android轻量级数据库SQlite的工具类

package com.android.mtov.Util;

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

import com.android.mtov.Bean.PlanBean;

import java.util.ArrayList;

/**
* Created by sf on 2017/11/7.
*/

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() + "/mtov.db";
db = SQLiteDatabase.openOrCreateDatabase(path, null);
String sql = "create table if not exists mtov" +
"(id integer primary key autoincrement," +
"name text(50),mon text(50),address text(50),number text(50))";
db.execSQL(sql);//创建表
}

/**
* 查询数据
* 返回List
*/
public ArrayList<PlanBean> selectis() {
ArrayList<PlanBean> list = new ArrayList<PlanBean>();
Cursor cursor = db.query("mtov", null, null, null, null, null, null);
while (cursor.moveToNext()) {
int id = cursor.getInt(cursor.getColumnIndex("id"));
String name = cursor.getString(cursor.getColumnIndex("name"));
String mon = cursor.getString(cursor.getColumnIndex("mon"));
String address = cursor.getString(cursor.getColumnIndex("address"));
String number = cursor.getString(cursor.getColumnIndex("number"));
list.add(new PlanBean(id, name, mon, address, number));
Log.e("--Main--", "selectis=========" + id + "==" + name + "==" + mon + "==" + address + "==" + number);
}
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("mtov", "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("mtov", 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(String name, String mon, String address, String number) {
ContentValues contentValues = new ContentValues();
contentValues.put("name", name);
contentValues.put("mon", mon);
contentValues.put("address", address);
contentValues.put("number", number);
long dataSize = db.insert("mtov", null, contentValues);
Log.e("--Main--", "insertData====" + name + "==" + mon + "==" + address + "==" + number);
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("mtov", null, "name = ?", new String[]{names}, null, null, null);
while (cursor.moveToNext()) {
return true;
}
return false;
}
}