Java面試題 寫一個比較完美的JDBC 鏈接數據庫的程序

import java.sql.Connection;java

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
 
public class JDBCTest {
 
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager
.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL",
"ccug", "ccug1234");
stmt = conn.createStatement();
rs = stmt.executeQuery("select * from usr");
while (rs.next()) {
System.out.println(rs.getString("username"));
rs.getString("password");
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (rs != null) {
rs.close();
rs = null;
}
if (stmt != null) {
stmt.close();
stmt = null;
}
if (conn != null) {
conn.close();
conn = null;
}
 
} catch (SQLException e) { 
e.printStackTrace();
}
}
 
}
}
 
面試題中若是有JDBC 鏈接數據庫的題 你這麼寫就比較完美了 最好加上註釋!!!
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