java连接MySQL数据库(jdbc)
时间:2021-07-01 10:21:17
帮助过:2人阅读
zp.itcase.JDBCdemo;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBCDemo3 {
public static void main(String[] args) {
Statement stmt =
null;
Connection conn =
null;
try {
// 1.注册驱动
Class.forName("com.mysql.jdbc.Driver"
);
// 2.获取连接对象
conn = DriverManager.getConnection("jdbc:mysql:///db3", "root", "root"
);
// 3. 定义sql
String sql = "update account set balance = 1500 where id =3"
;
// 4.获取执行sql的对象
stmt =
conn.createStatement();
// 5.执行sql
int count =
stmt.executeUpdate(sql);
// 6.处理结果
if (count > 0
) {
System.out.println("修改成功"
);
} else {
System.out.println("修改失败"
);
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (stmt !=
null) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn !=
null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
}
java连接MySQL数据库(jdbc)
标签:tac sql数据库 成功 数据 stat class nts lex close