Copy a single-source table

Copy a single-source table to a given destination.

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For detailed documentation that includes this code sample, see the following:

Code sample

C#

Before trying this sample, follow the C# setup instructions in the BigQuery quickstart using client libraries . For more information, see the BigQuery C# API reference documentation .

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries .

  using 
  
 Google.Apis.Bigquery.v2.Data 
 ; 
 using 
  
  Google.Cloud.BigQuery.V2 
 
 ; 
 using 
  
 System 
 ; 
 public 
  
 class 
  
 BigQueryCopyTable 
 { 
  
 public 
  
 void 
  
 CopyTable 
 ( 
  
 string 
  
 projectId 
  
 = 
  
 "your-project-id" 
 , 
  
 string 
  
 destinationDatasetId 
  
 = 
  
 "your_dataset_id" 
  
 ) 
  
 { 
  
  BigQueryClient 
 
  
 client 
  
 = 
  
  BigQueryClient 
 
 . 
  Create 
 
 ( 
 projectId 
 ); 
  
 TableReference 
  
 sourceTableRef 
  
 = 
  
 new 
  
 TableReference 
 () 
  
 { 
  
 TableId 
  
 = 
  
 "shakespeare" 
 , 
  
 DatasetId 
  
 = 
  
 "samples" 
 , 
  
 ProjectId 
  
 = 
  
 "bigquery-public-data" 
  
 }; 
  
 TableReference 
  
 destinationTableRef 
  
 = 
  
 client 
 . 
  GetTableReference 
 
 ( 
  
 destinationDatasetId 
 , 
  
 "destination_table" 
 ); 
  
  BigQueryJob 
 
  
 job 
  
 = 
  
 client 
 . 
  CreateCopyJob 
 
 ( 
  
 sourceTableRef 
 , 
  
 destinationTableRef 
 ) 
  
 . 
  PollUntilCompleted 
 
 () 
  
 // Wait for the job to complete. 
  
 . 
 ThrowOnAnyError 
 (); 
  
 // Retrieve destination table 
  
  BigQueryTable 
 
  
 destinationTable 
  
 = 
  
 client 
 . 
  GetTable 
 
 ( 
 destinationTableRef 
 ); 
  
 Console 
 . 
 WriteLine 
 ( 
  
 $"Copied {destinationTable. Resource 
.NumRows} rows from table " 
  
 + 
  
 $"{sourceTableRef.DatasetId}.{sourceTableRef.TableId} " 
  
 + 
  
 $"to {destinationTable. FullyQualifiedId 
}." 
  
 ); 
  
 } 
 } 
 

Go

Before trying this sample, follow the Go setup instructions in the BigQuery quickstart using client libraries . For more information, see the BigQuery Go API reference documentation .

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries .

  import 
  
 ( 
  
 "context" 
  
 "fmt" 
  
 "cloud.google.com/go/bigquery" 
 ) 
 // copyTable demonstrates copying a table from a source to a destination, and 
 // allowing the copy to overwrite existing data by using truncation. 
 func 
  
 copyTable 
 ( 
 projectID 
 , 
  
 datasetID 
 , 
  
 srcID 
 , 
  
 dstID 
  
 string 
 ) 
  
 error 
  
 { 
  
 // projectID := "my-project-id" 
  
 // datasetID := "mydataset" 
  
 // srcID := "sourcetable" 
  
 // dstID := "destinationtable" 
  
 ctx 
  
 := 
  
 context 
 . 
 Background 
 () 
  
 client 
 , 
  
 err 
  
 := 
  
 bigquery 
 . 
 NewClient 
 ( 
 ctx 
 , 
  
 projectID 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 fmt 
 . 
 Errorf 
 ( 
 "bigquery.NewClient: %w" 
 , 
  
 err 
 ) 
  
 } 
  
 defer 
  
 client 
 . 
 Close 
 () 
  
 dataset 
  
 := 
  
 client 
 . 
 Dataset 
 ( 
 datasetID 
 ) 
  
 copier 
  
 := 
  
 dataset 
 . 
 Table 
 ( 
 dstID 
 ). 
  CopierFrom 
 
 ( 
 dataset 
 . 
 Table 
 ( 
 srcID 
 )) 
  
 copier 
 . 
 WriteDisposition 
  
 = 
  
 bigquery 
 . 
  WriteTruncate 
 
  
 job 
 , 
  
 err 
  
 := 
  
 copier 
 . 
 Run 
 ( 
 ctx 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 err 
  
 } 
  
 status 
 , 
  
 err 
  
 := 
  
 job 
 . 
 Wait 
 ( 
 ctx 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 err 
  
 } 
  
 if 
  
 err 
  
 := 
  
 status 
 . 
  Err 
 
 (); 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 err 
  
 } 
  
 return 
  
 nil 
 } 
 

Java

Before trying this sample, follow the Java setup instructions in the BigQuery quickstart using client libraries . For more information, see the BigQuery Java API reference documentation .

