简单实现Android数据库的增删改查操作。

MySQLiteHelper.java

import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;import androidx.annotation.Nullable;public class MySQLiteHelper extends SQLiteOpenHelper {public static final String DB_NAME="bookstore.db";public static final int DB_VERSION=2;public MySQLiteHelper(@Nullable Context context){super(context,DB_NAME,null,DB_VERSION);}@Overridepublic void onCreate(SQLiteDatabase sqLiteDatabase) {updateMyDatabase(sqLiteDatabase,0,DB_VERSION);}public static void insertBook(SQLiteDatabase sqLiteDatabase,String name,String isbn,String description,int imageId){ContentValues contentValues=new ContentValues();contentValues.put("NAME",name);contentValues.put("DESCRIPTION",description);contentValues.put("ISBN",isbn);contentValues.put("IMAGE_ID",imageId);sqLiteDatabase.insert("BOOK",null,contentValues);}@Overridepublic void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {}public void updateMyDatabase(SQLiteDatabase sqLiteDatabase,int i,int i1){if (i<1){sqLiteDatabase.execSQL("CREATE TABLE BOOK(_id INTEGER PRIMARY KEY AUTOINCREMENT," +"NAME TEXT,ISBN TEXT,DESCRIPTION TEXT,IMAGE_ID INTEGER)");insertBook(sqLiteDatabase,"Android移动应用基础教程","9787113252502","本书是第一本Android入门书籍，共15章", R.drawable.book1);insertBook(sqLiteDatabase,"Android第一行代码（第二版）","978711343434","本书案例非常实用，深入浅出",R.drawable.book2);insertBook(sqLiteDatabase,"Head First Android开发","9787113544356","开发Android应用的快速指南和参考书",R.drawable.book3);}if (i<2){}}
}

BookCategoryActivity.java

package com.example.computerbookstore;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;public class BookCategoryActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_book_category);ListView listBook = findViewById(R.id.list_item);SQLiteOpenHelper helper = new MySQLiteHelper(this);try {SQLiteDatabase db = helper.getWritableDatabase();Cursor cursor = db.query("BOOK", new String[]{"_id","NAME"},null, null,null,null,null);SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,android.R.layout.simple_list_item_1, cursor, new String[]{"NAME"},new int[]{android.R.id.text1}, 0);listBook.setAdapter(adapter);} catch (SQLiteException e) {Toast.makeText(this, "数据库不能被创建", Toast.LENGTH_LONG).show();}listBook.setOnItemClickListener(this);}@Overridepublic void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {Intent intent = new Intent(this, BookActivity.class);intent.putExtra(BookActivity.EXTRA_BOOKID, (int) l);startActivity(intent);}}

BookActivity.java

package com.example.computerbookstore;import androidx.appcompat.app.AppCompatActivity;import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;import java.util.jar.Attributes;public class BookActivity extends AppCompatActivity {public static final String EXTRA_BOOKID="bookId";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_book);EditText etName=findViewById(R.id.et_name);EditText etIsbn=findViewById(R.id.et_isbn);EditText etdescription=findViewById(R.id.et_description);ImageView ivBook=findViewById(R.id.imageView);Button btx=findViewById(R.id.button);Button bts=findViewById(R.id.button2);SQLiteOpenHelper helper=new MySQLiteHelper(this);int bookId=getIntent().getIntExtra(EXTRA_BOOKID,0);try {SQLiteDatabase sqLiteDatabase=helper.getReadableDatabase();Cursor cursor=sqLiteDatabase.query("BOOK",new String[]{"NAME","ISBN","DESCRIPTION","IMAGE_ID"},"_id=?",new String[]{Integer.toString(bookId)},null,null,null);if (cursor.moveToFirst()){String name=cursor.getString(0);etName.setText(name);String isbn=cursor.getString(1);etIsbn.setText(isbn);String description=cursor.getString(2);etdescription.setText(description);int id=cursor.getInt(3);ivBook.setImageResource(id);}cursor.close();sqLiteDatabase.close();}catch (SQLException e){Toast.makeText(this, "数据库创建失败", Toast.LENGTH_SHORT).show();}try {bts.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {SQLiteDatabase sqLiteDatabase = helper.getWritableDatabase();sqLiteDatabase.delete("BOOK", "_id=?", new String[]{Integer.toString(bookId)});}});}catch (SQLException e){Toast.makeText(this,"此书信息已被删除",Toast.LENGTH_SHORT).show();}try {btx.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {SQLiteDatabase sqLiteDatabase=helper.getWritableDatabase();ContentValues isbnValues=new ContentValues();ContentValues nameValues=new ContentValues();ContentValues descriptionValues=new ContentValues();isbnValues.put("ISBN",etIsbn.getText().toString());sqLiteDatabase.update("BOOK",isbnValues,"_id=?",new String[]{Integer.toString(bookId)});nameValues.put("NAME",etName.getText().toString());sqLiteDatabase.update("BOOK",nameValues,"_id=?",new String[]{Integer.toString(bookId)});descriptionValues.put("DESCRIPTION",etdescription.getText().toString());sqLiteDatabase.update("BOOK",descriptionValues,"_id=?",new String[]{Integer.toString(bookId)});}});}catch (SQLException e){Toast.makeText(this,"修改成功",Toast.LENGTH_SHORT).show();}}
}

