C#操作SQLite数据库增、删、改、查 欢迎转载
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C#操作SQLite数据库增、删、改、查 欢迎转载
转载记得留下链接地址哦
最想项目上要使用SQLite数据库，不怕大伙笑话毕业四年了，一直使用Oracle或者MySQL或者SQLServer，但是真的是没有用过SQLite数据库，据说非常轻量级，但是真没有用过，于是网上大概搜索下，例子比较多，但是么有一个完整的，即使有，也五花八门。。看的人头晕，可能对于他们大神来讲这都太简单了，算求了更新一篇，新来的小伙伴请看下文，大神你就直接飘过吧!
本例子运行效果
正式开始吧
1.SQLite的下载安装
自然官网下载对应版本即可，我这里下载的是 Precompiled Binaries for 32-bit Windows (.NET Framework 4.0) 不愿意下载的 可以直接使用我下载过的 点击这里下载
2.减压找出我们所需要的库文件 这里我们只需要俩个文件下图所示
3.下载一个数据库管理系统来创建数据库
我是用的是SQLiteStudio3.1.1版本 自己下载吧 下载地址：https://sqlitestudio.pl/index.rvt?act=download?
4.创建数据库以及表
这里创建一个简单的表 UserInfo 完了代码中会有这个数据库
5.开始使用大伙所熟悉的VS了创建相关类
userinfo的Mode类
1 /// <summary>
2 /// UserInfo:实体类(属性说明自动提取数据库字段的描述信息)
3 /// </summary>
4 [Serializable]
5 public partial class UserInfo
6 {
7 public UserInfo()
8 { }
9 #region Model
10 private int _id;
11 private string _username;
12 private string _pwd;
13 private int? _age;
14 /// <summary>
15 ///
16 /// </summary>
17 public int ID
18 {
19 set { _id = value; }
20 get { return _id; }
21 }
22 /// <summary>
23 ///
24 /// </summary>
25 public string UserName
26 {
27 set { _username = value; }
28 get { return _username; }
29 }
30 /// <summary>
31 ///
32 /// </summary>
33 public string Pwd
34 {
35 set { _pwd = value; }
36 get { return _pwd; }
37 }
38 /// <summary>
39 ///
40 /// </summary>
41 public int? Age
42 {
43 set { _age = value; }
44 get { return _age; }
45 }
46 #endregion Model
47
48 }
UserInfo 的Dal类
1 /// <summary>
2 /// 数据访问类:UserInfo
3 /// </summary>
4 public partial class UserInfo
5 {
6 public UserInfo()
7 { }
8 #region BasicMethod
9
10 /// <summary>
11 /// 得到最大ID
12 /// </summary>
13 public int GetMaxId()
14 {
15 return DbHelperSQLite.GetMaxID("ID", "UserInfo");
16 }
17
18 /// <summary>
19 /// 是否存在该记录
20 /// </summary>
21 public bool Exists(int ID)
22 {
23 StringBuilder strSql = new StringBuilder();
24 strSql.Append("select count(1) from UserInfo");
25 strSql.Append(" where ID=@ID ");
26 SQLiteParameter[] parameters = {
27 new SQLiteParameter("@ID", DbType.Int32,8) };
28 parameters[0].Value = ID;
29
30 return DbHelperSQLite.Exists(strSql.ToString(), parameters);
31 }
32
33
34 /// <summary>
35 /// 增加一条数据
36 /// </summary>
37 public bool Add(Model.UserInfo model)
38 {
39 StringBuilder strSql = new StringBuilder();
40 strSql.Append("insert into UserInfo(");
41 strSql.Append("UserName,Pwd,Age)");
42 strSql.Append(" values (");
43 strSql.Append("@UserName,@Pwd,@Age)");
44 SQLiteParameter[] parameters = {
45 new SQLiteParameter("@UserName", DbType.String,50),
46 new SQLiteParameter("@Pwd", DbType.String,25),
47 new SQLiteParameter("@Age", DbType.Int32,8)};
48 parameters[0].Value = model.UserName;
49 parameters[1].Value = model.Pwd;
50 parameters[2].Value = model.Age;
51
52 int rows = DbHelperSQLite.ExecuteSql(strSql.ToString(), parameters);
53 if (rows > 0)
54 {
55 return true;
56 }
57 else
58 {
59 return false;
60 }
61 }
62 /// <summary>
63 /// 更新一条数据
64 /// </summary>
65 public bool Update(Model.UserInfo model)
66 {
67 StringBuilder strSql = new StringBuilder();
68 strSql.Append("update UserInfo set ");
69 strSql.Append("UserName=@UserName,");
70 strSql.Append("Pwd=@Pwd,");
71 strSql.Append("Age=@Age");
72 strSql.Append(" where ID=@ID ");
73 SQLiteParameter[] parameters = {
74 new SQLiteParameter("@UserName", DbType.String,50),
75 new SQLiteParameter("@Pwd", DbType.String,25),
76 new SQLiteParameter("@Age", DbType.Int32,8),
