<span style="font-family:Microsoft YaHei;font-size:18px;">將資料庫中的增刪改查操作封裝成一個類，使用時直接呼叫很方便

package com.qianfeng.day14_sqliteopenhelper2.db;

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

public class DbManage {
	
	private MySqliteHelper helper;
	
	public DbManage(MySqliteHelper helper){
		this.helper = helper;
	}
	
	/**
	 * 增  刪   改
	 * @param sql
	 */
	public void changeData(String sql){
		SQLiteDatabase db = helper.getReadableDatabase();
		db.execSQL(sql);
		db.close();
	}
	
	/**
	 * 查
	 * @param sql
	 * @param selectionArgs
	 * @return
	 */
	public  Cursor queryData(String sql, String[] selectionArgs){
		
		SQLiteDatabase db = helper.getReadableDatabase();
		Cursor cursor = db.rawQuery(sql, selectionArgs);
		return cursor;
		
	}
	
	/**
	 * api  插入
	 */
	public long ApiInSertData(String table, ContentValues values){
		SQLiteDatabase db = helper.getReadableDatabase();
		long l = db.insert(table, null, values);
		return l;
	}
	/**
	 * api  修改
	 */
	public int ApiUpdataData(String table, ContentValues values, String whereClause, String[] whereArgs){
		SQLiteDatabase db = helper.getReadableDatabase();
		int l = db.update(table, values, whereClause, whereArgs);
		return l;
	}
	/**
	 * api  刪除
	 */
	public int ApiDeleteData(String table, String whereClause, String[] whereArgs){
		SQLiteDatabase db = helper.getReadableDatabase();
		int l = db.delete(table, whereClause, whereArgs);
		return l;
	}
	/**
	 * api  查詢
	 */
	public Cursor ApiQueryData(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy){
		SQLiteDatabase db = helper.getReadableDatabase();
		Cursor cursor = db.query(table, columns, selection, selectionArgs, groupBy, having, orderBy);
		return cursor;
	}
	
	
	
	
	

}









</span>