activity_book.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"android:orientation="vertical"android:layout_height="match_parent"tools:context=".BookActivity"><ImageViewandroid:id="@+id/imageView"android:layout_width="match_parent"android:layout_height="wrap_content"app:srcCompat="@drawable/book1" /><TextViewandroid:id="@+id/tv_name"android:layout_width="85dp"android:layout_height="60dp"android:gravity="center"android:layout_centerVertical="true"android:layout_below="@id/imageView"android:textSize="18sp"android:layout_marginTop="2dp"android:text="书籍名称: " /><EditTextandroid:id="@+id/et_name"android:layout_width="match_parent"android:layout_height="60dp"android:layout_toRightOf="@id/tv_name"android:layout_below="@id/imageView"android:ems="100" /><TextViewandroid:id="@+id/tv_isbn"android:layout_width="85dp"android:gravity="center"android:layout_height="60dp"android:textSize="18sp"android:layout_below="@id/tv_name"android:text="ISBN: " /><EditTextandroid:id="@+id/et_isbn"android:layout_width="match_parent"android:layout_height="60dp"android:layout_below="@id/et_name"android:layout_toRightOf="@id/tv_isbn"android:ems="100" /><TextViewandroid:id="@+id/tv_description"android:layout_width="85dp"android:layout_height="60dp"android:gravity="center"android:textSize="18sp"android:layout_below="@id/tv_isbn"android:text="书籍简介: " /><EditTextandroid:id="@+id/et_description"android:layout_width="match_parent"android:layout_height="60dp"android:layout_below="@id/et_isbn"android:layout_toRightOf="@id/tv_description"android:ems="100" /><Buttonandroid:id="@+id/button"android:layout_marginLeft="20dp"android:layout_width="80dp"android:layout_height="50dp"android:padding="10dp"android:layout_below="@id/et_description"android:text="修改" /><Buttonandroid:id="@+id/button2"android:layout_width="80dp"android:layout_height="50dp"android:layout_marginRight="20dp"android:padding="10dp"android:layout_alignParentRight="true"android:layout_below="@id/et_description"android:text="删除" /></RelativeLayout>

activity_book_category.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"android:orientation="vertical"android:layout_height="match_parent"tools:context=".BookActivity"><ImageViewandroid:id="@+id/imageView"android:layout_width="match_parent"android:layout_height="wrap_content"app:srcCompat="@drawable/book1" /><TextViewandroid:id="@+id/tv_name"android:layout_width="85dp"android:layout_height="60dp"android:gravity="center"android:layout_centerVertical="true"android:layout_below="@id/imageView"android:textSize="18sp"android:layout_marginTop="2dp"android:text="书籍名称: " /><EditTextandroid:id="@+id/et_name"android:layout_width="match_parent"android:layout_height="60dp"android:layout_toRightOf="@id/tv_name"android:layout_below="@id/imageView"android:ems="100" /><TextViewandroid:id="@+id/tv_isbn"android:layout_width="85dp"android:gravity="center"android:layout_height="60dp"android:textSize="18sp"android:layout_below="@id/tv_name"android:text="ISBN: " /><EditTextandroid:id="@+id/et_isbn"android:layout_width="match_parent"android:layout_height="60dp"android:layout_below="@id/et_name"android:layout_toRightOf="@id/tv_isbn"android:ems="100" /><TextViewandroid:id="@+id/tv_description"android:layout_width="85dp"android:layout_height="60dp"android:gravity="center"android:textSize="18sp"android:layout_below="@id/tv_isbn"android:text="书籍简介: " /><EditTextandroid:id="@+id/et_description"android:layout_width="match_parent"android:layout_height="60dp"android:layout_below="@id/et_isbn"android:layout_toRightOf="@id/tv_description"android:ems="100" /><Buttonandroid:id="@+id/button"android:layout_marginLeft="20dp"android:layout_width="80dp"android:layout_height="50dp"android:padding="10dp"android:layout_below="@id/et_description"android:text="修改" /><Buttonandroid:id="@+id/button2"android:layout_width="80dp"android:layout_height="50dp"android:layout_marginRight="20dp"android:padding="10dp"android:layout_alignParentRight="true"android:layout_below="@id/et_description"android:text="删除" /></RelativeLayout>

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Android Studio数据库增删改查。

简单实现Android数据库的增删改查操作。

MySQLiteHelper.java

BookCategoryActivity.java

BookActivity.java

activity_book.xml

activity_book_category.xml

Android Studio数据库增删改查。相关推荐

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