Parameter
Последнее обновление
21 мая 2021 г.
Description
Gets metadata (such as the methods, properties, and parameters of a component) associated with an object that is deployed on the ColdFusion server.
Returns
Structured metadata information: for ColdFusion components (CFCs) and user-defined functions (UDFs), a structure; for query objects, an array of structures.
Category
Function syntax
GetMetaData(object)
See also
History
ColdFusion (2018 release) Update 5:
- Array.getmetadata() returns a struct that includes a new key, dimensions.
- The key, datatype, produces a fully qualified path of the component if the data type of the array is a component.
ColdFusion MX 7: Added support for getting query object metadata.
ColdFusion MX: Added this function.
Parameters
|
|
Description |
|---|---|
|
object |
A ColdFusion component, user-defined function, or query object. Within a CFC, the parameter can also specify the This scope. |
Usage
This function provides information about application data, and lets applications dynamically determine the structure of an object and how to use it. This function is useful for CFCs and query objects. The metadata for a CFC includes information on the component and its functions, arguments, and properties. The getMetaData function also returns metadata for user-defined functions that are not part of CFCs. Use the GetComponentMetaData function to get information about ColdFusion interfaces, or about CFC definitions that you have not instantiated.The following table lists the data returned by the function for supported object types:
| Object | Field | Description |
|---|---|---|
| Component | displayname | Value of the cfcomponent tag displayname attribute, if any. |
| extends | Metadata for the component’s ancestor component. Components that do not explicitly extend another component extend the WEB-INF.cftags.component. | |
| fullname |
The dot-delimited path from the cf_webroot of the component. | |
| functions |
Array of metadata structures for the component’s functions. | |
| hint |
Value of the cfcomponent tag displayname attribute, if any. | |
| implements |
A structure containing the metadata of the interfaces that the component implements. The key of the structure is the interface name, and the value is a structure containing the interface metadata. | |
| name |
Component name, including the period-delimited path from a component search root such as the web root or a directory specified in the administrator Custom Tag Paths page. | |
| output |
Value of the cfcomponent tag output attribute, if any | |
| path | Absolute path to the component. | |
| properties |
Array of structures containing metadata specified by the component’s cfproperty tags, if any. | |
| type |
Always, component. | |
| userMetadata |
User-specified attributes in the cfcomponent tag | |
| function | access | Value of the cffunction tag access attribute, if any. |
| displayname |
Value of the cffunction tag displayname attribute, if any. | |
| hint |
Value of the cffunction tag hint attribute, if any. | |
| name |
Function name. | |
| output |
Value of the cffunction tag output attribute, if any. | |
| parameters | Array of structures containing metadata for the function parameters. | |
| returnformat | The format in which to return values to a remote caller. This attribute has no effect on values returned to a local caller. | |
| returntype |
Value of the cffunction tag returntype attribute, if any. | |
| roles | Value of the cffunction tag output attribute, if any. | |
| userMetadata | User-specified attributes in the cffunction tag. | |
| Parameter or Property | default | Value of the cfargument or cfproperty tag default attribute, if any. |
| displayname | Value of the cffunction tag displayname attribute, if any. | |
| hint | Value of the cfargument or cfproperty tag hint attribute, if any. | |
| name | Function parameter or CFC property name. | |
| required | Value of the cfargument or cfproperty tag required attribute , if any. | |
| type | Value of the cfargument or cfproperty tag type attribute, if any. | |
| userMetadata | User-specified attributes in the argument tag. | |
| Query | IsCaseSensitive | Boolean value indicating whether character data must be case correct. |
| name |
The column name. | |
TypeName |
The SQL data type (Omitted if the query object is created with QueryNew without specifying types.) |
Note: Use the This scope to access component metadata inside the CFC. The This scope is available at runtime in the component body and in the CFC methods. It is used to read and write variables that are present during the life of the component. |
For more information, see Using introspection to get information about components in the Developing ColdFusion Applications.
Example
The following example uses the cfdump tag to display metadata for the utilities CFC that is used by the ColdFusion component browser. It also displays the names and data types of the fields in the cfdocexamples database Employees table.
<!--- Create an instance of the Component Explorer utilities CFC.
and get its metadata --->
<cfscript>
componentutils = createObject("component", "cfide.componentutils.utils");
utilmetadata = getMetaData(componentutils);
</cfscript>
<h4>Metadata for the CFC component utilities</h4>
<cfdump var="#utilmetadata#">
<!--- use GetMetadata to get the names and data types of the fields in the
cfdocexamples Employees table --->
<cfquery name="getemployees" datasource="cfdocexamples">
SELECT *
FROM Employees
</cfquery>
<cfset employeemeta=getMetaData(getemployees)>
<h4>The Employees table has the following columns</h4>
<cfloop index="i" from="1" to="#arrayLen(employeemeta)#">
<cfoutput>
#employeemeta[i].name# #employeemeta[i].TypeName# #employeemeta[i].isCaseSensitive#<br>
</cfoutput>
</cfloop>
Adobe MAX
— творческая конференция
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Adobe MAX
Творческая конференция
С 14 по 16 октября очно в Майами-Бич и онлайн