- 用java语言调用数据库；
前提：idea配置好jar包
字符类型：GDK UTF8等等。
增删改：
import java.sql.*;
public class mysqlconnections {
public static void main(String[] args) throws Exception {
//导入驱动包
Class.forName("com.mysql.jdbc.Driver");
//链接至数据库
String jdbc = "jdbc:mysql://192.168.23.134:3306/k?characterEncoding=UTF8";//加上了字符编码的方式
Connection conn = DriverManager.getConnection(jdbc, "root", "Tzlqq5201314.");
Statement state = conn.createStatement();//容器
// String sql ="insert into student values('7','李六','男','2000-10-02','......')";增加
// String sql ="delete from student where id = 7;";//删除
// String sql="update student set name='钟霓' where id='6' ";//修改
state.executeUpdate(sql); //将sql语句上传至数据库执行
conn.close();
}
}
查找：
import java.sql.*;
public class mysqlconnections {
public static void main(String[] args) throws Exception {
Class.forName("com.mysql.jdbc.Driver");//导入数据包
String jdbc ="jdbc:mysql://192.168.23.134:3306/k?characterEncoding=UTF8";
Connection conn = DriverManager.getConnection(jdbc,"root","Tzlqq5201314.");
Statement state =conn.createStatement();
String sql ="select * from student";
ResultSet one = state.executeQuery(sql);
while(one.next()){
System.out.println(one.getString(1)+" "+one.getString(2)+" "+one.getString(3)+" "+one.getString(4)+" "+one.getString(5));
}
conn.close();
}
}
输入账号和密码，在数据库中获取，进而登入或者显示错误
import java.sql.;
import java.util.;
public class mysqlconnections {
public static void main(String[] args) throws Exception {
Scanner scanf = new Scanner(System.in);
System.out.println("请输入账号");
String name = scanf.nextLine();
System.out.println("请输入密码");
String password = scanf.nextLine();
Class.forName("com.mysql.jdbc.Driver");//导入数据包
String jdbc = "jdbc:mysql://192.168.23.134:3306/k";//characterEncoding=UTF8
Connection conn = DriverManager.getConnection(jdbc, "root", "Tzlqq5201314.");
Statement state = conn.createStatement();
String sql = "select * from pass1 where name='" + name + "' and password='" + password + "'";
ResultSet re = state.executeQuery(sql);
if (re.next()) {
System.out.println("成功登陆！" + re.getString(1) + " 欢迎你");
} else {
System.out.println("账号或密码错误");
}
conn.close();
}
}
