20160229 ADO.NET连接SQL Server数据库(SqlHelper类)


一、首先需要在App.config文件中添加如下红色文字

< ? xml version = "1.0" encoding = "utf-8" ? >
<configuration>
<connectionStrings>
<add name = "dbConnStr" connectionString = "Data Source=.; Initial Catalog=MyTest;User ID=;Password=" / >
< / connectionStrings>
< / configuration>
如果是免费版的SQL Server，那么Data Source=10.205.1.16\sqlexpress（付费版的只需要填写IP地址即可）；

访问本地只需要一个.就OK了；

二、添加System.Configuration引用

添加using System.Configuration;名称空间

三、SqlHelper代码

class SqlHelper
{
private static string connStr = ConfigurationManager.ConnectionStrings["dbConnStr"].ConnectionString;

public static int ExecuteNonQuery(string sql, params SqlParameter[] parameters)
{
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = sql;
cmd.Parameters.AddRange(parameters);
return cmd.ExecuteNonQuery();
}
}
}

public static object ExecuteScalar(string sql, params 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 ExecuteDataTable(string sql, params 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(cmd);
DataSet dataset = new DataSet();
adapter.Fill(dataset);
return dataset.Tables[0];
}
}
}
}