77 new SQLiteParameter("@ID", DbType.Int32,8)};
78 parameters[0].Value = model.UserName;
79 parameters[1].Value = model.Pwd;
80 parameters[2].Value = model.Age;
81 parameters[3].Value = model.ID;
82
83 int rows = DbHelperSQLite.ExecuteSql(strSql.ToString(), parameters);
84 if (rows > 0)
85 {
86 return true;
87 }
88 else
89 {
90 return false;
91 }
92 }
93
94 /// <summary>
95 /// 删除一条数据
96 /// </summary>
97 public bool Delete(int ID)
98 {
99
100 StringBuilder strSql = new StringBuilder();
101 strSql.Append("delete from UserInfo ");
102 strSql.Append(" where ID=@ID ");
103 SQLiteParameter[] parameters = {
104 new SQLiteParameter("@ID", DbType.Int32,8) };
105 parameters[0].Value = ID;
106
107 int rows = DbHelperSQLite.ExecuteSql(strSql.ToString(), parameters);
108 if (rows > 0)
109 {
110 return true;
111 }
112 else
113 {
114 return false;
115 }
116 }
117 /// <summary>
118 /// 批量删除数据
119 /// </summary>
120 public bool DeleteList(string IDlist)
121 {
122 StringBuilder strSql = new StringBuilder();
123 strSql.Append("delete from UserInfo ");
124 strSql.Append(" where ID in (" + IDlist + ") ");
125 int rows = DbHelperSQLite.ExecuteSql(strSql.ToString());
126 if (rows > 0)
127 {
128 return true;
129 }
130 else
131 {
132 return false;
133 }
134 }
135
136
137 /// <summary>
138 /// 得到一个对象实体
139 /// </summary>
140 public Model.UserInfo GetModel(int ID)
141 {
142
143 StringBuilder strSql = new StringBuilder();
144 strSql.Append("select ID,UserName,Pwd,Age from UserInfo ");
145 strSql.Append(" where ID=@ID ");
146 SQLiteParameter[] parameters = {
147 new SQLiteParameter("@ID", DbType.Int32,8) };
148 parameters[0].Value = ID;
149
150 Model.UserInfo model = new Model.UserInfo();
151 DataSet ds = DbHelperSQLite.Query(strSql.ToString(), parameters);
152 if (ds.Tables[0].Rows.Count > 0)
153 {
154 return DataRowToModel(ds.Tables[0].Rows[0]);
155 }
156 else
157 {
158 return null;
159 }
160 }
161
162
163 /// <summary>
164 /// 得到一个对象实体
165 /// </summary>
166 public Model.UserInfo DataRowToModel(DataRow row)
167 {
168 Model.UserInfo model = new Model.UserInfo();
169 if (row != null)
170 {
171 if (row["ID"] != null && row["ID"].ToString() != "")
172 {
173 model.ID = int.Parse(row["ID"].ToString());
174 }
175 if (row["UserName"] != null)
176 {
177 model.UserName = row["UserName"].ToString();
178 }
179 if (row["Pwd"] != null)
180 {
181 model.Pwd = row["Pwd"].ToString();
182 }
183 if (row["Age"] != null && row["Age"].ToString() != "")
184 {
185 model.Age = int.Parse(row["Age"].ToString());
186 }
187 }
188 return model;
189 }
190
191 /// <summary>
192 /// 获得数据列表
193 /// </summary>
194 public DataSet GetList(string strWhere)
195 {
196 StringBuilder strSql = new StringBuilder();
197 strSql.Append("select ID,UserName,Pwd,Age ");
198 strSql.Append(" FROM UserInfo ");
199 if (strWhere.Trim() != "")
200 {
201 strSql.Append(" where " + strWhere);
202 }
203 return DbHelperSQLite.Query(strSql.ToString());
204 }
205
206 /// <summary>
207 /// 获取记录总数
208 /// </summary>
209 public int GetRecordCount(string strWhere)
210 {
211 StringBuilder strSql = new StringBuilder();
212 strSql.Append("select count(1) FROM UserInfo ");
213 if (strWhere.Trim() != "")
214 {
215 strSql.Append(" where " + strWhere);
216 }
217 object obj = DbHelperSQLite.GetSingle(strSql.ToString());
218 if (obj == null)
219 {
220 return 0;
221 }
222 else
223 {
224 return Convert.ToInt32(obj);
225 }
226 }
227 /// <summary>
228 /// 分页获取数据列表
