使用statement访问MySQL数据库执行查询操作
package study;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBCdemo {
private final String USERNAME = "root";
private final String PASSWORD = "123456";
private final String URL = "jdbc:mysql://localhost:3306/test?serverTimezone=UTC";
Connection connection = null;
Statement statement = null;
ResultSet rs = null;
public void query() { // 查询方法
try {
Class.forName("com.mysql.cj.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
statement = connection.createStatement();
String sql = "select * from user";
rs = statement.executeQuery(sql);
while (rs.next()) { // 查询
System.out.print(rs.getInt("uid") + "\t");
System.out.print(rs.getString("uname") + "\t");
System.out.print(rs.getString("usex") + "\t");
System.out.println("操作成功");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {//后打开的先关闭
try {
if (rs != null)
rs.close();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
if (statement != null)
statement.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
if (connection != null)
connection.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
执行结果如下: