Android SQLite数据库操作

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button 
        android:id="@+id/createDatabase"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="createDatabase"/>
    <Button 
        android:id="@+id/updateDatabase"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="updateDatabase"/>
    <Button 
        android:id="@+id/insert"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="insert"/>
    <Button 
        android:id="@+id/update"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="update"/>
    <Button 
        android:id="@+id/query"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="query"/>
    <Button 
        android:id="@+id/delete"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="delete"/>
    <Button
        android:id="@+id/droptable"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="drop table"/>
</LinearLayout>

DatabaseHelper.java

package mars.sqlite.db;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class DatabaseHelper extends SQLiteOpenHelper {

    private static final int VERISON=1;
    
    public DatabaseHelper(Context context, String name, CursorFactory factory,
            int version) {
        super(context, name, factory, version);
        // TODO Auto-generated constructor stub
    }
    
    public DatabaseHelper(Context context,String name){
        this(context,name,DatabaseHelper.VERISON);
    }

    public DatabaseHelper(Context context,String name,int verison){
        this(context,name,null,verison);
    }
    
    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        System.out.println("create a database");
        db.execSQL("create table users(id int,name varchar(20))");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {
        // TODO Auto-generated method stub
        System.out.println("update a database");
    }

}

SQLiteOperation.java

package mars.activity;

import mars.sqlite.db.DatabaseHelper;
import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SQLiteOperationActivity extends Activity {
    /** Called when the activity is first created. */

    private Button createDatabase = null;
    private Button updateDatabase = null;
    private Button insert = null;
    private Button update = null;
    private Button query = null;
    private Button delete = null;
    private Button dropTable=null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        // 创建数据库
        createDatabase = (Button) this.findViewById(R.id.createDatabase);
        //设置监听器
        createDatabase.setOnClickListener(new CreateDatabaseListener());
        // 更新数据库
        updateDatabase = (Button) this.findViewById(R.id.updateDatabase);
        updateDatabase.setOnClickListener(new UpdateDatabaseListener());
        // 添加数据
        insert = (Button) this.findViewById(R.id.insert);
        insert.setOnClickListener(new InsertListener());
        // 更新数据
        update = (Button) this.findViewById(R.id.update);
        update.setOnClickListener(new UpdateListener());
        // 查询数据
        query = (Button) this.findViewById(R.id.query);
        query.setOnClickListener(new QueryListener());
        // 删除数据
        delete = (Button) this.findViewById(R.id.delete);
        delete.setOnClickListener(new DeleteListener());
        //删除表单
        dropTable=(Button) this.findViewById(R.id.droptable);
        dropTable.setOnClickListener(new DropTableListener());
    }

    // 创建数据库单击事件
    class CreateDatabaseListener implements OnClickListener {
        @Override
        public void onClick(View v) {
            DatabaseHelper dbHelper = new DatabaseHelper(
                    SQLiteOperationActivity.this, "sqlite_test_db");
            @SuppressWarnings("unused")
            SQLiteDatabase sqlDb = dbHelper.getWritableDatabase();
        }
    }

    // 更新数据库单击事件
    class UpdateDatabaseListener implements OnClickListener {
        @Override
        public void onClick(View v) {
            System.out.println("update database verison");
            DatabaseHelper dbHelper = new DatabaseHelper(
                    SQLiteOperationActivity.this, "sqlite_test_db",2);
            @SuppressWarnings("unused")
            SQLiteDatabase sqlDb = dbHelper.getWritableDatabase();
            
        }
    }

    // 添加数据单击事件
    class InsertListener implements OnClickListener {
        @Override
        public void onClick(View v) {
            System.out.println("insert");
            DatabaseHelper dbHelper = new DatabaseHelper(
                    SQLiteOperationActivity.this, "sqlite_test_db");
            SQLiteDatabase sqlDb = dbHelper.getWritableDatabase();
            ContentValues values=new ContentValues();
            values.put("id", 1);
            values.put("name", "zhangsan");
            sqlDb.insert("users", null, values);
        }
    }

    // 更新数据单击事件
    class UpdateListener implements OnClickListener {
        @Override
        public void onClick(View v) {
            System.out.println("update");
            DatabaseHelper dbHelper = new DatabaseHelper(
                    SQLiteOperationActivity.this, "sqlite_test_db");
            SQLiteDatabase sqlDb = dbHelper.getWritableDatabase();
            ContentValues values=new ContentValues();
            values.put("name", "zhangsanfeng");
            sqlDb.update("users", values, "id=?", new String[]{"1"});
        }
    }

    // 查询数据单击事件
    class QueryListener implements OnClickListener {
        @Override
        public void onClick(View v) {
            System.out.println("query");
            DatabaseHelper dbHelper = new DatabaseHelper(
                    SQLiteOperationActivity.this, "sqlite_test_db");
            SQLiteDatabase sqlDb = dbHelper.getReadableDatabase();
            Cursor cursor=sqlDb.query("users", new String[]{"name"}, null, null, null, null, null);
            while(cursor.moveToNext()){
                String name=cursor.getString(cursor.getColumnIndex("name"));
                System.out.println(name);
            }
        }
    }

    // 删除数据单击事件
    class DeleteListener implements OnClickListener {
        @Override
        public void onClick(View v) {
            System.out.println("delete a data");
            DatabaseHelper dbHelper = new DatabaseHelper(
                    SQLiteOperationActivity.this, "sqlite_test_db");
            SQLiteDatabase sqlDb = dbHelper.getWritableDatabase();
            sqlDb.delete("users", "id=?", new String[]{"1"});
        }
    }
    
    //删除表
    class DropTableListener implements OnClickListener{

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            System.out.println("drop a table");
            DatabaseHelper dbHelper = new DatabaseHelper(
                    SQLiteOperationActivity.this, "sqlite_test_db");
            SQLiteDatabase sqlDb = dbHelper.getWritableDatabase();
            sqlDb.execSQL("drop table users");
        }
        
    }
}