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries .

  import 
  
 com.google.cloud.bigquery. BigQuery 
 
 ; 
 import 
  
 com.google.cloud.bigquery. BigQueryException 
 
 ; 
 import 
  
 com.google.cloud.bigquery. BigQueryOptions 
 
 ; 
 import 
  
 com.google.cloud.bigquery. CopyJobConfiguration 
 
 ; 
 import 
  
 com.google.cloud.bigquery. Job 
 
 ; 
 import 
  
 com.google.cloud.bigquery. JobInfo 
 
 ; 
 import 
  
 com.google.cloud.bigquery. TableId 
 
 ; 
 public 
  
 class 
 CopyTable 
  
 { 
  
 public 
  
 static 
  
 void 
  
 main 
 ( 
 String 
 [] 
  
 args 
 ) 
  
 { 
  
 // TODO(developer): Replace these variables before running the sample. 
  
 String 
  
 destinationDatasetName 
  
 = 
  
 "MY_DESTINATION_DATASET_NAME" 
 ; 
  
 String 
  
 destinationTableId 
  
 = 
  
 "MY_DESTINATION_TABLE_NAME" 
 ; 
  
 String 
  
 sourceDatasetName 
  
 = 
  
 "MY_SOURCE_DATASET_NAME" 
 ; 
  
 String 
  
 sourceTableId 
  
 = 
  
 "MY_SOURCE_TABLE_NAME" 
 ; 
  
 copyTable 
 ( 
 sourceDatasetName 
 , 
  
 sourceTableId 
 , 
  
 destinationDatasetName 
 , 
  
 destinationTableId 
 ); 
  
 } 
  
 public 
  
 static 
  
 void 
  
 copyTable 
 ( 
  
 String 
  
 sourceDatasetName 
 , 
  
 String 
  
 sourceTableId 
 , 
  
 String 
  
 destinationDatasetName 
 , 
  
 String 
  
 destinationTableId 
 ) 
  
 { 
  
 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 
 (); 
  
  TableId 
 
  
 sourceTable 
  
 = 
  
  TableId 
 
 . 
 of 
 ( 
 sourceDatasetName 
 , 
  
 sourceTableId 
 ); 
  
  TableId 
 
  
 destinationTable 
  
 = 
  
  TableId 
 
 . 
 of 
 ( 
 destinationDatasetName 
 , 
  
 destinationTableId 
 ); 
  
 // For more information on CopyJobConfiguration see: 
  
 // https://googleapis.dev/java/google-cloud-clients/latest/com/google/cloud/bigquery/JobConfiguration.html 
  
  CopyJobConfiguration 
 
  
 configuration 
  
 = 
  
  CopyJobConfiguration 
 
 . 
 newBuilder 
 ( 
 destinationTable 
 , 
  
 sourceTable 
 ). 
 build 
 (); 
  
 // For more information on Job see: 
  
 // https://googleapis.dev/java/google-cloud-clients/latest/index.html?com/google/cloud/bigquery/package-summary.html 
  
  Job 
 
  
 job 
  
 = 
  
 bigquery 
 . 
  create 
 
 ( 
 JobInfo 
 . 
 of 
 ( 
 configuration 
 )); 
  
 // Blocks until this job completes its execution, either failing or succeeding. 
  
  Job 
 
  
 completedJob 
  
 = 
  
 job 
 . 
  waitFor 
 
 (); 
  
 if 
  
 ( 
 completedJob 
  
 == 
  
 null 
 ) 
  
 { 
  
 System 
 . 
 out 
 . 
 println 
 ( 
 "Job not executed since it no longer exists." 
 ); 
  
 return 
 ; 
  
 } 
  
 else 
  
 if 
  
 ( 
 completedJob 
 . 
 getStatus 
 (). 
 getError 
 () 
  
 != 
  
 null 
 ) 
  
 { 
  
 System 
 . 
 out 
 . 
 println 
 ( 
  
 "BigQuery was unable to copy table due to an error: \n" 
  
 + 
  
 job 
 . 
 getStatus 
 (). 
 getError 
 ()); 
  
 return 
 ; 
  
 } 
  
 System 
 . 
 out 
 . 
 println 
 ( 
 "Table copied successfully." 
 ); 
  
 } 
  
 catch 
  
 ( 
  BigQueryException 
 
  
 | 
  
 InterruptedException 
  
 e 
 ) 
  
 { 
  
 System 
 . 
 out 
 . 
 println 
 ( 
 "Table copying job was interrupted. \n" 
  
 + 
  
 e 
 . 
 toString 
 ()); 
  
 } 
  
 } 
 } 
 

Node.js

Before trying this sample, follow the Node.js setup instructions in the BigQuery quickstart using client libraries . For more information, see the BigQuery Node.js API reference documentation .

