Document for sys_guid function.

Author: bigplaice

CN/modules/ROOT/nav.adoc

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 **** xref:master/6.3.7.adoc[嵌套子函数]
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 **** xref:master/6.3.9.adoc[大小写转换]
+**** xref:master/6.3.10.adoc[sys_guid 函数]
 *** xref:master/6.4.adoc[国标GB18030]
 *** 内置函数
 **** xref:master/6.4.1.adoc[sys_context]
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 *** xref:master/7.17.adoc[17、NLS 参数]
 *** xref:master/7.18.adoc[18、Force View]
 *** xref:master/7.19.adoc[19、嵌套子函数]
+*** xref:master/7.20.adoc[20、sys_guid 函数]
 ** IvorySQL贡献指南
 *** xref:master/8.1.adoc[社区贡献指南]
 *** xref:master/8.2.adoc[asciidoc语法快速参考]

CN/modules/ROOT/pages/master/6.3.10.adoc

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+= sys_guid() 函数
+
+== 目的
+
+IvorySQL的sys_guid() 是一个强大的随机数产生函数，它产生并返回一个由16个字节组成的数据库级别唯一的标识符(原始值)。
+
+== 实现说明
+
+IvorySQL的sys_guid()函数通过修改插件uuid-ossp的代码实现。为了充分利用uuid的多种基础库，采用如下逻辑：
+
+1. 如果系统有uuid-ossp，就使用uuid_make();
+2. 如果系统有uuid-e2fs，就使用 uuid_generate_random();
+3. 否则就调用 arc4random();
+
+同时修改代码使得IvorySQL能够自动载入uuid-ossp插件。
+

CN/modules/ROOT/pages/master/7.20.adoc

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+:sectnums:
+:sectnumlevels: 5
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+= sys_guid() 函数
+
+== 目的
+
+IvorySQL的sys_guid() 是一个强大的随机数产生函数，它产生并返回一个由16个字节组成的数据库级别唯一的标识符(原始值)。
+
+== 使用示例
+
+```
+highgo=# select sys_guid() from dual;
+              sys_guid              
+------------------------------------
+ \x3ed9426c8a093442a38bea09a74f44a1
+(1 row)
+```
+
+== sys_guid函数在建表时可以作为主键
+
+```
+create table student
+(
+student_id raw(16) default sys_guid() primary key,
+student_name varchar2(100) not null
+);
+```
+
+== 新增数据时自动填充主键
+
+```
+insert into student(student_name) values ('Steven');
+```

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+*** xref:master/6.3.10.adoc[sys_guid Function]
 ** xref:master/6.4.adoc[GB18030 Character Set]
 ** Built-in Functions
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 ** xref:master/7.17.adoc[17、NLS Parameters]
 ** xref:master/7.18.adoc[18、Force View]
 ** xref:master/7.19.adoc[19、Nested Subfunctions]
+** xref:master/7.20.adoc[20、sys_guid Function]
 * xref:master/8.adoc[Community contribution]
 * xref:master/9.adoc[Tool Reference]
 * xref:master/10.adoc[FAQ]

EN/modules/ROOT/pages/master/6.3.10.adoc

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+= sys_guid() function
+
+== Purpose
+
+IvorySQL's sys_guid() is a powerful random number generation function that generates and returns a 16-byte database-level unique identifier (raw value).
+
+== Implementation Description
+
+The sys_guid() function of IvorySQL is implemented by modifying the code of the uuid-ossp plugin. To make full use of various underlying libraries of uuid, the following logic is adopted:
+
+1. If the uuid-ossp exists in the system, uuid_make() will be used;
+2. If the uuid-e2fs exists in the system, uuid_generate_random() will be used；
+3. Otherwise use arc4random()；
+
+Meanwhile modify the code so that IvorySQL can load uuid-ossp extension automatically.
+

EN/modules/ROOT/pages/master/7.20.adoc

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+:sectnums:
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+:imagesdir: ./_images
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+= sys_guid() function
+
+== Purpose
+
+IvorySQL's sys_guid() is a powerful random number generation function that generates and returns a 16-byte database-level unique identifier (raw value).
+
+== Usage example
+
+```
+highgo=# select sys_guid() from dual;
+              sys_guid              
+------------------------------------
+ \x3ed9426c8a093442a38bea09a74f44a1
+(1 row)
+```
+
+== The sys_guid function can generate default values for primary keys when creating a table
+
+```
+create table student
+(
+student_id raw(16) default sys_guid() primary key,
+student_name varchar2(100) not null
+);
+```
+
+== The primary key is automatically populated when new data is added
+
+```
+insert into student(student_name) values ('Steven');
+```