MySQL?? ???? ???? PictureBox? ??
MySQL ???????? ???? ???? PictureBox? ????? ?? ??? ????. :
1. ??????? ??? ??:
<code class="csharp">using(OpenFileDialog ofd = new OpenFileDialog()) { if (ofd.ShowDialog() == DialogResult.OK) { byte[] bytes = File.ReadAllBytes(ofd.FileName); string imageUrl = ofd.FileName.ToString(); MySqlConnection con = new MySqlConnection(connectionString); con.Open(); // Insert image into database MySqlCommand cmd = new MySqlCommand("INSERT INTO reg.img_table(image, id) VALUES (@image, @id)", con); long id = cmd.LastInsertedId; cmd.Parameters.AddWithValue("@image", bytes); cmd.Parameters.AddWithValue("@id", id); cmd.ExecuteNonQuery(); con.Close(); } }</code>
2. ???????? ??? ??:
<code class="csharp">private Image byteArrayToImage(byte[] byteArrayIn) { MemoryStream ms = new MemoryStream(byteArrayIn); Image returnImage = Image.FromStream(ms); return returnImage; } private void photoLoad() { string connectionString = ...; MySqlConnection con = new MySqlConnection(connectionString); byte[] ImageByte = new byte[0]; string query1 = "select image from reg.img_table where id= @id"; MySqlCommand cmd = new MySqlCommand(query1, con); cmd.Parameters.AddWithValue("@id", ...); con.Open(); MySqlDataReader row; row = cmd.ExecuteReader(); while (row.Read()) { ImageByte = (Byte[])(row["image"]); } con.Close(); if (ImageByte != null) { // Convert to bitmap and display in PictureBox roundPictureBox1.Image = byteArrayToImage(ImageByte); roundPictureBox1.Refresh(); } }</code>
?? ???? ????, ??? ??? ?? ??? ?????? ??? img_table? ????? ?????. ??? ??? PictureBox?? ???? ???? ???? ? ???? ???.
? ??? PictureBox?? MySQL ??????? ???? ???? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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MySQL? ?? ???? ?? ??? ??? ? A??, ?? MVCC ? GAP ?? ??? ?? ??? ?? ? ?? ???? ??? ???? ???? ?? ?? ??? ????. ?? ?? ??? ??? ?? (??)? ????? ??? ??? ????? ?? ?? ??? ????? 1. ??? ??? (read committed)? ?? ? ???? ?? ? ??? ?? ? ??? ?? ? ?? ?? ?? ?? ? ? ????. ???, ??? ??? ????? ??? ??;

MySQL? ? ????? ??? ??? ????? ?? ?? ??? ?? ???????. 1. Windows ??? : MySQL ?? ?????? ? ??? ????? (?? ??? ????? C : \ programfiles \ mysql \ mysqlserverx.x \ bin), "? ???"→ "??"→ "Advanced System ??"→ "?? ??", "??? ??", MySQlb in wors in mysqlb in wors in mysqlb in world in that the the the the the seel worl ?? ????? ?? ???? MySQL? ??????-Version Versification; 2.Macos ? Linux ??? : Bash ??? ?? ~/.bashrc ?? ~/.bash_

mysqlworkbench? ??? ?? ??? ?? ??? ?????. ?? ??? ?? ??? ?? ????. 1. Windows ???? %appdata %\ mysql \ workbench \ connections.xml? ????. 2. MacOS ???? ~/Library/ApplicationSupport/MySQL/Workbench/Connections.xml? ????. 3. ????? Linux ???? ~/.mysql/workbench/connections.xml ?? ~/.local/share/data/mysql/wor? ????.

MySQL ??? ?? ??? ?? ?? ??? ?? ??? ??????. 1. ?? ?? ?? ?? ???? Slow_Query_Log ? Long_Query_Time; 2. ???? ??? ?? ??? ???? ? ????? query_time, lock_time, rows_examined? ?? ?? ??? ???? ????. 3. ??? ????? ???? ?? mysqldumpslow ?? pt-query idigest ??? ??????. 4. ??? ???? ??? ??, ??*???*, ??? ?? ?? ?? ?????. ?? ??, user_id? ???? ???? ?? ? ?? ?? ?? ??? ?? ???? ???? ? ????.

MySQLDump? MySQL ??????? ??? ??? ???? ???? ?????. ??????? ???? ?? ?? ? ?? ?? ???? SQL ??? ?????. 1. ?? ??? ????? ??? ?????? ??? ???? ??? SQL ???? ?????. 2. ??? ?????? ?? ??? ??? ???? TB ?? ???? ?? ???? ???? ????. 3. ???? ???-single transaction,-databases,-all-databases,-routines ?; 4. MySQL ??? ???? ?? ?? ?? ?? ?? ? ??? ?? ??? ???? ? ????. 5. ??? ????? ????? ?? ? ?? ??? ???? ?? ????.

MySQL?? NULL ?? ?? ? ? 1. ???? ?? ? ? ? ??? NotNull? ???? ?? ??? NULL? ?????. 2. iSnull ?? ISNOTNULL = ??! =; 3. Ifnull ?? Coalesce ??? ????? ???? ???? ? ??? ? ????. 4. ?? ?? ????? NULL ?? ?? ??? ?? ???? ??? ?? ? ORM ??? ?? ?? ?????? ??????. NULL? ???? ?? ?? ???? ??? ???? ?? ?? ?? ????. ??? ???? ??, ?? ? ???? ?? ? ??? ?? ??? ??? ?? ???????. ??? ??? ???? ??? ?? ?? ??? ????? ?? ? ????.

MySQL? ?? ????? ?????? ?? ??? ?????. 1. MySQL ?? ??, sudosystemctlstopmysql ?? sudosystemctlstopmysqld? ??????. 2. -skip-grant-tables ???? mysql? ???? sudomysqld-skip-grant-tables &; 3. MySQL? ????? ?? SQL ??? ???? FlushPrivileges; Alteruser'Root '@'localHost'IndifiedBy'Your_new? ?? ??? ?? ????? ??????.
