Oracle 12c JDBC 连接

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Test {
private static Connection getConn() {
String driver = "oracle.jdbc.driver.OracleDriver";
//String url = "jdbc:oracle:thin:@127.0.0.1:1521:pdbmyoracle";// 设置连接字符串
String url = "jdbc:oracle:thin:@//127.0.0.1:1521/pdbmyoracle";
String username = "abc";// 用户名
String password = "abc";// 密码
Connection conn = null; // 创建数据库连接对象
try {
Class.forName(driver);
conn = DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}

return conn;
}

private static void query() {
Connection conn = getConn();
String sql = "select * from users";
PreparedStatement pstmt;
try {
pstmt = conn.prepareStatement(sql);
// 建立一个结果集,用来保存查询出来的结果

ResultSet rs = pstmt.executeQuery();

while (rs.next()) {
String username = rs.getString("USERNAME");
System.out.println(username);
}
rs.close();
pstmt.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

public static void main(String[] args) {

query();
}

}