ADO.NET获取数据数据(DataSet)同时获取表的架构
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2024-01-13 22:21:04
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 ......
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; } } }View Code
<?xml version="1.0" encoding="utf-8" ?> <configuration> <connectionStrings> <add name="Default" connectionString="Data Source=.;Initial Catalog=EFDb;Integrated Security=true"/> </connectionStrings> </configuration>View Code
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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