[转]Android 如何对sqlite数据库进行增删改[insert、update和delete] 操作

import android.content.ContentValues;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteDatabase.CursorFactory;

import android.database.sqlite.SQLiteOpenHelper;

import android.util.Log;

public class DBHelper extends SQLiteOpenHelper {

    final private static String mDbName="imgfornote";

    final private static int mDbVersion=1;

    private static DBHelper mInstance=null;

    private final static String mTUserPhoto="UserPhoto";

    final private static String mCreateSqlForNoteClass="create table if not exists NoteClass(classId integer primary key asc autoincrement,className NVARCHAR(100),rowTime timestamp default (datetime('now', 'localtime')))";

    final private static String mCreateSqlForUserPhoto="create table if not exists UserPhoto(photoId integer primary key asc autoincrement,photoName VARCHAR(200),userPt VARCHAR(200),title VARCHAR(255),classId integer,content NVARCHAR(250),tag NVARCHAR(200),remark text,status integer default 0,rowTime timestamp default (datetime('now', 'localtime')))";

    final private static String[] mInsertSqlForNoteClass={"insert into NoteClass(className) values('默认分类[私有]');","insert into NoteClass(className) values('读书笔记[私有]');","insert into NoteClass(className) values('电子资料[公开]');"};

    private DBHelper(Context context, CursorFactory factory) {

        super(context, mDbName, factory, mDbVersion);

    }

    public static DBHelper GetInstance(Context context, SQLiteDatabase.CursorFactory factory)

    {

        if(mInstance==null){

            mInstance = new DBHelper(context,factory);

        }

        return mInstance;

    }

    @Override

    public void onCreate(SQLiteDatabase db) {

        // 创建表

        db.execSQL(mCreateSqlForNoteClass);

        db.execSQL(mCreateSqlForUserPhoto);

        //初始化数据

        for(int i=0;i<mInsertSqlForNoteClass.length;i++)

            db.execSQL(mInsertSqlForNoteClass[i]);

    }

    @Override

    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        // TODO Auto-generated method stub

    }

    private Cursor ExecSQLForCursor(String sql, String[] selectionArgs){

        SQLiteDatabase db =getWritableDatabase();

        Log.i("ExecSQLForCursor",sql);

        return db.rawQuery(sql, selectionArgs);

    }

    private void ExecSQL(String sql){

        try{

            SQLiteDatabase db =getWritableDatabase();

            ExecSQL(sql,db);

        }catch(Exception e){

            Log.e("ExecSQL Exception",e.getMessage());

                    e.printStackTrace();

        }

    }

    private void ExecSQL(String sql,SQLiteDatabase db ){

    try{

            db.execSQL(sql);

            Log.i("ExecSQL",sql);

        }catch(Exception e){

            Log.e("ExecSQL Exception",e.getMessage());

                e.printStackTrace();

        }

    }

    //添加照片信息

    public long InsertUserPhoto(String photoName,String title){

        SQLiteDatabase db =getWritableDatabase();

        ContentValues cv = new ContentValues();

        cv.put("photoName", photoName);

        cv.put("title", title);

        return db.insert(mTUserPhoto, null, cv);

    }

    //查询照片信息

    public Cursor SearchPhoto(int row,String sort){

        Cursor cur = null;

        try{

            String ord = (sort==null|| sort.toLowerCase().startsWith("a"))?"asc":"desc";

            String sql = "select * from UserPhoto order by photoId "+ord;

            String[] args = {String.valueOf(row)};

            if(row>0){

                sql +=" limit ?";

            }else{

                args=null;

            }

            cur = ExecSQLForCursor(sql,args);

        }catch (Exception e) {

            cur = null;

            Log.e("SearchPhoto Exception",e.getMessage());

            e.printStackTrace();

        }

        return cur;

    }

    //修改照片信息

    public int UpdateUserPhoto(int photoId,int classId,String title,String content, String tag){

        SQLiteDatabase db =getWritableDatabase();

        ContentValues cv = new ContentValues();

        cv.put("classId", classId);

        cv.put("title", title);

        cv.put("content", content);

        cv.put("tag", tag);

        String[] args = {String.valueOf(photoId)};

        return db.update(mTUserPhoto, cv, "photoId=?",args);

    }

    //删除照片信息

    public int DeleteUserPhoto(int photoId){

        SQLiteDatabase db =getWritableDatabase();

        String[] args = {String.valueOf(photoId)};

        return db.delete(mTUserPhoto, "photoId=?", args);

    }

}