更新

CreateEncrptyDB.md

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+```csharp
+
+//internal class UserInfo
+    //{
+    //    [PrimaryKey] [AutoIncrement] public int Id { get; set; }
+
+    //    public string password { get; set; }
+    //}
+private static readonly string path = "ArchiWBSCode.db";
+        private static readonly string path1 = "ts.db";
+
+        private static readonly string pathS = "ArchiWBSCode.sqlite";
+private static void CreateEncryptedDb(string newfilename, string password)
+        {
+            var conn = new SqliteConnectionStringBuilder
+            {
+                DataSource = newfilename,
+                Mode = SqliteOpenMode.ReadWriteCreate,
+                Password = password
+            }.ToString(); //使用这个方式设置密码，避免sql注入
+            //创建SQLite连接
+            using (SqliteConnection connection = new SqliteConnection(conn))
+            {
+                if (connection.State == ConnectionState.Closed)
+                {
+                    connection.Open();
+                    var createTableSqlStr =
+                        @"CREATE TABLE  if not exists ""Alarm"" ( ""Id"" INTEGER NOT NULL, ""AlarmName"" TEXT, ""AlarmTypeId"" INTEGER, PRIMARY KEY ( ""Id"" ) );";
+                    var result = connection.Execute(createTableSqlStr); //使用Dapper执行sql语句创建表
+                    //Console.ReadKey();
+                }
+            }
+        }
+
+        private static int UpdatePassword(string fileName, string oldPassword, string newPassword)
+        {
+            var connectionString = new SqliteConnectionStringBuilder
+            {
+                DataSource = fileName,
+                Mode = SqliteOpenMode.ReadWriteCreate,
+                Password = oldPassword
+            }.ToString();
+
+            using (var connection = new SqliteConnection(connectionString))
+            {
+                connection.Open();
+                using (var command = connection.CreateCommand())
+                {
+                    command.CommandText = "SELECT quote($newPassword);";
+                    command.Parameters.AddWithValue("$newPassword", newPassword);
+                    var quotedNewPassword = command.ExecuteScalar() as string;
+
+                    command.CommandText = "PRAGMA rekey = " + quotedNewPassword;
+                    command.Parameters.Clear();
+                    int x = command.ExecuteNonQuery();
+                    return x;
+                }
+            }
+        }
+
+        private string oldPassword = "123qwe";
+        private string newPassword = "abcd";
+```