tId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
@Override
public String toString() {
return "User[id=" + id + ", name=" + name + ", password=" + password + ", email=" + email + ", birthday="
+ birthday + "]";
}
}
public class DemoException {
public static void main(String[] args) {
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
try{
//这里会有加载驱动失败异常
Class.forName("com.mysql.jdbc.Driver");
//这里是连接数据库异常
String url = "jdbc:mysql://localhos:3306/myjdbc";
connection = DriverManager.getConnection(url,"root","123456");
statement = connection.createStatement();
String sql = "select * from users";
resultSet = statement.executeQuery(sql);
//创建一个集合，用于存储每条记录的当做一个对象的集合
ArrayList
list = new ArrayList<>();
while(resultSet.next()){
//这里我们创建User对象，并通过结果集对象调用获取方法对应的给对象的变量赋值
User user = new User();
user.setId(resultSet.getInt("id"));
user.setName(resultSet.getString("name"));
user.setPassword(resultSet.getString("password"));
user.setEmail(resultSet.getString("email"));
user.setBirthday(resultSet.getDate("birthday"));
//赋值完毕，添加到集合中
list.add(user);
}
//遍历打印集合中的对象数据
for(User user :list){
System.out.println(user);
}
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException("获取连接失败");
}
catch (ClassNotFoundException e) {
e.printStackTrace();
throw new RuntimeException("驱动加载失败");
}finally {
}
}
}
//这里将，获取数据库的连接方法，连接数据库异常，建立工具类便于调用
//首先，我们要先创建一个配置文件
//1.在src下创建一个文本文件，这里起名一般保存的后缀名是.properties,dbinfo.properties(文本名)
//2.数据是：
driverClass=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/myjdbc
user=root
password=123456
public class JDBCUtil {
private static String driverClass;
private static String url;
private static String user;
private static String password;
//第一种，先使用集合读取文件
Properties properties = new Properties();
try{
FileInputStream fis = new FileInputStream("src/dbinfo.propeerties");//注:这里后缀要写全
properties.load(fis);
//根据键读取对应的值
driverClass = properties,getProperty("driverClass");
url = properties.getProperty("url");
user = properties.getProperty("user");
password = properties.getProperty("password");
}catech (Exception e) {
e.printStackTrace();
}
//第二种，使用系统类来读取配置文件
//我们在静态代码块里编写读取配置文件
ResourceBundle rb = ResourceBundle.getBundle("dbinfo");//注:这里的后缀不写
//获取文件中的数据
driverClass = rb.getString("driverClass");
url = rb.getString("url