C# SQLite数据库操作类，

C# SQLite数据库操作类，

C# SQLite数据库操作类，可建立SQLiteConnection 数据库连接、Query数据库、执行ExcDbCommand SQL命令，以及SQLiteParameter[] 、ExecuteReader()、ExecuteNonQuery()、SQLiteDataAdapter等操作。

01	using System;

02	using System.Collections.Generic;

03	using System.Linq;

04	using System.Text;

05	using System.Configuration;

06	using System.Data.SQLite;

07	using System.Data;

08	namespace DBHelper.SQLite

09

{

10	public class SQLiteHelper

11

{

12	static string _connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

13	SQLiteConnection _connection;

14

15	public SQLiteHelper()

16

{

17	_connection = new SQLiteConnection(_connectionString);

18

}

19	public SQLiteHelper(string connectionString)

20

:this()

21

{

22	_connectionString = connectionString;

23

}

24

25	public void Open()

26

{

27	if (_connection.State != ConnectionState.Open)

28	_connection.Open();

29

}

30	public void Close()

31

{

32	if (_connection.State != ConnectionState.Closed)

33	_connection.Close();

34

}

35

36	public DataSet Query(string sql)

37

{

38	return Query(sql, null);

39

}

40

41	public DataSet Query(string sql, params SQLiteParameter[] parameters)

42

{

43	//this.Open();

44	SQLiteCommand command = ExcDbCommand(sql, parameters);

45	DataSet ds = new DataSet();

46	SQLiteDataAdapter da = new SQLiteDataAdapter(command);

47	da.Fill(ds);

48	//this.Close();

49	return ds;

50

}

51

52	public bool Exc(string sql)

53

{

54	return Exc(sql, null);

55

}

56	public bool Exc(string sql, params SQLiteParameter[] parameters)

57

{

58	SQLiteCommand command = ExcDbCommand(sql, parameters);

59	this.Open();

60	int result = command.ExecuteNonQuery();

61	this.Close();

62	return result > 0;

63

}

64	public SQLiteDataReader Read(string sql)

65

{

66	return Read(sql, null);

67

}

68	public SQLiteDataReader Read(string sql, params SQLiteParameter[] parameters)

69

{

70	SQLiteCommand command = ExcDbCommand(sql, parameters);

71	this.Open();

72	SQLiteDataReader reader = command.ExecuteReader();

73	//this.Close();

74	return reader;

75

}

76	SQLiteCommand ExcDbCommand(string sql, SQLiteParameter[] parameters)

77

{

78	SQLiteCommand command = new SQLiteCommand(sql, _connection);

79	command.CommandType = CommandType.Text;

80	if (parameters == null || parameters.Length == 0)

81	return command;

82	foreach (SQLiteParameter param in parameters)

83

{

84	if(param != null)

85	command.Parameters.Add(param);

86

}

87	return command;

88

}

89

}

90

}

以上文件可保存文件名为：SQLiteHelper.cs