229 /// </summary>
230 public DataSet GetListByPage(string strWhere, string orderby, int startIndex, int endIndex)
231 {
232 StringBuilder strSql = new StringBuilder();
233 strSql.Append("SELECT * FROM ( ");
234 strSql.Append(" SELECT ROW_NUMBER() OVER (");
235 if (!string.IsNullOrEmpty(orderby.Trim()))
236 {
237 strSql.Append("order by T." + orderby);
238 }
239 else
240 {
241 strSql.Append("order by T.ID desc");
242 }
243 strSql.Append(")AS Row, T.* from UserInfo T ");
244 if (!string.IsNullOrEmpty(strWhere.Trim()))
245 {
246 strSql.Append(" WHERE " + strWhere);
247 }
248 strSql.Append(" ) TT");
249 strSql.AppendFormat(" WHERE TT.Row between {0} and {1}", startIndex, endIndex);
250 return DbHelperSQLite.Query(strSql.ToString());
251 }
252
253 #endregion BasicMethod
254 }
Userinfo的BLL类
1 public partial class UserInfo
2 {
3 private readonly DAL.UserInfo dal = new DAL.UserInfo();
4 public UserInfo()
5 { }
6 #region BasicMethod
7
8 /// <summary>
9 /// 得到最大ID
10 /// </summary>
11 public int GetMaxId()
12 {
13 return dal.GetMaxId();
14 }
15
16 /// <summary>
17 /// 是否存在该记录
18 /// </summary>
19 public bool Exists(int ID)
20 {
21 return dal.Exists(ID);
22 }
23
24 /// <summary>
25 /// 增加一条数据
26 /// </summary>
27 public bool Add(Model.UserInfo model)
28 {
29 return dal.Add(model);
30 }
31
32 /// <summary>
33 /// 更新一条数据
34 /// </summary>
35 public bool Update(Model.UserInfo model)
36 {
37 return dal.Update(model);
38 }
39
40 /// <summary>
41 /// 删除一条数据
42 /// </summary>
43 public bool Delete(int ID)
44 {
45
46 return dal.Delete(ID);
47 }
48 /// <summary>
49 /// 删除一条数据
50 /// </summary>
51 public bool DeleteList(string IDlist)
52 {
53 return dal.DeleteList(IDlist);
54 }
55
56 /// <summary>
57 /// 得到一个对象实体
58 /// </summary>
59 public Model.UserInfo GetModel(int ID)
60 {
61
62 return dal.GetModel(ID);
63 }
64
65 ///// <summary>
66 ///// 得到一个对象实体，从缓存中
67 ///// </summary>
68 //public Model.UserInfo GetModelByCache(int ID)
69 //{
70
71 // string CacheKey = "UserInfoModel-" + ID;
72 // object objModel = Common.DataCache.GetCache(CacheKey);
73 // if (objModel == null)
74 // {
75 // try
76 // {
77 // objModel = dal.GetModel(ID);
78 // if (objModel != null)
79 // {
80 // int ModelCache = Maticsoft.Common.ConfigHelper.GetConfigInt("ModelCache");
81 // Maticsoft.Common.DataCache.SetCache(CacheKey, objModel, DateTime.Now.AddMinutes(ModelCache), TimeSpan.Zero);
82 // }
83 // }
84 // catch { }
85 // }
86 // return (Maticsoft.Model.UserInfo)objModel;
87 //}
88
89 /// <summary>
90 /// 获得数据列表
91 /// </summary>
92 public DataSet GetList(string strWhere)
93 {
94 return dal.GetList(strWhere);
95 }
96 /// <summary>
97 /// 获得数据列表
98 /// </summary>
99 public List<Model.UserInfo> GetModelList(string strWhere)
100 {
101 DataSet ds = dal.GetList(strWhere);
102 return DataTableToList(ds.Tables[0]);
103 }
104 /// <summary>
105 /// 获得数据列表
106 /// </summary>
107 public List<Model.UserInfo> DataTableToList(DataTable dt)
108 {
109 List<Model.UserInfo> modelList = new List<Model.UserInfo>();
110 int rowsCount = dt.Rows.Count;
111 if (rowsCount > 0)
112 {
113 Model.UserInfo model;
114 for (int n = 0; n < rowsCount; n++)
115 {
116 model = dal.DataRowToModel(dt.Rows[n]);
117 if (model != null)
118 {
119 modelList.Add(model);
120 }
121 }
122 }
123 return modelList;
124 }
125
126 /// <summary>
127 /// 获得数据列表
128 /// </summary>
129 public DataSet GetAllList()
130 {
131 return GetList("");
132 }
133
134 /// <summary>
