文件名称：DBHelper方便连接数据库 DBHelper
文件大小：4KB
文件格式：CS
更新时间：2012-01-18 09:25:42
DBHelper
using System; using System.Collections; using System.Collections.Generic; using System.Text; using System.Data; using System.Data.SqlClient; using System.Configuration; namespace MyOfficeDAL { public static class DBHelper { private static SqlConnection connection; public static SqlConnection Connection { get { string connectionString = ConfigurationManager.ConnectionStrings["MyOfficeConnectionString"].ConnectionString; connection = new SqlConnection(connectionString); if (connection == null) { connection.Open(); } else if (connection.State == System.Data.ConnectionState.Closed) { connection.Open(); } else if (connection.State == System.Data.ConnectionState.Broken) { connection.Close(); connection.Open(); } return connection; } } public static int ExecuteCommand(string safeSql) { SqlCommand cmd = new SqlCommand(safeSql, Connection); int result = cmd.ExecuteNonQuery(); return result; } public static int ExecuteCommand(string sql, params SqlParameter[] values) { SqlCommand cmd = new SqlCommand(sql, Connection); cmd.Parameters.AddRange(values); return cmd.ExecuteNonQuery(); } public static string ReturnStringScalar(string safeSql) { SqlCommand cmd = new SqlCommand(safeSql, Connection); try { string result = cmd.ExecuteScalar().ToString(); return result; } catch (Exception ex) { return "0"; } connection.Close(); } public static int GetScalar(string safeSql) { SqlCommand cmd = new SqlCommand(safeSql, Connection); try { int result = Convert.ToInt32(cmd.ExecuteScalar()); return result; } catch (Exception e) { return 0; } connection.Close(); } public static int GetScalar(string sql, params SqlParameter[] values) { SqlCommand cmd = new SqlCommand(sql, Connection); cmd.Parameters.AddRange(values); int result = Convert.ToInt32(cmd.ExecuteScalar()); return result; connection.Close(); } public static SqlDataReader GetReader(string safeSql) { SqlCommand cmd = new SqlCommand(safeSql, Connection); SqlDataReader reader = cmd.ExecuteReader(); return reader; reader.Close(); reader.Dispose(); } public static SqlDataReader GetReader(string sql, params SqlParameter[] values) { SqlCommand cmd = new SqlCommand(sql, Connection); cmd.Parameters.AddRange(values); SqlDataReader reader = cmd.ExecuteReader(); return reader; reader.Close(); reader.Dispose(); } public static DataTable GetDataSet(string safeSql) { DataSet ds = new DataSet(); SqlCommand cmd = new SqlCommand(safeSql, Connection); SqlDataAdapter da = new SqlDataAdapter(cmd); da.Fill(ds); connection.Close(); connection.Dispose(); return ds.Tables[0]; } public static DataTable GetDataSet(string sql, params SqlParameter[] values) { DataSet ds = new DataSet(); SqlCommand cmd = new SqlCommand(sql, Connection); cmd.Parameters.AddRange(values); SqlDataAdapter da = new SqlDataAdapter(cmd); da.Fill(ds); connection.Close(); connection.Dispose(); return ds.Tables[0]; } } }