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  • C# ADO.NET操作数据库 SqlHelp.cs类

    刚开始练习ADONET的时候,练习的一个SQLHelp.cs  数据库操作类,很简单,但是也很实用

    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 ADONET
    {
        class SqlHelper
        {
            private static string connStr = ConfigurationManager.ConnectionStrings["dbConnStr"].ConnectionString;
    
            public static int ExecuteNonQuery(string sql,SqlParameter[] parameters)
            { 
                using(SqlConnection conn = new SqlConnection(connStr))
                {
                    conn.Open();
                    using(SqlCommand cmd = conn.CreateCommand())
                    {
                        cmd.CommandText = sql;
                        //foreach (SqlParameter parm in parameters)
                        //{
                        //    cmd.Parameters.Add(parm);
                        //}
                        cmd.Parameters.AddRange(parameters);
                        return cmd.ExecuteNonQuery();
                    }
                }
            }
    
            public static object ExecuteScalar(string sql, SqlParameter[] parameters)
            {
                using (SqlConnection conn = new SqlConnection(connStr))
                {
                    conn.Open();
                    using (SqlCommand cmd = conn.CreateCommand())
                    {
                        cmd.CommandText = sql;
                        cmd.Parameters.AddRange(parameters);
                        return cmd.ExecuteScalar();
                    }
                    
                }
            }
    
            public static DataTable ExecuteDataSet(string sql, SqlParameter[] parameters)
            {
                using (SqlConnection conn = new SqlConnection(connStr))
                {
                    conn.Open();
                    using (SqlCommand cmd = conn.CreateCommand())
                    {
                        cmd.CommandText = sql;
                        cmd.Parameters.AddRange(parameters);
                        SqlDataAdapter adapter = new SqlDataAdapter();
                        DataSet dataset = new DataSet();
                        adapter.Fill(dataset);
                        return dataset.Tables[0];
                    }
    
                }
                
            }
        }
    }
    

      

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  • 原文地址:https://www.cnblogs.com/lastcode/p/4856457.html
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