这篇文章给大家分享的是有关C#数据访问层的相关知识有哪些的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。
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C#数据访问层1.查询数据库中的数据，返回一个datatable
C#数据访问层2.执行一条SQL语句已重载
using System; using System.Data; using NUnit.Framework; using CodeFilemanger.Project; using System.Data.SqlClient; using System.Configuration; namespace OperatorDB { /// /// Class1 的摘要说明。 /// [NUnit.Framework.TestFixture] public class OperatorDB { private static string strCon = ConfigurationSettings.AppSettings["ConnectionString"] ; private int ModuleId = 1; public static string ConnectionString { get { return strCon; } set { strCon = value; } } #region "初始化" [NUnit.Framework.TestFixtureSetUp] public void Register_Module() { string ModuleName = "OperatorDB"; string ModuleAuthor = "MYM"; string ModuleDescribe = "数据访问模块"; string CreateDatetime = "2003-5-30"; ModuleId = Project.InsertModule( ModuleName, ModuleAuthor, ModuleDescribe, CreateDatetime) ; } [Test] public void Register_Method_SelectData() { string MethodName = "SelectData"; string MethodAuthor = "MYM"; string MethodCreateDateTime = "2005-3-30"; string MethodParaMeters ="ParaMeters(string SqlCommandText, System.Data.DataTable Dt, bool RowsClearr)"; string MethodReturn = "bool"; string MethodCall = "" ; string MethodDescribe = "查询数据库中的数据，返回一个datatable"; Project.InsertMethod(MethodName,MethodAuthor,MethodCreateDateTime,MethodParaMeters,MethodReturn,MethodCall,MethodDescribe,ModuleId); } [Test] public void Register_Method_ExecuteSql() { string MethodName = "ExecuteSql"; string MethodAuthor = "MYM"; string MethodCreateDateTime = "2005-3-30"; string MethodParaMeters ="ParaMeters(string SqlCommandText)"; string MethodReturn = "int"; string MethodCall = "" ; string MethodDescribe = "执行一条SQL语句"; Project.InsertMethod(MethodName,MethodAuthor,MethodCreateDateTime,MethodParaMeters,MethodReturn,MethodCall,MethodDescribe,ModuleId); } [Test] public void Register_Method_SerialNumber() { string MethodName = "SerialNumber"; string MethodAuthor = "MYM"; string MethodCreateDateTime = "2005-3-30"; string MethodParaMeters ="ParaMeters(int index, System.Data.DataTable dt)"; string MethodReturn = "void"; string MethodCall = "" ; string MethodDescribe = "给表的指定列添加序号"; Project.InsertMethod(MethodName,MethodAuthor,MethodCreateDateTime,MethodParaMeters,MethodReturn,MethodCall,MethodDescribe,ModuleId); } #endregion public static bool SelectData(string SqlCommandText, System.Data.DataTable Dt, bool RowsClearr) { strCon = ConfigurationSettings.AppSettings["ConnectionString"]; bool ret = true; if (SqlCommandText != "") { if (RowsClearr) { if (Dt.Rows.Count > 0) { Dt.Rows.Clear(); } } SqlConnection cn = new SqlConnection(strCon); SqlDataAdapter da = new SqlDataAdapter(SqlCommandText, cn); try { cn.Open(); da.Fill(Dt); } catch (System.Exception ex) { ExceptionHand exc = new ExceptionHand(ex); exc.DisplayErrorMessager("OperatorDB","SelectData",SqlCommandText); ret = false; } if (cn.State == ConnectionState.Open) { cn.Close(); } da.Dispose(); } else { ret = false; } return ret; } public static int ExecuteSql(string SqlCommandText) { int ID = 0; strCon = ConfigurationSettings.AppSettings["ConnectionString"]; if (SqlCommandText != "") { SqlConnection cn = new SqlConnection(strCon); SqlCommand cm = new SqlCommand(SqlCommandText, cn); try { cn.Open(); ID = Convert.ToInt32(cm.ExecuteScalar()); } catch (System.Exception ex) { cn.Close(); ExceptionHand exc = new ExceptionHand(ex); exc.DisplayErrorMessager("OperatorDB","ExecuteSql",SqlCommandText); ID = -1; } if (cn.State == ConnectionState.Open) { cn.Close(); } cm.Dispose(); } return ID; } public static int ExecuteSql(SqlCommand Cm) { int ID = 0; strCon = ConfigurationSettings.AppSettings["ConnectionString"]; SqlConnection cn = new SqlConnection(strCon); try { cn.Open(); Cm.Connection = cn; ID = Convert.ToInt32(Cm.ExecuteScalar()); } catch (System.Exception ex) { cn.Close(); ExceptionHand exc = new ExceptionHand(ex); exc.DisplayErrorMessager("OperatorDB","ExecuteSql",Cm.CommandText); ID = -1; } if (cn.State == ConnectionState.Open) { cn.Close(); } Cm.Dispose(); return ID; } public static void SerialNumber(int index, System.Data.DataTable dt) { for (int i = 0; i <= dt.Rows.Count - 1; i++) { dt.Rows[i][index] = i + 1; } } public static void SetSqlCommandValues(SqlCommand Com,DataTable Dt,int Index,int StartIndex) { int i; for (i=StartIndex;i{ Com.Parameters.Add("@" + Dt.Columns[i].ColumnName,Dt.Rows[Index][i]); } } } }感谢各位的阅读！关于“C#数据访问层的相关知识有哪些”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，让大家可以学到更多知识，如果觉得文章不错，可以把它分享出去让更多的人看到吧！