# QueryDefinition
<a name="API_QueryDefinition"></a>

This structure contains details about a saved CloudWatch Logs Insights query definition.

## Contents
<a name="API_QueryDefinition_Contents"></a>

 ** lastModified **   <a name="CWL-Type-QueryDefinition-lastModified"></a>
The date that the query definition was most recently modified.  
Type: Long  
Valid Range: Minimum value of 0.  
Required: No

 ** logGroupNames **   <a name="CWL-Type-QueryDefinition-logGroupNames"></a>
If this query definition contains a list of log groups that it is limited to, that list appears here.  
Type: Array of strings  
Length Constraints: Minimum length of 1. Maximum length of 512.  
Pattern: `[\.\-_/#A-Za-z0-9]+`   
Required: No

 ** name **   <a name="CWL-Type-QueryDefinition-name"></a>
The name of the query definition.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 255.  
Required: No

 ** parameters **   <a name="CWL-Type-QueryDefinition-parameters"></a>
If this query definition contains a list of query parameters that define placeholder variables for the query string, that list appears here.  
Type: Array of [QueryParameter](API_QueryParameter.md) objects  
Array Members: Maximum number of 20 items.  
Required: No

 ** queryDefinitionId **   <a name="CWL-Type-QueryDefinition-queryDefinitionId"></a>
The unique ID of the query definition.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 256.  
Required: No

 ** queryLanguage **   <a name="CWL-Type-QueryDefinition-queryLanguage"></a>
The query language used for this query. For more information about the query languages that CloudWatch Logs supports, see [Supported query languages](https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/CWL_AnalyzeLogData_Languages.html).  
Type: String  
Valid Values: `CWLI | SQL | PPL`   
Required: No

 ** queryString **   <a name="CWL-Type-QueryDefinition-queryString"></a>
The query string to use for this definition. For more information, see [CloudWatch Logs Insights Query Syntax](https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/CWL_QuerySyntax.html).  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 10000.  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/logs-2014-03-28/QueryDefinition) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/logs-2014-03-28/QueryDefinition) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/logs-2014-03-28/QueryDefinition)