135 /// 分页获取数据列表
136 /// </summary>
137 public int GetRecordCount(string strWhere)
138 {
139 return dal.GetRecordCount(strWhere);
140 }
141 /// <summary>
142 /// 分页获取数据列表
143 /// </summary>
144 public DataSet GetListByPage(string strWhere, string orderby, int startIndex, int endIndex)
145 {
146 return dal.GetListByPage(strWhere, orderby, startIndex, endIndex);
147 }
148 /// <summary>
149 /// 分页获取数据列表
150 /// </summary>
151 //public DataSet GetList(int PageSize,int PageIndex,string strWhere)
152 //{
153 //return dal.GetList(PageSize,PageIndex,strWhere);
154 //}
155
156 #endregion BasicMethod
157 #region ExtensionMethod
158
159 #endregion ExtensionMethod
160 }
创建SQLite帮助类
1 /// <summary>
2 /// 数据访问基础类(基于SQLite)
3 /// 可以用户可以修改满足自己项目的需要。
4 /// </summary>
5 public abstract class DbHelperSQLite
6 {
7 //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.
8 public static string connectionString = CreateConnectionString();
9 public DbHelperSQLite()
10 {
11 }
12 private static string CreateConnectionString()
13 {
14
15 string dbName = ConfigurationManager.AppSettings["SQLiteDB"];
16 string sqlLitePath = "data source=" + System.Environment.CurrentDirectory+"\\"+dbName + ";version=3;";
17 return sqlLitePath;
18 }
19
20 #region 公用方法
21
22 public static int GetMaxID(string FieldName, string TableName)
23 {
24 string strsql = "select max(" + FieldName + ")+1 from " + TableName;
25 object obj = GetSingle(strsql);
26 if (obj == null)
27 {
28 return 1;
29 }
30 else
31 {
32 return int.Parse(obj.ToString());
33 }
34 }
35 public static bool Exists(string strSql)
36 {
37 object obj = GetSingle(strSql);
38 int cmdresult;
39 if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
40 {
41 cmdresult = 0;
42 }
43 else
44 {
45 cmdresult = int.Parse(obj.ToString());
46 }
47 if (cmdresult == 0)
48 {
49 return false;
50 }
51 else
52 {
53 return true;
54 }
55 }
56 public static bool Exists(string strSql, params SQLiteParameter[] cmdParms)
57 {
58 object obj = GetSingle(strSql, cmdParms);
59 int cmdresult;
60 if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
61 {
62 cmdresult = 0;
63 }
64 else
65 {
66 cmdresult = int.Parse(obj.ToString());
67 }
68 if (cmdresult == 0)
69 {
70 return false;
71 }
72 else
73 {
74 return true;
75 }
76 }
77
78 #endregion
79
80 #region 执行简单SQL语句
81
82 /// <summary>
83 /// 执行SQL语句，返回影响的记录数
84 /// </summary>
85 /// <param name="SQLString">SQL语句</param>
86 /// <returns>影响的记录数</returns>
87 public static int ExecuteSql(string SQLString)
88 {
89 using (SQLiteConnection connection = new SQLiteConnection(connectionString))
90 {
91 using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection))
92 {
93 try
94 {
95 connection.Open();
96 int rows = cmd.ExecuteNonQuery();
97 return rows;
98 }
99 catch (System.Data.SQLite.SQLiteException E)
100 {
101 connection.Close();
102 throw new Exception(E.Message);
103 }
104 }
105 }
106 }
107
108 /// <summary>
109 /// 执行多条SQL语句，实现数据库事务。
110 /// </summary>
111 /// <param name="SQLStringList">多条SQL语句</param>
112 public static void ExecuteSqlTran(ArrayList SQLStringList)
113 {
114 using (SQLiteConnection conn = new SQLiteConnection(connectionString))
115 {
116 conn.Open();
117 SQLiteCommand cmd = new SQLiteCommand();
118 cmd.Connection = conn;
119 SQLiteTransaction tx = conn.BeginTransaction();
120 cmd.Transaction = tx;
121 try
122 {
123 for (int n = 0; n < SQLStringList.Count; n++)
124 {
125 string strsql = SQLStringList[n].ToString();
