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自用SqlHelper.cs类，此类来自软谋教育徐老师课程SqlHelper.cs！ 1using System;2using System.Collections;3using System.Collections.Generic;4using System.Configuration;5using System.Data;6using System.Data.SqlClient;7using System.Linq;8using System.Web;9 10namespace PROJECT2016071211{12/// 此类为抽象类，13/// 不允许实例化，在应用时直接调用即可14///</summary> 15publicabstractclass SqlHelper16 {17///...
在项目中添加一个自定义的SqlHelper类，用于简化连接数据库的代码：分别是： ExecuteNonQuery（）； ExecuteScalar（）； ExecuteDataTables();以下有三个版本：第三个版本比较好 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Configuration; using System.Data.SqlClient; using System.Data;namespace ADONET2 {class SqlHelper{private static string connSt...
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.OracleClient; using System.Configuration; using System.Data; using System.Reflection; using System.Web.Script.Serialization;namespace DAL {publicclass OracleHelper{#region 变量///<summary>/// 数据库连接对象///</summary>privatestatic OracleConnection _con = null;publicstaticstring constr = Config...
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Configuration;using System.Data;using System.Data.SqlClient;namespace 登录.DAL{ public static class SqlHelper { private static readonly string conStr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString; //执行增删改的 public static ...
1#region 私有构造函数和方法2 3private SqlHelper() { }4 5///<summary> 6/// 将SqlParameter参数数组(参数值)分配给SqlCommand命令. 7/// 这个方法将给任何一个参数分配DBNull.Value; 8/// 该操作将阻止默认值的使用. 9///</summary> 10///<param name="command">命令名</param> 11///<param name="commandParameters">SqlParameters数组</param> 12privatestaticvoid AttachParameters(SqlCommand command, SqlParamet...
老师在讲C#实战项目时所使用的SqlHelper，使用的数据库时SQL Server注意，连接数据库的连接字符串需要在配置文件中设置好<appSettings><add key = "connString" value="data source = .; database = CourseSelectionInfo; integrated security = true"/> </appSettings>public class SqLHelper {#region 连接字符串connStringprivate static string connString;static DBHelper(){connString = ConfigurationManager.AppSettings["...
1 <?php 2class SqlHelper{3private$conn;4privatestatic$host="localhost";5privatestatic$user="root";6privatestatic$password="";7privatestatic$db="emp";8//构造函数 完成初始化的任务 9publicfunction __construct(){10$this->conn= new mysqli(self::$host,self::$user,self::$password,self::$db);11if ($this->conn->connect_error){12die("连接失败".$this->conn->connect_error);13 14 }15$this->conn->q...
<add name="ConnStr" connectionString="Data Source=.;Initial Catalog=test;User ID=sa;Password=123456"/> using System; using System.Configuration; using System.Data; using System.Data.SqlClient; using System.Collections;namespace MyTest.common {public abstract class SqlHelper{public static readonly string ConnStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;private static Has...
在AppConfig.cs增加DataSouce连接字符串（SQL Server）： <connectionStrings><add name="sql" connectionString="server=127.0.0.1;database=Test;uid=root;pwd=root;"/></connectionStrings>SqlHelper类： using实质：在程序编译阶段，编译器会自动将using语句生成为try-finally语句，并在finally块中调用对象的Dispose方法，来清理资源。所以，using语句等效于try-finally语句。 using (Font f2 = new Font("Arial", 10, FontS...
using System; using System.Collections.Generic; using System.Configuration; using System.Data; using System.Data.SqlClient; using System.Linq; using System.Text; using System.Threading.Tasks;namespace CarHailing.Base {/// <summary>/// 数据库帮助类/// </summary>public class SqlHelp{/// <summary>/// 创建一个已打开的连接/// </summary>/// <returns></returns>private static SqlConnection CreateConn(){S...