Android SQLiteHelper类

package com.w3cnet.db;

import android.content.Context;
import android.content.ContentValues;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.Cursor;

public class SqliteHelper extends SQLiteOpenHelper{
private final static String DATABASE_NAME = "db_name";
private final static int DATABASE_VERSION = 1;
private final static String TABLE_NAME = "mytable";
private final static String FIELD_ID = "ID";
private final static String FIELD_NAME = "NAME";

public SqliteHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {
String sql = "Create table %s (%s integer primary key autoincrement,%s text);";
sql = String.format(sql, TABLE_NAME, FIELD_ID, FIELD_NAME);
db.execSQL(sql);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
String sql = "DROP TABLE IF EXISTS " + TABLE_NAME;
db.execSQL(sql);
onCreate(db);
}

public Cursor select() {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_NAME, null, null, null, null, null,
FIELD_ID);
return cursor;

}

public long insert(String name) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(FIELD_NAME, name);
long row = db.insert(TABLE_NAME, null, cv);
return row;
}

public void delete(int id){
SQLiteDatabase db = this.getWritableDatabase();
String where = FIELD_ID + "= ?";
String[] wherevalue = {Integer.toString(id)};
db.delete(TABLE_NAME, where, wherevalue);
}

public void update(int id,String name)
{
SQLiteDatabase db = this.getWritableDatabase();
String where = FIELD_ID + "= ?";
String[] wherevalue = {Integer.toString(id)};
ContentValues cv = new ContentValues();
cv.put(FIELD_NAME, name);
db.update(TABLE_NAME, cv, where, wherevalue);
}
}