using System; using System.IO; using System.Text; using System.Data; using System.Data.SqlServerCe; using System.Collections; using System.Windows.Forms; using System.Data.Common;//说明--wince的数据库操作和Windows的大同小异,建议有些语句可以在wince数据库亲测。 namespace cedb { /// <summary> /// 数据库操作类 /// </summary> public static class DBSqlServer { /// <summary> /// 获取datatable /// </summary> /// <param name="sql"></param> public static DataTable GetDT(string sql) { SqlCeConnection conn = null; try { conn = new SqlCeConnection("Data Source = 3190.sdf"); try { conn.Open(); } catch (Exception ex) { throw; } SqlCeCommand cmd = conn.CreateCommand(); cmd.CommandText = sql; SqlCeDataAdapter ada = new SqlCeDataAdapter(cmd); DataTable dts = new DataTable(); ada.Fill(dts); ada.Dispose(); conn.Close(); return dts; } catch { throw; } finally { if (null != conn) conn.Close(); } } /// <summary> /// 获取ExecuteScalar,即数据中第一行第一列值 /// </summary> /// <param name="sql"></param> public static Object GetExecuteScalar(string sql) { SqlCeConnection conn = null; try { conn = new SqlCeConnection("Data Source = 3190.sdf"); try { conn.Open(); } catch { throw new NullReferenceException("连接数据库失败"); } SqlCeCommand cmd = conn.CreateCommand(); cmd.CommandText = sql; return cmd.ExecuteScalar(); } catch (SqlCeException e) { throw new NullReferenceException("操作数据库失败"); } finally { if(conn.State == ConnectionState.Open) conn.Close(); } } public static void ExecuteNonQuery(string sql)//执行sql语句,无返回 { SqlCeConnection conn = null; try { conn = new SqlCeConnection("Data Source = 3190.sdf"); try { conn.Open(); } catch { throw new NullReferenceException("连接数据库失败"); } SqlCeCommand cmd = conn.CreateCommand(); cmd.CommandText = sql; cmd.ExecuteNonQuery(); } catch (SqlCeException e) { throw new NullReferenceException("操作数据库失败"); } finally { if(conn.State == ConnectionState.Open) conn.Close(); } } } }
时间: 2024-08-06 22:40:25