Java获取mysql多条数据
时间: 2023-11-18 19:03:47 浏览: 45
可以使用Java的JDBC API来获取MySQL数据库中的多条数据,具体步骤如下:
1. 加载JDBC驱动程序,例如:
```java
Class.forName("com.mysql.jdbc.Driver");
```
2. 建立与MySQL数据库的连接,例如:
```java
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "password");
```
3. 创建Statement对象,用于执行SQL语句,例如:
```java
Statement stmt = conn.createStatement();
```
4. 执行SQL查询语句,例如:
```java
ResultSet rs = stmt.executeQuery("SELECT * FROM user");
```
5. 遍历ResultSet结果集,获取每一条数据,例如:
```java
while (rs.next()) {
int id = rs.getInt("id");
String name = rs.getString("name");
int age = rs.getInt("age");
System.out.println("id: " + id + ", name: " + name + ", age: " + age);
}
```
完整的Java代码示例如下:
```java
import java.sql.*;
public class Test {
public static void main(String[] args) throws SQLException, ClassNotFoundException {
// 加载JDBC驱动程序
Class.forName("com.mysql.jdbc.Driver");
// 建立与MySQL数据库的连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "password");
// 创建Statement对象
Statement stmt = conn.createStatement();
// 执行SQL查询语句
ResultSet rs = stmt.executeQuery("SELECT * FROM user");
// 遍历ResultSet结果集,获取每一条数据
while (rs.next()) {
int id = rs.getInt("id");
String name = rs.getString("name");
int age = rs.getInt("age");
System.out.println("id: " + id + ", name: " + name + ", age: " + age);
}
// 关闭ResultSet对象
rs.close();
// 关闭Statement对象
stmt.close();
// 关闭与MySQL数据库的连接
conn.close();
}
}
```
注意:在使用完JDBC连接后,需要及时关闭ResultSet、Statement和Connection对象,以释放资源。