android sqlite数据库操作 增、删、改、查询 已实现 【附源码】

【实例简介】实现了基本的 增删改查功能，并包含了基本的sqlite操作类
【实例截图】

【核心代码】

package com.test;

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

public class ToDoDB extends SQLiteOpenHelper {
	
	private final static String DATABASE_NAME = "todo_db";
	private final static int DATABASE_VERSION = 1;
	private final static String TABLE_NAME = "todo_table";
	public final static String FIELD_id = "_id";
	public final static String FIELD_TEXT = "todo_text";

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

	public void onCreate(SQLiteDatabase db) {

		String sql = "CREATE TABLE "   TABLE_NAME   " ("   FIELD_id
				  " INTEGER primary key autoincrement, "   " "   FIELD_TEXT
				  " text)";
		db.execSQL(sql);
	}

	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, null);
		return cursor;
	}

	public long insert(String text) {
		SQLiteDatabase db = this.getWritableDatabase();
		ContentValues cv = new ContentValues();
		cv.put(FIELD_TEXT, text);
		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 text) {
		SQLiteDatabase db = this.getWritableDatabase();
		String where = FIELD_id   " = ?";
		String[] whereValue = { Integer.toString(id) };
		ContentValues cv = new ContentValues();
		cv.put(FIELD_TEXT, text);
		db.update(TABLE_NAME, cv, where, whereValue);
	}
}