ADO.NET获取数据(DataSet)同时获取表的架构实例

普通的ADO.NET获取DataSet的写法如下：

using System.Configuration;
using System.Data;
using System.Data.SqlClient;
public class SQLHelper
{
 private static readonly string ConnectionString = ConfigurationManager.ConnectionStrings["Default"].ConnectionString;
 public static DataSet GetDataSet(string sql)
 {
 using (SqlConnection conn =new SqlConnection(ConnectionString))
 {
 SqlCommand cmd = new SqlCommand(sql, conn);
 SqlDataAdapter adapter = new SqlDataAdapter(cmd);
 DataSet ds = new DataSet();
 conn.Open();
 adapter.Fill(ds);
 return ds;
 }
 }
}

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
 <connectionStrings>
 <add name="Default" connectionString="Data Source=.;Initial Catalog=EFDb;Integrated Security=true"/>
 </connectionStrings>
</configuration>

这里需要获取DataTable的主键信息，调试时发现没有主键信息，而实际数据库中是有主键（Id）

此时需要给SqlDataAdapter设置属性MissingSchemaAction为System.Data.MissingSchemaAction.AddWithKey

修改后的SQLHelper为

using System.Configuration;
using System.Data;
using System.Data.SqlClient;
public class SQLHelper
{
 private static readonly string ConnectionString = ConfigurationManager.ConnectionStrings["Default"].ConnectionString;
 public static DataSet GetDataSet(string sql)
 {
 using (SqlConnection conn =new SqlConnection(ConnectionString))
 {
 SqlCommand cmd = new SqlCommand(sql, conn);
 SqlDataAdapter adapter = new SqlDataAdapter(cmd);
 adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
 DataSet ds = new DataSet();
 conn.Open();
 adapter.Fill(ds);
 return ds;
 }
 }
}

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