SQLite使用

Posted 2020-12-27 likeheart

首先从https://www.sqlite.org/download.html下载

下载完成后，将文件全部解压到D:\\sqlite

运行sqlite3.exe查看是否正常

下载可视化工具 https://github.com/sqlitebrowser/sqlitebrowser/releases

利用可视化工具创建表结构

准备工作完成，接下来就是C#操作SQLite

在NuGet包管理工具中添加所需的dll

在config文件中配置数据库连接字符串

  <connectionStrings>
    <add name="sqliteConn" connectionString="Data Source=..\\..\\dataBase\\dbAreaInfo.db;Pooling=true;FailIfMissing=false"  providerName="System.Data.SQLite" />
  </connectionStrings>

接下来是一个简单的SQLiteHelper

 1     public class SQLiteHelper
 2     {
 3         private static string connString = System.Configuration.ConfigurationManager.ConnectionStrings["sqliteConn"].ToString();
 4         private static SQLiteConnection conn;
 5 
 6         static SQLiteHelper()
 7         {
 8             conn = new SQLiteConnection(connString);
 9         }
10 
11 
12         /// <summary>
13         /// 查询数据,返回DataSet
14         /// </summary>
15         /// <param name="sql"></param>
16         /// <returns></returns>
17         public static DataSet QuerySql(string sql)
18         {
19             DataSet ds = new DataSet();
20             try
21             {
22                 using (SQLiteDataAdapter adapter = new SQLiteDataAdapter(sql, conn))
23                 {
24                     conn.Open();
25                     adapter.Fill(ds);
26                     conn.Close();
27                 }
28             }
29             catch { }
30             return ds;
31         }
32 
33         /// <summary>
34         /// 执行单条SQL语句
35         /// </summary>
36         /// <param name="sql"></param>
37         /// <returns></returns>
38         public static bool ExecuteSql(string sql)
39         {
40             bool result = false;
41             try
42             {
43                 using (SQLiteCommand cmd = new SQLiteCommand(conn))
44                 {
45                     conn.Open();
46                     cmd.CommandText = sql;
47                     result = cmd.ExecuteNonQuery() > 0;
48                     conn.Close();
49                 }
50             }
51             catch { }
52             return result;
53         }
54 
55         /// <summary>
56         /// 事务执行多条SQL语句
57         /// </summary>
58         /// <param name="lstSql"></param>
59         /// <returns></returns>
60         public static bool ExecuteSql(List<string> lstSql)
61         {
62             bool result = false;
63             try
64             {
65                 using (SQLiteCommand cmd = new SQLiteCommand(conn))
66                 {
67                     conn.Open();
68                     DbTransaction trans = conn.BeginTransaction();
69                     foreach (var sql in lstSql)
70                     {
71                         cmd.CommandText = sql;
72                         cmd.ExecuteNonQuery();
73                     }
74                     trans.Commit();
75                     result = true;
76                     conn.Close();
77                 }
78             }
79             catch { }
80             return result;
81         }
82     }

两个简单的调用例子

查询

 1         /// <summary>
 2         /// 获取区域名称
 3         /// </summary>
 4         /// <param name="areaCode">区域编号</param>
 5         /// <returns></returns>
 6         public string GetAreaName(string areaCode)
 7         {
 8             string result = string.Empty; ;
 9             string sql = "select AreaName from AreaInfo where AreaCode=\'" + areaCode + "\'";
10             DataSet ds = SQLiteHelper.QuerySql(sql);
11             if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count == 1)
12             {
13                 result = ds.Tables[0].Rows[0]["AreaName"].ToString();
14             }
15             return result;
16         }

删除和新增

 1         public void InsertAreaSource()
 2         {
 3             string sql = "delete from AreaInfo";
 4             SQLiteHelper.ExecuteSql(sql);
 5 
 6             AreaInfo areaInfo = new AreaInfo();
 7             List<Area> lstArea = areaInfo.GetAreaInfoFromWeb();
 8             List<string> lstSql = new List<string>();
 9             foreach (Area item in lstArea)
10             {
11                 sql = "INSERT INTO AreaInfo(AreaCode,AreaName) VALUES(\'" + item.AreaCode + "\',\'" + item.AreaName + "\')";
12                 lstSql.Add(sql);
13             }
14             SQLiteHelper.ExecuteSql(lstSql);
15         }