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<?php |
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2
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/** |
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* Test of PostgreSQL COPY FROM/TO facility. |
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4
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*/ |
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6
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namespace Ivory\Sandpit; |
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$conn = pg_connect('dbname=ivory_scratch user=ivory password=ivory', PGSQL_CONNECT_FORCE_NEW); |
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if ($conn === false) { |
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fprintf(STDERR, "Error connecting to the database\n"); |
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exit(1); |
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} |
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$res = pg_query($conn, 'CREATE TEMPORARY TABLE bar (a INT, b char(16), c FLOAT)'); |
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processResult($res); |
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echo "\n\n=== 1. COPY FROM STDIN ===\n"; |
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/* There are two ways of passing data: as an array of serialized rows, or using a stream, row-by-row. |
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* The first option may encapsulate pg_copy_from(); on top it, offer optional check of columns similar to that for |
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* pg_copy_to() - see below. |
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* The second option may use pg_put_line() for each serialized row, finalized with pg_end_copy(). |
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*/ |
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$res = pg_query($conn, 'COPY bar (a, b, c) FROM STDIN'); // result status: PGSQL_COPY_IN |
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processResult($res); |
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pg_put_line($conn, "3\thello world\t4.5\n"); |
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pg_put_line($conn, "4\tgoodbye world\t7.11\n"); |
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pg_put_line($conn, "\\.\n"); |
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pg_end_copy($conn); |
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$res = pg_query($conn, 'SELECT COUNT(*) FROM bar'); |
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$cnt = pg_fetch_result($res, 0, 0); |
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echo "bar COUNT(): "; var_dump($cnt); // prints 2 |
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echo "\n\n=== 2. COPY TO STDOUT ===\n"; |
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/* pg_copy_to() is limited to pass the data exactly in the order of the columns definition. |
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* It would be nice to optionally accept the intended column order, check it against the actual table definition, and |
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* swap the copied data on the fly in case of different order. It would still result in list of rows serialized as |
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* strings, just the interface would be richer. |
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*/ |
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$data = pg_copy_to($conn, 'bar'); |
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var_dump($data); |
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echo "\n\n=== 2b. COPY TO STDOUT using pg_socket()\n"; // cannot read the actual data |
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//$stream = pg_socket($conn); |
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$res = pg_query($conn, 'COPY bar (a, b, c) TO STDOUT'); // result status: PGSQL_COPY_OUT |
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processResult($res); |
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var_dump(pg_end_copy($conn)); |
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//while (true) { |
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// $read = [$stream]; |
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// $write = $except = []; |
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// $ready = stream_select($read, $write, $except, 4); |
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// if ($ready) { |
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// echo "ready; reading...\n"; |
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// $res = socket_read($read[0], 1024); |
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// if (strlen($res) == 0) { |
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// break; |
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// } |
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// var_dump($res); |
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// } |
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// else { |
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// echo "Not ready\n"; |
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// } |
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//} |
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echo "\n\n=== 3. COPY TO <file> ===\n"; |
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$filepath = realpath(tempnam(__DIR__, 'cpy')); |
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$res = pg_query($conn, "COPY bar (a, b, c) TO '$filepath'"); // result status: PGSQL_COMMAND_OK, command tag: COPY 2 |
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processResult($res); |
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echo "\n\n=== 4. COPY FROM <file> ===\n"; |
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$res = pg_query($conn, "COPY bar (a, b, c) FROM '$filepath'"); // result status: PGSQL_COMMAND_OK, command tag: COPY 2 |
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processResult($res); |
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$res = pg_query($conn, 'SELECT COUNT(*) FROM bar'); |
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$cnt = pg_fetch_result($res, 0, 0); |
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echo "bar COUNT(): "; var_dump($cnt); // prints 4 |
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83
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echo "\n\n=== 5. COPY TO PROGRAM <program> ===\n"; |
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$filepath2 = realpath(tempnam(__DIR__, 'cp2')); |
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$res = pg_query($conn, "COPY bar (a, b, c) TO PROGRAM 'cat > $filepath2'"); // result status: PGSQL_COMMAND_OK, command tag: COPY 4 |
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processResult($res); |
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echo "\n\n=== 6. COPY FROM PROGRAM <program> ===\n"; |
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$res = pg_query($conn, "COPY bar (a, b, c) FROM PROGRAM 'cat $filepath2'"); // result status: PGSQL_COMMAND_OK, command tag: COPY 4 |
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processResult($res); |
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94
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$res = pg_query($conn, 'SELECT COUNT(*) FROM bar'); |
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$cnt = pg_fetch_result($res, 0, 0); |
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echo "bar COUNT(): "; var_dump($cnt); // prints 8 |
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100
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101
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unlink($filepath); |
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unlink($filepath2); |
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104
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105
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function processResult($res) |
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{ |
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$statCodes = [ |
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PGSQL_EMPTY_QUERY => 'empty query', |
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PGSQL_COMMAND_OK => 'command ok', |
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PGSQL_TUPLES_OK => 'tuples ok', |
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PGSQL_COPY_IN => 'copy in', |
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PGSQL_COPY_OUT => 'copy out', |
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PGSQL_BAD_RESPONSE => 'bad response', |
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PGSQL_NONFATAL_ERROR => 'non-fatal error', // reported as impossible to get this status returned from php pgsql |
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PGSQL_FATAL_ERROR => 'fatal error', |
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]; |
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$statCode = pg_result_status($res); |
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$statStr = pg_result_status($res, PGSQL_STATUS_STRING); |
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echo "Result status: $statCode ({$statCodes[$statCode]}); $statStr\n"; |
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echo "Error fields:\n"; |
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$fields = [ |
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'SQL state' => PGSQL_DIAG_SQLSTATE, |
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'Severity' => PGSQL_DIAG_SEVERITY, |
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'Message' => PGSQL_DIAG_MESSAGE_PRIMARY, |
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'Detail' => PGSQL_DIAG_MESSAGE_DETAIL, |
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'Hint' => PGSQL_DIAG_MESSAGE_HINT, |
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'Statement position' => PGSQL_DIAG_STATEMENT_POSITION, |
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'Internal position' => PGSQL_DIAG_INTERNAL_POSITION, |
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'Internal query' => PGSQL_DIAG_INTERNAL_QUERY, |
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'Context' => PGSQL_DIAG_CONTEXT, |
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'Source file' => PGSQL_DIAG_SOURCE_FILE, |
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'Source line' => PGSQL_DIAG_SOURCE_LINE, |
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'Source function' => PGSQL_DIAG_SOURCE_FUNCTION, |
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]; |
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foreach ($fields as $desc => $field) { |
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echo "$desc: "; var_dump(pg_result_error_field($res, $field)); |
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} |
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echo "---------------------\n"; |
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} |
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ondrej-bouda /
ivory
