android成功增进数据库
bean
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package Bean;
public class causebean {
public String getCoursenumber() {
return coursenumber;
}
public void setCoursenumber(String coursenumber) {
this.coursenumber = coursenumber;
}
public String getCoursename() {
return coursename;
}
public void setCoursename(String coursename) {
this.coursename = coursename;
}
public String getTeacher() {
return teacher;
}
public void setTeacher(String teacher) {
this.teacher = teacher;
}
public String getPlace() {
return place;
}
public void setPlace(String place) {
this.place = place;
}
private String coursenumber;
private String coursename;
private String teacher;
private String place;
}
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mainactivity
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package com.hui.application3;
import android.annotation.SuppressLint;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import Bean.causebean;
import JDBCUtils.utils;
import android.os.AsyncTask;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class MainActivity extends AppCompatActivity {
private EditText etCourseNumber;
private EditText etCourseName;
private EditText etTeacher;
private EditText etPlace;
private Button btnAdd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etCourseNumber = findViewById(R.id.etCourseNumber);
etCourseName = findViewById(R.id.etCourseName);
etTeacher = findViewById(R.id.etTeacher);
etPlace = findViewById(R.id.etPlace);
btnAdd = findViewById(R.id.btnAdd);
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
addCourseToDatabase();
}
});
}
private void addCourseToDatabase() {
String courseNumber = etCourseNumber.getText().toString().trim();
String courseName = etCourseName.getText().toString().trim();
String teacher = etTeacher.getText().toString().trim();
String place = etPlace.getText().toString().trim();
if (courseNumber.isEmpty() || courseName.isEmpty() || teacher.isEmpty() || place.isEmpty()) {
Toast.makeText(this, "请填写完整的课程信息", Toast.LENGTH_SHORT).show();
return;
}
causebean bean = new causebean();
bean.setCoursenumber(courseNumber);
bean.setCoursename(courseName);
bean.setTeacher(teacher);
bean.setPlace(place);
SaveCourseTask task = new SaveCourseTask();
task.execute(bean);
}
private class SaveCourseTask extends AsyncTask<causebean, Void, Boolean> {
@Override
protected Boolean doInBackground(causebean... params) {
// causebean bean = params[0];
// Connection connection = null;
// PreparedStatement statement = null;
//
// try {
// // 获取数据库连接
// connection = utils.getConnection();
//
// // 创建 SQL 插入语句
// String sql = "INSERT INTO qz3 (coursenumber, coursename, teacher, place) VALUES (?, ?, ?, ?)";
//
// // 创建 PreparedStatement 对象
// statement = connection.prepareStatement(sql);
// statement.setString(1, bean.getCoursenumber());
// statement.setString(2, bean.getCoursename());
// statement.setString(3, bean.getTeacher());
// statement.setString(4, bean.getPlace());
//
// // 执行插入操作
// statement.executeUpdate();
//
// // 提交事务
// connection.commit();
//
// return true;
//
// } catch (SQLException e) {
// e.printStackTrace();
// return false;
// } finally {
// // 关闭 PreparedStatement 和 Connection
// if (statement != null) {
// try {
// statement.close();
// } catch (SQLException e) {
// e.printStackTrace();
// }
// }
// if (connection != null) {
// try {
// connection.close();
// } catch (SQLException e) {
// e.printStackTrace();
// }
// }
// }
causebean bean = params[0];
try {
// 获取数据库连接
Connection connection = utils.getConnection();
if (connection != null) {
// 创建 SQL 插入语句
String sql = "INSERT INTO qz3 (coursenumber, coursename, teacher, place) VALUES (?, ?, ?, ?)";
// 创建 PreparedStatement 对象
PreparedStatement statement = connection.prepareStatement(sql);
statement.setString(1, bean.getCoursenumber());
statement.setString(2, bean.getCoursename());
statement.setString(3, bean.getTeacher());
statement.setString(4, bean.getPlace());
// 执行插入操作
statement.executeUpdate();
// 提交事务
connection.commit();
// 关闭 PreparedStatement 和 Connection
statement.close();
connection.close();
return true;
} else {
return false;
}
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
@Override
protected void onPostExecute(Boolean success) {
if (success) {
// 数据保存成功
Toast.makeText(MainActivity.this, "课程添加成功", Toast.LENGTH_SHORT).show();
etCourseNumber.setText("");
etCourseName.setText("");
etTeacher.setText("");
etPlace.setText("");
} else {
// 数据保存失败
Toast.makeText(MainActivity.this, "课程添加失败", Toast.LENGTH_SHORT).show();
}
}
}
}
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utils
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package JDBCUtils;
import android.annotation.SuppressLint;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class utils {
public static String url = "jdbc:mysql://192.168.17.1:3306/mydb2?useUnicode=true&characterEncoding=utf-8";
public static final String username = "root";
public static final String password = "Zcxy1029";
public static ThreadLocal<Connection> tl = new ThreadLocal<>();
public static Connection getConnection() throws SQLException, ClassNotFoundException {
Connection conn = tl.get();
//需要加上这个conn.isClosed()条件，你每次添加一条就关闭了数据库连接，所以需要判断如果数据库关闭了，要重新连接
if (conn == null || conn.isClosed()) {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url, username, password);
tl.set(conn);
conn.setAutoCommit(false);
} else {
}
return conn;
}
}
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xml
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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="16dp">
<EditText
android:id="@+id/etCourseNumber"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="课程编号" />
<EditText
android:id="@+id/etCourseName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="课程名称" />
<EditText
android:id="@+id/etTeacher"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="教师姓名" />
<EditText
android:id="@+id/etPlace"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="上课地点" />
<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="添加课程" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
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