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ssgrestserver/request/DBManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.SQLite;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ssgrestserver.request
+{
+    class DBManager
+    {
+
+
+        #region Singleton
+
+        private volatile static DBManager mInstance = null;
+
+        private static object mSingletonLocker = new object();
+
+        private DBManager()
+        {
+
+            CONNECT_STRING = Program.mainForm.getStartupPath() + @"\ssgCRUD.db";
+            DB_SOURCE = $@"Data Source={CONNECT_STRING}";
+
+
+            try
+            {
+
+                using (var conn = new SQLiteConnection(DB_SOURCE))
+                {
+                    int result = 0;
+
+                    conn.Open();
+                    using (var command = new SQLiteCommand("select count(*) from sqlite_master WHERE Name = 'ssgCRUD'", conn))
+                    {
+                        result = Convert.ToInt32(command.ExecuteScalar());
+                    }
+
+
+                    if (result < 1)
+                    {
+                        string bufTableBuildQuery = @"create table ssgCRUD (seqGFrameNo TEXT PRIMARY KEY, vriNoticeNo TEXT UNIQUE, payload TEXT)";
+
+                        using (var command = new SQLiteCommand(bufTableBuildQuery, conn))
+                        {
+                            command.ExecuteNonQuery();
+                        }
+
+                    }
+
+                }
+
+            }
+            catch (Exception)
+            {
+
+                throw;
+            }
+
+        }
+
+        string CONNECT_STRING = "";
+        string DB_SOURCE = "";
+
+        public static DBManager getInstance()
+        {
+            lock (mSingletonLocker)
+            {
+                if (mInstance == null)
+                {
+                    mInstance = new DBManager();
+                }
+            }
+
+            return mInstance;
+        }
+        #endregion
+
+
+
+        public DataSet sendSelectQuery(string query)
+        {
+            DataSet rtnValue = new DataSet();
+
+            try
+            {
+
+                using (var adapter = new SQLiteDataAdapter(query, DB_SOURCE))
+                {
+                    adapter.Fill(rtnValue, "rtnTable");
+                }
+
+            }
+            catch (Exception ex)
+            {
+                Program.mainForm.recvLog("SQLQUERY_SELECT", ex.ToString());
+            }
+
+            return rtnValue;
+        }
+
+        public bool sendInsertQuery(string query)
+        {
+
+            try
+            {
+
+                using (var conn = new SQLiteConnection(DB_SOURCE))
+                {
+                    conn.Open();
+                    using (var command = new SQLiteCommand(query, conn))
+                    {
+                        command.ExecuteNonQuery();
+                    }
+
+                }
+
+                return true;
+
+            }
+            catch (Exception ex)
+            {
+                Program.mainForm.recvLog("SQLQUERY_INSERT", ex.ToString());
+                return false;
+
+            }
+
+        }
+
+    }
+}