126 if (strsql.Trim().Length > 1)
127 {
128 cmd.CommandText = strsql;
129 cmd.ExecuteNonQuery();
130 }
131 }
132 tx.Commit();
133 }
134 catch (System.Data.SQLite.SQLiteException E)
135 {
136 tx.Rollback();
137 throw new Exception(E.Message);
138 }
139 }
140 }
141 /// <summary>
142 /// 执行带一个存储过程参数的的SQL语句。
143 /// </summary>
144 /// <param name="SQLString">SQL语句</param>
145 /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
146 /// <returns>影响的记录数</returns>
147 public static int ExecuteSql(string SQLString, string content)
148 {
149 using (SQLiteConnection connection = new SQLiteConnection(connectionString))
150 {
151 SQLiteCommand cmd = new SQLiteCommand(SQLString, connection);
152 SQLiteParameter myParameter = new SQLiteParameter("@content", DbType.String);
153 myParameter.Value = content;
154 cmd.Parameters.Add(myParameter);
155 try
156 {
157 connection.Open();
158 int rows = cmd.ExecuteNonQuery();
159 return rows;
160 }
161 catch (System.Data.SQLite.SQLiteException E)
162 {
163 throw new Exception(E.Message);
164 }
165 finally
166 {
167 cmd.Dispose();
168 connection.Close();
169 }
170 }
171 }
172 /// <summary>
173 /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
174 /// </summary>
175 /// <param name="strSQL">SQL语句</param>
176 /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
177 /// <returns>影响的记录数</returns>
178 public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
179 {
180 using (SQLiteConnection connection = new SQLiteConnection(connectionString))
181 {
182 SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);
183 SQLiteParameter myParameter = new SQLiteParameter("@fs", DbType.Binary);
184 myParameter.Value = fs;
185 cmd.Parameters.Add(myParameter);
186 try
187 {
188 connection.Open();
189 int rows = cmd.ExecuteNonQuery();
190 return rows;
191 }
192 catch (System.Data.SQLite.SQLiteException E)
193 {
194 throw new Exception(E.Message);
195 }
196 finally
197 {
198 cmd.Dispose();
199 connection.Close();
200 }
201 }
202 }
203
204 /// <summary>
205 /// 执行一条计算查询结果语句，返回查询结果（object）。
206 /// </summary>
207 /// <param name="SQLString">计算查询结果语句</param>
208 /// <returns>查询结果（object）</returns>
209 public static object GetSingle(string SQLString)
210 {
211 using (SQLiteConnection connection = new SQLiteConnection(connectionString))
212 {
213 using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection))
214 {
215 try
216 {
217 connection.Open();
218 object obj = cmd.ExecuteScalar();
219 if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
220 {
221 return null;
222 }
223 else
224 {
225 return obj;
226 }
227 }
228 catch (System.Data.SQLite.SQLiteException e)
229 {
230 connection.Close();
231 throw new Exception(e.Message);
232 }
233 }
234 }
235 }
236 /// <summary>
237 /// 执行查询语句，返回SQLiteDataReader
238 /// </summary>
239 /// <param name="strSQL">查询语句</param>
240 /// <returns>SQLiteDataReader</returns>
241 public static SQLiteDataReader ExecuteReader(string strSQL)
242 {
243 SQLiteConnection connection = new SQLiteConnection(connectionString);
244 SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);
245 try
246 {
247 connection.Open();
248 SQLiteDataReader myReader = cmd.ExecuteReader();
249 return myReader;
250 }
251 catch (System.Data.SQLite.SQLiteException e)
252 {
253 throw new Exception(e.Message);
254 }
255
256 }
257 /// <summary>
258 /// 执行查询语句，返回DataSet
259 /// </summary>
260 /// <param name="SQLString">查询语句</param>
