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cellspacing="1" cellpadding="1" bgcolor="#000000"><tr bgcolor="#FFFFFF"><td width="100%" colspan="4" align="left"><table width="95%" align="center"><tr><td class="font1"><p align="center"><br><font size="3">数据库应用程序开发中图像数据的存取技术</font><br><span class="nava"><font color="#CC9933">2000-06-17· -·中国计算机报</font></span></p><p><br> Delphi提供了数据访问(DataAccess)和数据控制(DataControls)的可视化控件，能够方便快捷地产生具有良好界面且功能强大的数据库应用程序。对于涉及图像数据(含Graphic字段)的数据库应用程序，如人事管理信息系统等，图像数据的存取技术是一个关键。然而，有关Delphi下图象的存取，特别是图像的保存方面的技术各种资料上很少提及。下面，笔者结合一个简单的例子来说明。<br> <br> <strong>一、图像数据的保存</strong><br> 1.创建一个含有Graphic字段的数据库列表。<br> 在WindowsISQ(或Databasedesktop)下create database mydb.gdb</p> <blockquote> <p> create table myfrieds(name varchar(15) notnull，telephone varchar(12)， address varchar(30)，zipvarchar(8)，picture varchar(15)，image blob);</p> </blockquote> <p> 其中，picture字段用于保存图像的名称(包括路径)，image(Graphic字符)则用于存储图像，其数据类型为“blob”。<br> <br> 2.建立窗体(如图1所示)，设置窗体中各控件的属性。<br> <br> 该窗体的主要功能是将某人信息进行编辑和保存。需要注意的图像保存所用的图像框必须用TImage而不能用TDBImage，编辑框宜用Tedit而不宜用TDBEdit，这一点与图像的读取恰好相反。<br> <br> 其中，各主要控件的属性设置如下:<br> Datasource1.Dataset:=table1;<br> Table1.Databasename:=mydb.gdb;<br> Table1.Tablename:=myfriends;<br> Table1.active:=true;<br> 其他诸如Caption之类的属性设置不再叙述。<br> <br> 3.数据处理程序的建立。<br> (1)图像( .bmp文件)打开的处理。<br> procedureTForm1.pictopenbtnClick(Sender:TObject);<br> beginopendialog1.execute;<br> image1.picture.loadfromfile(opendialog1.filename);<br> end;<br> <br> (2)图像保存的处理。<br> 图像保存的处理程序完成把在窗体1所编辑的信息包括图像保存到相应的数据库中，其关键是要定义一个Graphic类型的变量且该变量要用Assign()函数传递到相应数据库中保存。具体程序如下:<br>⌨️ 快捷键说明
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