"); Connection conn = DriverManager. getConnection (url, SysProps );
5. Informix Database
Class. forName ("com. informix. jdbc. ifxDriver "). newInstance (); String url = "jdbc: informix-sqli: // 123.45.67.89: 1533/myDB: INFORMIXSERVER = myserver; user = testuser; password = testpassword "; // myDB database name Connection conn = DriverManager. getConnection (url );
6. MySQL database
Class. forName ("org. gjt. mm. mysql. Driver"). newInstance (); String url = "jdbc: mysql: // localhost/myDB? User = soft & password = soft1234 & useUnicode = true & characterEncoding = 8859_1 "// myDB database name Connection conn = DriverManager. getConnection (url); or
Class. forName ("com. mysql. jdbc. Driver"); String url = "jdbc: mysql: // localhost/myDB? Ser = root & password = system "; conn = DriverManager. getConnection (url );
7. PostgreSQL database
Class. forName ("org. postgresql. driver "). newInstance (); String url = "jdbc: postgresql: // localhost/myDB" // myDB database name String user = "myuser"; String password = "mypassword "; connection conn = DriverManager. getConnection (url, user, password); supplement: SQL Server2005 Database
Class. forName ("com. microsoft. jdbc. sqlserver. SQLServerDriver "). newInstance (); String url = "jdbc: sqlserver: // localhost: 1433; DatabaseName = mydb"; // mydb database String user = "sa"; String password = ""; connection conn = DriverManager. getConnection (url, user, password );
The connection url is a little different from the connection url of sql2000. The JDBC connection method is basically the above.
There are quite a few searches on the Internet. Oh, DriverClass is better to write through the package.
The main url has also changed the corresponding settings of the current database.
When JAVA uses JDBC to connect to the MYSQL database, it establishes another connection object using different database methods to operate the same database.
Url1 = "jdbc: Mysql: // 127.0.0.1: 3306/comm ";
Url2 = "jdbc: Mysql: // 127.0.0.1: 3306/swj2 ";
...
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DbConnection1 = DriverManager. getConnection (url1, user, password );
DbConnection2 = DriverManager. getConnection (url2, user, password );
