php_DBHelper 包含【CURD】 demo <?...php class DBHelper{ private $host="localhost"; private $userName="root"; private $pwd="root"; private...mysqli_affected_rows($conn); mysqli_close($conn); return $rows;//别忘记$符号 } } #开始执行测试 $db=new DBHelper
C#的DBHelper,方便大家复制直接用,改一下数据库就行了。...目录 环境: DBHelper: 数据库: 测试: ---- 环境: 系统:win10 工具:Visual Studio 2019 数据库:sqlserver DBHelper: using...System.Threading.Tasks; using System.Data; using System.Data.SqlClient; namespace CShapDBHelper { public class DBHelper...; int rows = DBHelper.ExecuteNonQuery(addSql); Console.WriteLine(rows>0?"...sql += string.Format(" where id='{0}'",id); } DataTable dt = DBHelper.Query
using System.Data; using System.Data.Common; using System.Configuration; public class DbHelper...() { this.connection = CreateConnection(DbHelper.dbConnectionString); } public DbHelper...下面我给出一些基本的使用示例,基本能满足你大部分的数据库操作需要了. 1)直接执行sql语句 DbHelper db = new DbHelper();...db = new DbHelper(); DbCommand cmd = db.GetSqlStringCommond("select * from t1"); DataSet...ds = db.ExecuteDataSet(cmd); 4)返回DataTable DbHelper db = new DbHelper();
可以参考的:http://www.oschina.net/code/snippet_4946_748
猿创征文|C#基础——DBHelper 前言 本节内容为方便大家复制,所有内容都写在了引用模块。...DBHelper源码 using System; using System.Collections.Generic; using System.Linq; using System.Text;...System.Threading.Tasks; using System.Data; using System.Data.SqlClient; namespace CShapDBHelper { public class DBHelper
直接上代码: /** * Created by chaozhou on 2015/9/18. */ var mssql = require('mssql')...
DbHelper,这个在开发者社区中一直备受瞩目的名字,如今依然熠熠生辉。最近,一位技术大佬再次展示了DbHelper的强大魅力,让我们一起来欣赏一下吧!...blog.csdn.net/ftfmatlab/article/details/135655836 源码地址:https://download.csdn.net/download/ftfmatlab/88765289 DbHelper...的封装:简约而不简单 基于ADO.NET框架,这位大佬巧妙地封装了适用于多个关系型数据库的DbHelper。...public class DbHelper { private readonly DataBase _dataBase; public DbHelper(DataBase...2024/01/20新增多个参数生成 为了满足更多场景下的需求,大佬在近期对DbHelper进行了升级。新增的多个参数生成功能无疑将为开发者们带来更多便利。让我们一起来看看这个新特性吧!
Python基础——Visual Studio版本——DBHelper-MySQL版本 前言 本节内容为方便大家复制,所有内容都写在了引用模块。...repo.huaweicloud.com/repository/pypi/simple pip3 config list pip3 install --upgrade pip pip3 install pymysql DBHelper...源码 import pymysql class DBHelper(): def __init__(self): # 数据库连接参数 self.host... cursor.execute(sql) self.conn.commit() self.conn.close() 调用示例: from DBHelper...import DBHelper db=DBHelper() db.excute("sql") result=db.query("sql") print(result) 希望对大家有所帮助
; 数据中查出数据绑定到DataGridView控件中(Load事件,查询,给下拉框赋值) //定义SQL语句 string sql1 = "select * from RoomType"; //调用DBHelper...类的查询方法,返回DataTable类型数据 DataTable dt = DBHelper.getDataTable(sql1); // DisplayMember为显示的文本值,ValueMember...=””){ sql +=” and dateValue = '”+ dateValue +” '” ; } //调用DBHelper类的查询方法,返回DataTable类型数据 DataTable...类增删改方法 int result = DBHelper.Zsg(sql); //判断执行结果 if (result > 0) { MessageBox.Show("删除成功!")...; //这个是刷新DataGridView列表 string sql1 = "select * from RoomType"; DataTable dt = DBHelper.getDataTable
IDbHelper dbHelper = new OracleHelper(ConfigHelper.GetConfigString("BusinessDbConnection"));...(); //主表 TE_AREAManager manager = new TE_AREAManager(dbHelper,...userInfo); TE_AREAEntity tE_AREAEntity = manager.GetObject(dbHelper.SqlSafe...(); result=false; } 可以传入sql语句执行事务 IDbHelper dbHelper = new...= " DELETE FROM TE_AREA_SUB WHERE ID=" + dbHelper.SqlSafe(id); dbHelper.ExecuteNonQuery
= new SqlHelper(); dbhelper.QueryData("Select * from TableA"); Console.ReadKey...假如第三方的DBHelper结构如下: /// /// 第三方的新dbHelper,实际场景中,这个类通常都是封装在程序集中以dll提供,客户端程序无法修改 /// </summary... _dbHelper; public DBHelperAdapter(DbHelper dbHelper) { this...._dbHelper = dbHelper; } public DataSet QueryData(string sql) { return _dbHelper.SelectData...(sql); } } 这样原有的客户端程序,只需要把 IDBHelper dbhelper = new SqlHelper(); 改成: IDBHelper dbhelper