261 /// <returns>DataSet</returns>
262 public static DataSet Query(string SQLString)
263 {
264 using (SQLiteConnection connection = new SQLiteConnection(connectionString))
265 {
266 DataSet ds = new DataSet();
267 try
268 {
269 connection.Open();
270 SQLiteDataAdapter command = new SQLiteDataAdapter(SQLString, connection);
271 command.Fill(ds, "ds");
272 }
273 catch (System.Data.SQLite.SQLiteException ex)
274 {
275 throw new Exception(ex.Message);
276 }
277 return ds;
278 }
279 }
280
281
282 #endregion
283
284 #region 执行带参数的SQL语句
285
286 /// <summary>
287 /// 执行SQL语句，返回影响的记录数
288 /// </summary>
289 /// <param name="SQLString">SQL语句</param>
290 /// <returns>影响的记录数</returns>
291 public static int ExecuteSql(string SQLString, params SQLiteParameter[] cmdParms)
292 {
293 using (SQLiteConnection connection = new SQLiteConnection(connectionString))
294 {
295 using (SQLiteCommand cmd = new SQLiteCommand())
296 {
297 try
298 {
299 PrepareCommand(cmd, connection, null, SQLString, cmdParms);
300 int rows = cmd.ExecuteNonQuery();
301 cmd.Parameters.Clear();
302 return rows;
303 }
304 catch (System.Data.SQLite.SQLiteException E)
305 {
306 throw new Exception(E.Message);
307 }
308 }
309 }
310 }
311
312
313 /// <summary>
314 /// 执行多条SQL语句，实现数据库事务。
315 /// </summary>
316 /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SQLiteParameter[]）</param>
317 public static void ExecuteSqlTran(Hashtable SQLStringList)
318 {
319 using (SQLiteConnection conn = new SQLiteConnection(connectionString))
320 {
321 conn.Open();
322 using (SQLiteTransaction trans = conn.BeginTransaction())
323 {
324 SQLiteCommand cmd = new SQLiteCommand();
325 try
326 {
327 //循环
328 foreach (DictionaryEntry myDE in SQLStringList)
329 {
330 string cmdText = myDE.Key.ToString();
331 SQLiteParameter[] cmdParms = (SQLiteParameter[])myDE.Value;
332 PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
333 int val = cmd.ExecuteNonQuery();
334 cmd.Parameters.Clear();
335
336 trans.Commit();
337 }
338 }
339 catch
340 {
341 trans.Rollback();
342 throw;
343 }
344 }
345 }
346 }
347
348
349 /// <summary>
350 /// 执行一条计算查询结果语句，返回查询结果（object）。
351 /// </summary>
352 /// <param name="SQLString">计算查询结果语句</param>
353 /// <returns>查询结果（object）</returns>
354 public static object GetSingle(string SQLString, params SQLiteParameter[] cmdParms)
355 {
356 using (SQLiteConnection connection = new SQLiteConnection(connectionString))
357 {
358 using (SQLiteCommand cmd = new SQLiteCommand())
359 {
360 try
361 {
362 PrepareCommand(cmd, connection, null, SQLString, cmdParms);
363 object obj = cmd.ExecuteScalar();
364 cmd.Parameters.Clear();
365 if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
366 {
367 return null;
368 }
369 else
370 {
371 return obj;
372 }
373 }
374 catch (System.Data.SQLite.SQLiteException e)
375 {
376 throw new Exception(e.Message);
377 }
378 }
379 }
380 }
381
382 /// <summary>
383 /// 执行查询语句，返回SQLiteDataReader
384 /// </summary>
385 /// <param name="strSQL">查询语句</param>
386 /// <returns>SQLiteDataReader</returns>
387 public static SQLiteDataReader ExecuteReader(string SQLString, params SQLiteParameter[] cmdParms)
388 {
389 SQLiteConnection connection = new SQLiteConnection(connectionString);
390 SQLiteCommand cmd = new SQLiteCommand();
391 try
392 {
393 PrepareCommand(cmd, connection, null, SQLString, cmdParms);
394 SQLiteDataReader myReader = cmd.ExecuteReader();
395 cmd.Parameters.Clear();
