SQLite Database判断是否存在、新建、删除.....

　Android SQLite Database本打算封装SQLite的，但是，发现实际上Android已经封装了一层，尤其是数据的增、删、查、改上，更是如此，所以，我后来只封装了一个连接层，负责打开、建立数据库，并返回一个SQLite的实例用来完成增、删、插、改等操作。
//----------- DBHelper -------------
package utility.db;
import java.io.FileNotFoundException;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
public class DBHelper
{
private SQLiteDatabase db = null;
private Context ctx = null;
public DBHelper( Context ctx )
{
this.ctx = ctx;
}
/**
* 判断数据库是否存在
*
* @param dbName
* 数据库名称
* @return true存在 false不存在
*/
public boolean exist( String dbName )
{
Log.log("called fun : exist()");
boolean flag = false;
try
{
db = ctx.openDatabase(dbName, null);
Log.log("database/"+dbName+" exist");
flag = true;
}
catch (FileNotFoundException e)
{
flag = false;
Log.log("database/"+dbName+" not exist");
}
finally
{
if (db != null)
db.close();
db = null;
}
return flag;
}
/**
* 打开数据库
*
* @param dbName
* 数据库名称
* @return true 打开成功 false打开失败
*/
public boolean openDatabase( String dbName , boolean created )
{
return openDatabase(dbName, null, created);
}
/**
* 打开数据库
*
* @param dbName
* 数据库名称
* @param factory
* @return true 打开成功 false打开失败
*/
public boolean openDatabase( String dbName , CursorFactory factory ,
boolean created )
{
Log.log("called fun : openDatabase()");
Log.log("called fun : if not exist then created "+dbName+" ? : "+created);
boolean flag = false;
if(exist(dbName))
{
try
{
db = ctx.openDatabase(dbName, factory);
Log.log("database/"+dbName+" is opened");
flag = true;
}
catch (FileNotFoundException e)
{
Log.log("database/"+dbName+" is not opened");
flag = false;
}
}
else
{
if(created)
{
flag = createDatabase(dbName, 1, 0, factory);
}
else
{
flag = false;
}
}
return flag;
}