ADO.NET获取数据(DataSet)同时获取表的架构实例

2020-01-17 22:15:07

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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;  } }}