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries .

  // Import the Google Cloud client library and create a client 
 const 
  
 { 
 BigQuery 
 } 
  
 = 
  
 require 
 ( 
 ' @google-cloud/bigquery 
' 
 ); 
 const 
  
 bigquery 
  
 = 
  
 new 
  
  BigQuery 
 
 (); 
 async 
  
 function 
  
 copyTable 
 () 
  
 { 
  
 // Copies src_dataset:src_table to dest_dataset:dest_table. 
  
 /** 
 * TODO(developer): Uncomment the following lines before running the sample 
 */ 
  
 // const srcDatasetId = "my_src_dataset"; 
  
 // const srcTableId = "my_src_table"; 
  
 // const destDatasetId = "my_dest_dataset"; 
  
 // const destTableId = "my_dest_table"; 
  
 // Copy the table contents into another table 
  
 const 
  
 [ 
 job 
 ] 
  
 = 
  
 await 
  
 bigquery 
  
 . 
 dataset 
 ( 
 srcDatasetId 
 ) 
  
 . 
 table 
 ( 
 srcTableId 
 ) 
  
 . 
  copy 
 
 ( 
 bigquery 
 . 
 dataset 
 ( 
 destDatasetId 
 ). 
 table 
 ( 
 destTableId 
 )); 
  
 console 
 . 
 log 
 ( 
 `Job 
 ${ 
  job 
 
 . 
 id 
 } 
 completed.` 
 ); 
  
 // Check the job's status for errors 
  
 const 
  
 errors 
  
 = 
  
  job 
 
 . 
 status 
 . 
 errors 
 ; 
  
 if 
  
 ( 
 errors 
 && 
 errors 
 . 
 length 
 > 
 0 
 ) 
  
 { 
  
 throw 
  
 errors 
 ; 
  
 } 
 } 
 

PHP

Before trying this sample, follow the PHP setup instructions in the BigQuery quickstart using client libraries . For more information, see the BigQuery PHP API reference documentation .

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries .

  use Google\Cloud\BigQuery\BigQueryClient; 
 /** 
 * Copy the contents of table from source table to destination table. 
 * 
 * @param string $projectId The project Id of your Google Cloud Project. 
 * @param string $datasetId The BigQuery dataset ID. 
 * @param string $sourceTableId Source tableId in dataset. 
 * @param string $destinationTableId Destination tableId in dataset. 
 */ 
 function copy_table( 
 string $projectId, 
 string $datasetId, 
 string $sourceTableId, 
 string $destinationTableId 
 ): void { 
 $bigQuery = new BigQueryClient([ 
 'projectId' => $projectId, 
 ]); 
 $dataset = $bigQuery->dataset($datasetId); 
 $sourceTable = $dataset->table($sourceTableId); 
 $destinationTable = $dataset->table($destinationTableId); 
 $copyConfig = $sourceTable->copy($destinationTable); 
 $job = $sourceTable->runJob($copyConfig); 
 // check if the job is complete 
 $job->reload(); 
 if (!$job->isComplete()) { 
 throw new \Exception('Job has not yet completed', 500); 
 } 
 // check if the job has errors 
 if (isset($job->info()['status']['errorResult'])) { 
 $error = $job->info()['status']['errorResult']['message']; 
 printf('Error running job: %s' . PHP_EOL, $error); 
 } else { 
 print('Table copied successfully' . PHP_EOL); 
 } 
 } 
 

Python

Before trying this sample, follow the Python setup instructions in the BigQuery quickstart using client libraries . For more information, see the BigQuery Python API reference documentation .

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries .

  from 
  
 google.cloud 
  
 import 
  bigquery 
 
 # Construct a BigQuery client object. 
 client 
 = 
  bigquery 
 
 . 
  Client 
 
 () 
 # TODO(developer): Set source_table_id to the ID of the original table. 
 # source_table_id = "your-project.source_dataset.source_table" 
 # TODO(developer): Set destination_table_id to the ID of the destination table. 
 # destination_table_id = "your-project.destination_dataset.destination_table" 
 job 
 = 
 client 
 . 
  copy_table 
 
 ( 
 source_table_id 
 , 
 destination_table_id 
 ) 
  job 
 
 . 
 result 
 () 
 # Wait for the job to complete. 
 print 
 ( 
 "A copy of the table created." 
 ) 
 

What's next

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