Get table labels

  import 
  
 ( 
  
 "context" 
  
 "fmt" 
  
 "io" 
  
 "cloud.google.com/go/bigquery" 
 ) 
 // tableLabels demonstrates fetching metadata from a table and printing the Label metadata to an io.Writer. 
 func 
  
 tableLabels 
 ( 
 w 
  
 io 
 . 
 Writer 
 , 
  
 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 
 () 
  
 meta 
 , 
  
 err 
  
 := 
  
 client 
 . 
 Dataset 
 ( 
 datasetID 
 ). 
 Table 
 ( 
 tableID 
 ). 
 Metadata 
 ( 
 ctx 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 err 
  
 } 
  
 fmt 
 . 
 Fprintf 
 ( 
 w 
 , 
  
 "Table %s labels:\n" 
 , 
  
 datasetID 
 ) 
  
 if 
  
 len 
 ( 
 meta 
 . 
 Labels 
 ) 
  
 == 
  
 0 
  
 { 
  
 fmt 
 . 
 Fprintln 
 ( 
 w 
 , 
  
 "Table has no labels defined." 
 ) 
  
 return 
  
 nil 
  
 } 
  
 for 
  
 k 
 , 
  
 v 
  
 := 
  
 range 
  
 meta 
 . 
 Labels 
  
 { 
  
 fmt 
 . 
 Fprintf 
 ( 
 w 
 , 
  
 "\t%s:%s\n" 
 , 
  
 k 
 , 
  
 v 
 ) 
  
 } 
  
 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 
 
 ; 
 import 
  
 com.google.cloud.bigquery. TableId 
 
 ; 
 // Sample to get table labels 
 public 
  
 class 
 GetTableLabels 
  
 { 
  
 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" 
 ; 
  
 getTableLabels 
 ( 
 datasetName 
 , 
  
 tableName 
 ); 
  
 } 
  
 public 
  
 static 
  
 void 
  
 getTableLabels 
 ( 
 String 
  
 datasetName 
 , 
  
 String 
  
 tableName 
 ) 
  
 { 
  
 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 
 (); 
  
 // This example table starts with existing label { color: 'green' } 
  
  Table 
 
  
 table 
  
 = 
  
 bigquery 
 . 
  getTable 
 
 ( 
 TableId 
 . 
 of 
 ( 
 datasetName 
 , 
  
 tableName 
 )); 
  
 table 
  
 . 
 getLabels 
 () 
  
 . 
 forEach 
 (( 
 key 
 , 
  
 value 
 ) 
  
 - 
>  
 System 
 . 
 out 
 . 
 println 
 ( 
 "Retrieved labels successfully" 
 )); 
  
 } 
  
 catch 
  
 ( 
  BigQueryException 
 
  
 e 
 ) 
  
 { 
  
 System 
 . 
 out 
 . 
 println 
 ( 
 "Label was not deleted. \n" 
  
 + 
  
 e 
 . 
 toString 
 ()); 
  
 } 
  
 } 
 } 
 

  // Import the Google Cloud client library 
 const 
  
 { 
 BigQuery 
 } 
  
 = 
  
 require 
 ( 
 ' @google-cloud/bigquery 
' 
 ); 
 const 
  
 bigquery 
  
 = 
  
 new 
  
  BigQuery 
 
 (); 
 async 
  
 function 
  
 getTableLabels 
 () 
  
 { 
  
 // Gets labels on a dataset. 
  
 /** 
 * TODO(developer): Uncomment the following lines before running the sample. 
 */ 
  
 // const datasetId = "my_dataset"; 
  
 // const tableId = "my_table"; 
  
 // Retrieve current dataset metadata. 
  
 const 
  
 table 
  
 = 
  
 bigquery 
 . 
 dataset 
 ( 
 datasetId 
 ). 
 table 
 ( 
 tableId 
 ); 
  
 const 
  
 [ 
 metadata 
 ] 
  
 = 
  
 await 
  
 table 
 . 
 getMetadata 
 (); 
  
 const 
  
 labels 
  
 = 
  
 metadata 
 . 
 labels 
 ; 
  
 console 
 . 
 log 
 ( 
 ` 
 ${ 
 tableId 
 } 
 Labels:` 
 ); 
  
 for 
  
 ( 
 const 
  
 [ 
 key 
 , 
  
 value 
 ] 
  
 of 
  
 Object 
 . 
 entries 
 ( 
 labels 
 )) 
  
 { 
  
 console 
 . 
 log 
 ( 
 ` 
 ${ 
 key 
 } 
 : 
 ${ 
 value 
 } 
 ` 
 ); 
  
 } 
 } 
 getTableLabels 
 (); 
 

  from 
  
 google.cloud 
  
 import 
  bigquery 
 
 client 
 = 
  bigquery 
 
 . 
  Client 
 
 () 
 # TODO(dev): Change table_id to the full name of the table you want to create. 
 table_id 
 = 
 "your-project.your_dataset.your_table_name" 
 table 
 = 
 client 
 . 
  get_table 
 
 ( 
 table_id 
 ) 
 # API Request 
 # View table labels 
 print 
 ( 
 f 
 "Table ID: 
 { 
 table_id 
 } 
 ." 
 ) 
 if 
 table 
 . 
 labels 
 : 
 for 
 label 
 , 
 value 
 in 
 table 
 . 
 labels 
 . 
  items 
 
 (): 
 print 
 ( 
 f 
 " 
 \t 
 { 
 label 
 } 
 : 
 { 
  value 
 
 } 
 " 
 ) 
 else 
 : 
 print 
 ( 
 " 
 \t 
 Table has no labels defined." 
 )