为了提高代码的可维护性和复用性,封装一个通用的数据库操作助手类(DBHelper)是非常有必要的。本文将详细介绍如何创建和使用一个DBHelper类来简化数据库操作。...二、DBHelper类的设计DBHelper类的核心目标是封装常用的数据库操作,如执行查询、执行命令、获取数据集等。...DBHelper工具类示例代码如下:namespace Test{ public static class DBHelper { // 请根据实际情况设置数据库连接字符串...通过DBHelper类的GetScalar方法,我们可以轻松实现这一需求。...四、DBHelper类的优势使用DBHelper类有以下几个显著优势:优势 描述
); 66 if (DBHelper.connection.State!...= ConnectionState.Open) 67 { 68 DBHelper.connection.Open();//打开数据库连接...); 109 //打开数据库连接 110 DBHelper.connection.Open(); 111...); 375 if (DBHelper.connection.State !...= ConnectionState.Open) 376 { 377 DBHelper.connection.Open(); 378
DBHelper public class DBHelper extends SQLiteOpenHelper { public static final String TAG = "...DBHelper"; private static final String NAME = "test.db"; private static final int VERSION...= 1; private static DBHelper dbHelpter; public static DBHelper getDbHelpter(Context context...dbHelpter; } private DBHelper(Context context) { super(context, NAME, null, VERSION...helpter = DBHelper.getDbHelpter(dbContext); SQLiteDatabase db = helpter.getWritableDatabase();
DBHelper public class DBHelper extends SQLiteOpenHelper { public static final String TAG = "DBHelper...dbHelpter; public static DBHelper getDbHelpter(Context context){ if (dbHelpter == null)...{ dbHelpter = new DBHelper(context); } return dbHelpter; } private...DBHelper(Context context) { super(context, NAME, null, VERSION); } @Override public...helpter = DBHelper.getDbHelpter(dbContext); SQLiteDatabase db = helpter.getWritableDatabase();
: DbContext { public DbHelper() : base("strConn") { //自动创建表...,如果Entity有改到就更新到表结构 Database.SetInitializer(new MigrateDatabaseToLatestVersion()); } public DbSet Students {...set; } } internal sealed class ReportingDbMigrationsConfiguration : DbMigrationsConfiguration<DbHelper...db = new DbHelper()) { stu=db.Students.Where(it => it.Num == id)
SQLiteDatabase对象可以使用SQLiteOpenHelper或者使用静态方法获取(具体内容可以参考开发手册) //使用SQLiteOpenHelper可以获取 DatabaseHelper dbHelper...= new DatabaseHelper(Sqlite.this, “sqlite_joyous_db”); SQLiteDatabase db = dbHelper.getReadableDatabase...= new DatabaseHelper(Sqlite.this, “sqlite_joyous_db”); SQLiteDatabase db = dbHelper.getReadableDatabase..., new String[] { “1” }); 删除 DatabaseHelper dbHelper = new DatabaseHelper(Sqlite.this, “sqlite_joyous_db...”); SQLiteDatabase db = dbHelper.getReadableDatabase(); db.delete(“user”, “id=?”
); 60 DBHelper.connection.Open(); 61 int result = command.ExecuteNonQuery...); 52 DBHelper.connection.Open(); 53 int result = command.ExecuteNonQuery...); 238 DBHelper.connection.Open(); 239 SqlDataReader sdr = command.ExecuteReader...); 304 DBHelper.connection.Open(); 305 SqlDataReader sdr = command.ExecuteReader...); 109 DBHelper.connection.Open(); 110 int result = command.ExecuteNonQuery
Server)的类型,都分别继承自DbConnection,DbCommand,DbDataAdapter, 因此,我们可以使用DbProviderFactory来创建我们想要的、可实现任何数据库的DbHelper...二、实现基本的DbHelper帮助类 1、我们将DbHelper定义为抽象类,并在类中提供一个抽象可读属性,名称叫DbProviderFactory,返回类型为DbProviderFactory(注:名称与返回类型可以为一样...} } 3、我们为该抽象类编写一个构造函数,传进去的参数为连接字符串,并将其存储在可读的ConnectionString字段里,代码如下: public abstract class DbHelper...编写一些用于实现数据库相关操作的方法,这里就用到了DbProviderFactory类中的方法,以下方法仅供参考,具体请参照其他完整的DbHelp帮助类, DbHelper完整代码如下: //帮助类的基类...(抽象类) public abstract class DbHelper { public DbHelper(string connectionString)
dbHelper; // Uri工具类 private static final UriMatcher sUriMatcher; // 查询、更新条件...= new DBHelper(getContext()); return true; } // 添加方法 public Uri insert(Uri...uri, ContentValues values) { // 获得数据库实例 SQLiteDatabase db = dbHelper.getWritableDatabase...(); // 插入数据,返回行ID long rowId = db.insert(DBHelper.EMPLOYEES_TABLE_NAME, Employee.NAME...表名称常量 public static final String EMPLOYEES_TABLE_NAME = "employee"; // 构造方法 public DBHelper
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