C# SQLiteHelper

 1 public class SQLiteHelpers

 2     {

 3         /// <summary>          

 4         /// ConnectionString样例：Datasource=Test.db3;Pooling=true;FailIfMissing=false  

 5         /// </summary>          

 6         public static string ConnectionString { get; set; }

 7         private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, string cmdText, params object[] p)

 8         {

 9             if (conn.State != ConnectionState.Open)

10                 conn.Open();

11             cmd.Parameters.Clear();

12             cmd.Connection = conn;

13             cmd.CommandText = cmdText;

14             cmd.CommandType = CommandType.Text;

15             cmd.CommandTimeout = 30;

16             if (p != null)

17             {

18                 foreach (object parm in p)

19                     cmd.Parameters.AddWithValue(string.Empty, parm);

20             }

21         }

22         public static DataSet ExecuteQuery(string cmdText, params object[] p)

23         {

24             using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))

25             {

26                 using (SQLiteCommand command = new SQLiteCommand())

27                 {

28                     DataSet ds = new DataSet();

29                     PrepareCommand(command, conn, cmdText, p);

30                     SQLiteDataAdapter da = new SQLiteDataAdapter(command);

31                     da.Fill(ds);

32                     return ds;

33                 }

34             }

35         }

36         public static int ExecuteNonQuery(string cmdText, params object[] p)

37         {

38             using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))

39             {

40                 using (SQLiteCommand command = new SQLiteCommand())

41                 {

42                     PrepareCommand(command, conn, cmdText, p); 

43                     return command.ExecuteNonQuery();

44                 }

45             }

46         }

47         public static SQLiteDataReader ExecuteReader(string cmdText, params object[] p)

48         {

49             using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))

50             {

51                 using (SQLiteCommand command = new SQLiteCommand())

52                 {

53                     PrepareCommand(command, conn, cmdText, p); 

54                     return command.ExecuteReader(CommandBehavior.CloseConnection);

55                 }

56             }

57         }

58         public static object ExecuteScalar(string cmdText, params object[] p)

59         {

60             using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))

61             {

62                 using (SQLiteCommand command = new SQLiteCommand())

63                 {

64                     PrepareCommand(command, conn, cmdText, p); 

65                     return command.ExecuteScalar();

66                 }

67             }

68         }

69     }

70 }