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<p style='layout-grid-mode:char'>1.1.2<span
style='mso-spacerun:yes'> Oracle8<span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>支持面向对象</p>
<p style='layout-grid-mode:char'><span
style='mso-spacerun:yes'> Oracle8<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>的面向对象特征将面向对象的对象引入到关系型数据库中，使Oracle8<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>成为</p>
<p style='layout-grid-mode:char'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>混合型的，或对象—关系型数据库。</p>
<p style='layout-grid-mode:char'><span
style='mso-spacerun:yes'> <span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>作为对象—关系型数据库，Oracle8<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>支持所有已熟知的关系数据库概念，如：表、列、</p>
<p style='layout-grid-mode:char'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>行和关系。它同时也支持而问对象特征：类型、方法和属性的子集。在严格的面向对象</p>
<p style='layout-grid-mode:char'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>数据库中还有许多其他特征，它们也将在Oracle8<span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>今后的版本中逐渐成为其一部分。目前，</p>
<p style='layout-grid-mode:char'>Oracle8<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>中现有的面向对象特征仅能让你得以初步了解。</p>
<p style='layout-grid-mode:char'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>以下是主要面向对象特征的快速列表：</p>
<p style='layout-grid-mode:char'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>●<span style='mso-spacerun:yes'> <span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>对象类型。使用对象类型来创建客户化的数据类型，你可在对象表格中使用这</p>
<p style='layout-grid-mode:char'><span
style='mso-spacerun:yes'> <span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>些新类型代替以前定义的数据类型(<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>如DATE<span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>或VARCHAR2)<span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。</p>
<p style='layout-grid-mode:char'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>●<span style='mso-spacerun:yes'> <span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>对象视图。使用对象视图在关系型表格中存贮数据并使用对象技术来访问它们。</p>
<p style='layout-grid-mode:char'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>●<span style='mso-spacerun:yes'> <span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>对象扩展。使用<span class=SpellE>sQL<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>和PL/SQL <span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>中的新命令来操纵并定义对象。这些新的命令</p>
<p style='layout-grid-mode:char'><span
style='mso-spacerun:yes'> <span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>与新的面向对象SQL<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>标难兼容<span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。</p>
<p style='layout-grid-mode:char'>1<span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>．1<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>．3<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>增强的工具集</p>
<p style='layout-grid-mode:char'><span
style='mso-spacerun:yes'> <span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>本节所描述的新的实用程序特征增强了DBA<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，系统管理员和设计者的工具集。</p>
<p style='layout-grid-mode:char'><span
style='mso-spacerun:yes'> <span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>附加的作为Oracle8<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>套件标准部分的Enterprise Manager<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>是DBA<span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>和数据库设计者可用</p>
<p style='layout-grid-mode:char'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>工具的杰出改进工具。第<span lang=EN-US style='font-family:"Times New Roman"'>2章将简要描述每个部件，这些部件还将在本书的其他章节出</p>
<p style='layout-grid-mode:char'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>现。Enterprise Manager<span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>包括以下部件：</p>
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<p style='layout-grid-mode:char'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>●<span style='mso-spacerun:yes'> <span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>存储管理器（Storage
Manager<span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>）</p>
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