PeopleSoft 开发 - 01 People Code 语法基础

PeopleCode 语言结构

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数据类型

常规数据类型包括 number,date,string.可以进行基本计算。

Object 数据类型用于实例化。

在使用变量前要先声明。

常规数据类型：

• Any 没有声明类型的默认为 ANY类型，由系统自动判断类型
• Boolean
• Date
• DateTime
• Float
• Integer   
   -2,147,483,648 到 2,147,483,647
• Number
• Object
• String
• Time

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注释

• /* This is commont */ 
• REM (remark)
• <* /* This is commont */  *>     可以嵌套别的注释符号

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语句

以分号(;)结尾

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赋值语句

根据数据类型，判断是传值还是传引用，

基本类型数据一般是传值，对象类型是传引用。

Local array of number &AN, &AN2; Local number #  &AN = CreateArray(100, 200, 300); &AN2 = &AN; &NUM = &AN[1];

上面代码中 &AN和&AN2指向同一个对象

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分支语句

If condition Then    [statement_list_1] [Else    [statement_list_2]] End-if;

evaluate &USE_FREQUENCYwhen = "never"    PROD_USE_FREQ = 0;   Break;when = "sometimes"    PROD_USE_FREQ = 1;   Break;when = "frequently"    PROD_USE_FREQ = 2;   Break;when-other   Error "Unexpected value assigned to &USE_FREQUENCY."end-evaluate;

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For 语句

&MAX = 10;for &COUNT = 1 to &MAX;   WinMessage("Executing statement list, count = " | &COUNT);end-for;

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Repeat

statement_list

Until logical_expression;

反复运行直到 logical_expression返回TRUE；

While logical_expression

statement_ list

End-while;

反复运行直到 logical_expression返回FALSE；

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常量

Constant &Start_New_Instance = True; Constant &Display_Mode = 0; Constant &AddMode = "A": Local Field &Start_Date; . . . MyFunction(&Start_New_Instance, &Display_Mode, &Add_Mode);

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meta-SQL

特殊的SQL对象，用%表示。

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变量

以  & 开头。

Local Number &AGE; Global String &OPER_NICKNAME; Component Rowset &MY_ROWSET; Local Any &SOME_FIELD; Local ApiObject &MYTREE; Local Boolean &Compare = True;

通常不使用Global范围的变量，因为很难维护。

在使用 TransferPage, DoModal, or DoModalComponent 方法后 Component 范围变量可以保持使用，但是在调用 Transfer 方法后，Component 范围变量就无效了。

下面类型的变量只能声明为Local：

• JavaObject

• Interlink

  Note. Interlink objects can be declared as type Global in an Application Engine program.

• TransformData

• XmlNode

下面ApiObject 类型的变量只能声明为Global：

• Session

• PSMessages collection

• PSMessage

• All tree classes (trees, tree structures, nodes, levels, and so on.)

• Query classes

All other ApiObject data type objects (such as all the PortalRegistry classes) must be declared as Local.

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操作符

• +

• -

• *

• /

• **

Time + number of seconds

Time

Resulting time

Date + number of days

Date

Resulting date

Date - date

Number

Difference in days

Time - time

Number

Difference in seconds

Date + time

DateTime

Date and time combined

字符串之间用 | 符号链接。

&RETORT = "I can't do that, " | &OPER_NICKNAME |  "."

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@ 操作符（类似指针）

使用@操作符，可以达到类似指针的效果：

&STR1 = "RECORD.BUS_EXPENSE_PER"; &STR2 = "BUS_EXPENSE_DTL.EMPLID"; &STR3 = FetchValue(@(&STR1), CurrentRowNumber(1), @(&STR2), 1); WinMessage(&STR3, 64); 

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=

Equal

!=

Not equal

<>

Not equal

<

Less than

<=

Less than or equal to

>

Greater than

>=

Greater than or equal to