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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class JdbcTest {
/**
* @param args
*/
public static void main(String[] args) {
String driver = "oracle.jdbc.driver.OracleDriver";
String url = "jdbc:oracle:thin:@127.0.0.1:1521:orcl";
String username = "scott";
String password = "tiger";
String sql = "select * from users";
Connection conn = null;
PreparedStatement pst = null;
ResultSet rs = null;
// TODO Auto-generated method stub
try {
Class.forName(driver);
conn = DriverManager.getConnection(url,username,password);
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
while(rs.next()){
System.out.println(rs.getString("username"));
System.out.println(rs.getString("password"));
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
rs.close();
pst.close();
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
System.out.println("rs's closing is :"+rs.isClosed());
System.out.println("pst's closing is :"+pst.isClosed());
System.out.println("conn's closing is :"+conn.isClosed());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DB {
public static void main(String[] args) {
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost/db?user=root&password=");
System.out.println(conn);
pstmt = conn.prepareStatement("select * from person");
rs = pstmt.executeQuery();
while(rs.next()) {
System.out.println(rs.getInt(1));
System.out.println(rs.getString("name"));
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
if(rs != null) {
try {
rs.close();
rs = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
if(pstmt != null) {
try {
pstmt.close();
pstmt = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
if(conn != null) {
try {
conn.close();
conn = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
}
try {
Class.forName(driver);
conn = DriverManager.getConnection(url,username,password);
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
while(rs.next()){
System.out.println(rs.getString("username"));
System.out.println(rs.getString("password"));
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
if(rs!=null)
rs.close();
if(pst!=null)
pst.close();
if(conn!=null)
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}