Android实用的SQLite数据库工具类

每天一个小目标,早晚单车变摩托

package com.example.bookadmin.sqlite;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

import com.example.bookadmin.bean.SongBean;
import com.example.bookadmin.tools.utils.LogUtils;

import java.util.ArrayList;

/**
* Created by Administrator on 2017/10/19.
* by:TaoHui
*/

public class DBUtils {
private static DBUtils dbUtils;
private SQLiteDatabase db;
/**
* 单例模式
* @return
*/
public static DBUtils getInstance(){
if(dbUtils == null){
dbUtils = new DBUtils();
return dbUtils;
}
return dbUtils;
}
/**
* 创建数据表
* @param contenxt 上下文对象
*/
public void creads(Context contenxt){
String path = contenxt.getCacheDir().getPath()+"/muisd.db";
db = SQLiteDatabase.openOrCreateDatabase(path,null);
String sql = "create table if not exists t_person" +
"(id integer primary key autoincrement," +
"bsid int(50) ,name text(50))";
db.execSQL(sql);//创建表
}
/**
* 查询数据
* 返回List
*/
public ArrayList<SongBean> selectis() {
ArrayList<SongBean> list = new ArrayList<>();
Cursor cursor = db.query("t_person",null,null,null,null,null,null);
while (cursor.moveToNext()){
SongBean userBean = new SongBean();
int id = cursor.getInt(cursor.getColumnIndex("id"));
String name = cursor.getString(cursor.getColumnIndex("name"));
int bsid = cursor.getInt(cursor.getColumnIndex("bsid"));
userBean.setName(name);
userBean.setBsid(bsid);
userBean.setId(id);
list.add(userBean);
Log.e("--Main--", "==============selectis======"+id+"================"+name+"================"+bsid);
}
if(cursor != null){
cursor.close();
}

return list;
}
/**
* 根据ID删除数据
* id 删除id
*/
public int delData(int id){
int inde = db.delete("t_person","id = ?",new String[]{String.valueOf(id)});
Log.e("--Main--", "==============删除了======================"+inde );
return inde;
}
/**
* 根据ID修改数据
* id 修改条码的id
* bsid 修改的ID
* name 修改的数据库
*/
public int modifyData(int id,int bsid, String name){
ContentValues contentValues = new ContentValues();
contentValues.put("name",name);
contentValues.put("bsid",id);
int index = db.update("t_person",contentValues,"id = ?",new String[]{String.valueOf(id)});
Log.e("--Main--", "==============修改了======================"+index );
return index;
}
/**
* 添加数据
* bsid 添加的数据ID
* name 添加数据名称
*/
public long insertData(int bsid, String name){
ContentValues contentValues = new ContentValues();
contentValues.put("name",name);
contentValues.put("bsid",bsid);
long dataSize = db.insert("t_person",null,contentValues);
Log.e("--Main--", "==============insertData======================"+name+"================"+bsid);
return dataSize;
}
/**
* 查询名字单个数据
* @param names
* @return
*/
public boolean selectisData(String names){
//查询数据库
Cursor cursor = db.query("t_person",null,"name = ?",new String[]{names},null,null,null);
while (cursor.moveToNext()){
return true;
}
return false;
}
}