android 本地数据库sqlite的封装

时间：2014-05-21 17:48:31 收藏：0 阅读：329

单机android sqlite数据库的实现，这个数据库可与程序一起生成在安装包中

一、下载sqlite3.exe文件

二、运行 cmd 转到sqlite3.exe 所在目录运行 sqlite3.exe 数据库名.db

然后会出现sqlite>的命令提示符

输入创建表的语句， create table 表名（‘列’，‘列’。。。）；（注意：要在结束部分加分号）

此时会在sqlite3.exe 所在目录，出现所建数据库的文件

三、如果想在Android中运行的话，需要在数据库中增添

 CREATE TABLE "android_metadata" ("locale" TEXT DEFAULT ‘zh_CN‘)

INSERT INTO "android_metadata" VALUES (‘zh_CN‘)

四、将数据库 复制到 Android项目中res/raw中

五、下面是代码：

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public class TestSqlDatabase{
     
    private 
static final String DATABASE_PATH = "/data/data/your.package.name/databases";     //此处不要改动，这个为数据库在手机上的物理地址
    private 
static final int DATABASE_VERSION = 0;
    private 
static final String DATABASE_NAME = "test.db";  //此处为数据库名称
     
    private 
static String outFileName = DATABASE_PATH + "/" 
+ DATABASE_NAME;
     
    private 
Context context;
　　　　 private 
SQLiteDatabase database;
     
    public 
TestSqlDatabase(Context context) {
        this.context = context;
         
        File file = new 
File(outFileName);
        if 
(file.exists()) {
            database = SQLiteDatabase.openOrCreateDatabase(outFileName, null);
            if 
(database.getVersion() != DATABASE_VERSION) {
                database.close();
                file.delete();  
            }
        }
        try 
{
            buildDatabase();
        } catch 
(Exception e) {
            e.printStackTrace();
        }
         
    }
    private 
void buildDatabase() throws 
Exception{
        InputStream myInput = context.getResources().openRawResource(R.raw.test);
        File file = new 
File(outFileName);
         
        File dir = new 
File(DATABASE_PATH);
        if 
(!dir.exists()) {
            if 
(!dir.mkdir()) {
                throw 
new Exception("创建失败");
            }
        }
         
        if 
(!file.exists()) {           
            try 
{
                OutputStream myOutput = new 
FileOutputStream(outFileName);
                 
                byte[] buffer = new 
byte[1024];
                int 
length;
                while 
((length = myInput.read(buffer))>0){
                    myOutput.write(buffer, 0, length);
                }
                myOutput.close();
                myInput.close();
            } catch 
(Exception e) {
                e.printStackTrace();
            }
         
        }
    }
 
/**
 * 查找
 * @return
 */
public 
Cursor select() {
     database = SQLiteDatabase.openOrCreateDatabase(outFileName, null);
     String sql = "select * from note_table";
         
     Cursor cursor = database.rawQuery(sql, null);
     return 
cursor;
}
/**
 * 插入
 * @param word
 * @param note
 * @return
 */
public 
long insert(String word, String note) {
      database = SQLiteDatabase.openOrCreateDatabase(outFileName, null);
      ContentValues cv = new 
ContentValues();
      cv.put("word", word);
      cv.put("note", note);
             
      long 
result = database.insert("note_table", null, cv);    
      return 
result;
}
  
  
 
/**
 * 更新
 * @param word
 * @param note
 * @return
     */
    private 
int update(String word, String note) {                            //参数 word 为修改条件   note为修改内容
        database = SQLiteDatabase.openOrCreateDatabase(outFileName, null);
         
        ContentValues cv = new 
ContentValues();
        cv.put("note", note);
         
        int 
result = database.update("note_table", cv, "word=?", new 
String[]{word});     
         
        return 
result;
    }
  
 
/**
 * 删除
 * @param word
 */
public 
int deleteNote(String word) {
      database = SQLiteDatabase.openOrCreateDatabase(outFileName, null);
      int 
result = database.delete("note_table", "word=?", new 
String[]{word});
      return 
result;
}
  
     
public 
void close() {
      database.close();
}
 
 
}

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