What is the purpose of using PDO::pgsqlCopyToArray() in PHP for migrating data between databases?

When migrating data between PostgreSQL databases in PHP, using PDO::pgsqlCopyToArray() can efficiently transfer large datasets by copying data from one table to another. This method leverages PostgreSQL's COPY TO command to export data in a tab-separated format, which is then imported into the target database using the COPY FROM command. This process is faster and more efficient than traditional INSERT statements, especially for large datasets. 

// Connect to the source and target databases
$sourceDb = new PDO('pgsql:host=source_host;dbname=source_db', 'username', 'password');
$targetDb = new PDO('pgsql:host=target_host;dbname=target_db', 'username', 'password');

// Copy data from source table to target table
$sourceTable = 'source_table';
$targetTable = 'target_table';

$copyData = $sourceDb->pgsqlCopyToArray("COPY $sourceTable TO STDOUT", "\t");
$targetDb->pgsqlCopyFromArray("COPY $targetTable FROM STDIN", $copyData, "\t");

echo "Data migration completed successfully.";

Keywords

PDO pgsqlCopyToArray PHP migrating data databases

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