Update a table description

  import 
  
 ( 
  
 "context" 
  
 "fmt" 
  
 "cloud.google.com/go/bigquery" 
 ) 
 // updateTableDescription demonstrates how to fetch a table's metadata and updates the Description metadata. 
 func 
  
 updateTableDescription 
 ( 
 projectID 
 , 
  
 datasetID 
 , 
  
 tableID 
  
 string 
 ) 
  
 error 
  
 { 
  
 // projectID := "my-project-id" 
  
 // datasetID := "mydataset" 
  
 // tableID := "mytable" 
  
 ctx 
  
 := 
  
 context 
 . 
 Background 
 () 
  
 client 
 , 
  
 err 
  
 := 
  
 bigquery 
 . 
 NewClient 
 ( 
 ctx 
 , 
  
 projectID 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 fmt 
 . 
 Errorf 
 ( 
 "bigquery.NewClient: %w" 
 , 
  
 err 
 ) 
  
 } 
  
 defer 
  
 client 
 . 
 Close 
 () 
  
 tableRef 
  
 := 
  
 client 
 . 
 Dataset 
 ( 
 datasetID 
 ). 
 Table 
 ( 
 tableID 
 ) 
  
 meta 
 , 
  
 err 
  
 := 
  
 tableRef 
 . 
 Metadata 
 ( 
 ctx 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 err 
  
 } 
  
 update 
  
 := 
  
 bigquery 
 . 
  TableMetadataToUpdate 
 
 { 
  
 Description 
 : 
  
 "Updated description." 
 , 
  
 } 
  
 if 
  
 _ 
 , 
  
 err 
  
 = 
  
 tableRef 
 . 
 Update 
 ( 
 ctx 
 , 
  
 update 
 , 
  
 meta 
 . 
 ETag 
 ); 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 err 
  
 } 
  
 return 
  
 nil 
 } 
 

  import 
  
 com.google.cloud.bigquery. BigQuery 
 
 ; 
 import 
  
 com.google.cloud.bigquery. BigQueryException 
 
 ; 
 import 
  
 com.google.cloud.bigquery. BigQueryOptions 
 
 ; 
 import 
  
 com.google.cloud.bigquery. Table 
 
 ; 
 public 
  
 class 
 UpdateTableDescription 
  
 { 
  
 public 
  
 static 
  
 void 
  
 main 
 ( 
 String 
 [] 
  
 args 
 ) 
  
 { 
  
 // TODO(developer): Replace these variables before running the sample. 
  
 String 
  
 datasetName 
  
 = 
  
 "MY_DATASET_NAME" 
 ; 
  
 String 
  
 tableName 
  
 = 
  
 "MY_TABLE_NAME" 
 ; 
  
 String 
  
 newDescription 
  
 = 
  
 "this is the new table description" 
 ; 
  
 updateTableDescription 
 ( 
 datasetName 
 , 
  
 tableName 
 , 
  
 newDescription 
 ); 
  
 } 
  
 public 
  
 static 
  
 void 
  
 updateTableDescription 
 ( 
  
 String 
  
 datasetName 
 , 
  
 String 
  
 tableName 
 , 
  
 String 
  
 newDescription 
 ) 
  
 { 
  
 try 
  
 { 
  
 // Initialize client that will be used to send requests. This client only needs to be created 
  
 // once, and can be reused for multiple requests. 
  
  BigQuery 
 
  
 bigquery 
  
 = 
  
  BigQueryOptions 
 
 . 
 getDefaultInstance 
 (). 
 getService 
 (); 
  
  Table 
 
  
 table 
  
 = 
  
 bigquery 
 . 
  getTable 
 
 ( 
 datasetName 
 , 
  
 tableName 
 ); 
  
 bigquery 
 . 
  update 
 
 ( 
 table 
 . 
 toBuilder 
 (). 
 setDescription 
 ( 
 newDescription 
 ). 
 build 
 ()); 
  
 System 
 . 
 out 
 . 
 println 
 ( 
 "Table description updated successfully to " 
  
 + 
  
 newDescription 
 ); 
  
 } 
  
 catch 
  
 ( 
  BigQueryException 
 
  
 e 
 ) 
  
 { 
  
 System 
 . 
 out 
 . 
 println 
 ( 
 "Table description was not updated \n" 
  
 + 
  
 e 
 . 
 toString 
 ()); 
  
 } 
  
 } 
 } 
 

  // Import the Google Cloud client library 
 const 
  
 { 
 BigQuery 
 } 
  
 = 
  
 require 
 ( 
 ' @google-cloud/bigquery 
' 
 ); 
 const 
  
 bigquery 
  
 = 
  
 new 
  
  BigQuery 
 
 (); 
 async 
  
 function 
  
 updateTableDescription 
 () 
  
 { 
  
 // Updates a table's description. 
  
 // Retreive current table metadata 
  
 const 
  
 table 
  
 = 
  
 bigquery 
 . 
 dataset 
 ( 
 datasetId 
 ). 
 table 
 ( 
 tableId 
 ); 
  
 const 
  
 [ 
 metadata 
 ] 
  
 = 
  
 await 
  
 table 
 . 
 getMetadata 
 (); 
  
 // Set new table description 
  
 const 
  
 description 
  
 = 
  
 'New table description.' 
 ; 
  
 metadata 
 . 
 description 
  
 = 
  
 description 
 ; 
  
 const 
  
 [ 
 apiResponse 
 ] 
  
 = 
  
 await 
  
 table 
 . 
 setMetadata 
 ( 
 metadata 
 ); 
  
 const 
  
 newDescription 
  
 = 
  
 apiResponse 
 . 
 description 
 ; 
  
 console 
 . 
 log 
 ( 
 ` 
 ${ 
 tableId 
 } 
 description: 
 ${ 
 newDescription 
 } 
 ` 
 ); 
 } 
 

  # from google.cloud import bigquery 
 # client = bigquery.Client() 
 # project = client.project 
 # dataset_ref = bigquery.DatasetReference(project, dataset_id) 
 # table_ref = dataset_ref.table('my_table') 
 # table = client.get_table(table_ref)  # API request 
 assert 
 table 
 . 
 description 
 == 
 "Original description." 
 table 
 . 
 description 
 = 
 "Updated description." 
 table 
 = 
 client 
 . 
 update_table 
 ( 
 table 
 , 
 [ 
 "description" 
 ]) 
 # API request 
 assert 
 table 
 . 
 description 
 == 
 "Updated description."