396 return myReader;
397 }
398 catch (System.Data.SQLite.SQLiteException e)
399 {
400 throw new Exception(e.Message);
401 }
402
403 }
404
405 /// <summary>
406 /// 执行查询语句，返回DataSet
407 /// </summary>
408 /// <param name="SQLString">查询语句</param>
409 /// <returns>DataSet</returns>
410 public static DataSet Query(string SQLString, params SQLiteParameter[] cmdParms)
411 {
412 using (SQLiteConnection connection = new SQLiteConnection(connectionString))
413 {
414 SQLiteCommand cmd = new SQLiteCommand();
415 PrepareCommand(cmd, connection, null, SQLString, cmdParms);
416 using (SQLiteDataAdapter da = new SQLiteDataAdapter(cmd))
417 {
418 DataSet ds = new DataSet();
419 try
420 {
421 da.Fill(ds, "ds");
422 cmd.Parameters.Clear();
423 }
424 catch (System.Data.SQLite.SQLiteException ex)
425 {
426 throw new Exception(ex.Message);
427 }
428 return ds;
429 }
430 }
431 }
432
433
434 private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, SQLiteTransaction trans, string cmdText, SQLiteParameter[] cmdParms)
435 {
436 if (conn.State != ConnectionState.Open)
437 conn.Open();
438 cmd.Connection = conn;
439 cmd.CommandText = cmdText;
440 if (trans != null)
441 cmd.Transaction = trans;
442 cmd.CommandType = CommandType.Text;//cmdType;
443 if (cmdParms != null)
444 {
445 foreach (SQLiteParameter parm in cmdParms)
446 cmd.Parameters.Add(parm);
447 }
448 }
449
450 #endregion
451
452
453
454 }
6.创建一个WinForm窗体用于测试
大概是这样的，我用的是VS2017
窗体代码大概是这样的比较简单，只是实现简单的操作，具体细节那就交个大家了。。。
1 public partial class Form1 : Form
2 {
3 public Form1()
4 {
5 InitializeComponent();
6 }
7
8
9 BLL.UserInfo bll = new BLL.UserInfo();
10
11
12 //数据库连接
13 SQLiteConnection m_dbConnection;
14 private void button1_Click(object sender, EventArgs e)
15 {
16
17 DataSet ds = bll.GetAllList();
18
19 this.dataGridView1.DataSource = ds.Tables[0];
20
21 }
22
23 int count = 0;
24 private void button2_Click(object sender, EventArgs e)
25 {
26 count++;
27 Model.UserInfo userInfo = new Model.UserInfo();
28 userInfo.UserName = "Count" + count;
29 userInfo.Pwd = "123456";
30 userInfo.Age = count;
31
32 bll.Add(userInfo);
33
34 DataSet ds = bll.GetAllList();
35 this.dataGridView1.DataSource = ds.Tables[0];
36
37 }
38
39 private void button3_Click(object sender, EventArgs e)
40 {
41
42 Model.UserInfo userInfo = new Model.UserInfo();
43 userInfo.ID = int.Parse(this.label1.Text);
44 userInfo.UserName = this.textBox1.Text;
45 userInfo.Pwd = this.textBox2.Text;
46 userInfo.Age = int.Parse(this.textBox3.Text);
47 bll.Update(userInfo);
48
49
50 DataSet ds = bll.GetAllList();
51 this.dataGridView1.DataSource = ds.Tables[0];
52
53
54 }
55
56 private void dataGridView1_MouseClick(object sender, MouseEventArgs e)
57 {
58 DataGridViewRow row = this.dataGridView1.CurrentRow;
59 this.label1.Text = row.Cells[0].Value.ToString();
60 this.textBox1.Text = row.Cells[1].Value.ToString();
61 this.textBox2.Text = row.Cells[2].Value.ToString();
62 this.textBox3.Text = row.Cells[3].Value.ToString();
63
64
65 }
66
67 private void button4_Click(object sender, EventArgs e)
68 {
69 bll.Delete(int.Parse(this.label1.Text));
70
71
72 DataSet ds = bll.GetAllList();
73 this.dataGridView1.DataSource = ds.Tables[0];
74 }
75
76 private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
77 {
78
79 Process.Start("IExplore", "https://www.cnblogs.com/JiYF/");
80 }
81 }
运行效果
项目结构文件
到这里就完了，新手自己去下载调试吧，。。。。。爱你们哟 么么哒！?(^_-)
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