3. oracle数据库的select操作，返回select后返回的第一行数据,若要返回int,只需将getString改为getInt

public static String OracleDBSelect(String sql) throws

ClassNotFoundException, SQLException{

String dbURL=”jdbc:oracle:thin:@172.16.4.21:1521:skytest”; String dbuser=”***”;

String dbpasswd=”***”;

Class.forName(”oracle.jdbc.OracleDriver”);

Connection conn = DriverManager.getConnection(dbURL,dbuser,dbpasswd); Statement stmt =

conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,

ResultSet.CONCUR_READ_ONLY);

ResultSet rs = stmt.executeQuery(sql);

rs.next();

int expbalance=rs.getString(1);

rs.close();

stmt.close();

conn.close();

return expbalance;

}

4.oralce数据的执行操作，可执行instert、delete、update等操作，不返回数据

public static void OracleDBUpdate(String sql) throws

ClassNotFoundException, SQLException{

String dbURL=”jdbc:oracle:thin:@172.16.4.21:1521:skytest”; String dbuser=”***”;

String dbpasswd=”***”;

Class.forName(”oracle.jdbc.OracleDriver”);

Connection conn = DriverManager.getConnection(dbURL,dbuser,dbpasswd); Statement stmt =

conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,

ResultSet.CONCUR_UPDATABLE);

stmt.executeUpdate(sql);

stmt.close();

conn.close();

}

5.Cassandra非关系型数据库的操作，包括delete、insert、read等。 public static void CassandraRemove(String USkyid)throws

IllegalStateException, PoolExhaustedException,Exception {

CassandraClientPool pool = CassandraClientPoolFactory.INSTANCE.get(); CassandraClient client = pool.borrowClient(”172.16.4.244″, 9160); try{