(not native English speaker, any help appreciated)
- Protection from SQL injections
- DBD/DBI perl-like
- Easy coding
- Memcache easy integration
- Error handling
- Extendable by other drivers (only PostgreSQL ready, other coming)
- du
- query
- prepare
- execute
- fetch
- fetchrow
- fetchrowset
- insert
- update
- begin
- commit
- rollback
- cache
- drop
- rows
- getColumn
- result
connect — initiate connection to a database
resource connect ( string $dsn [, string $username [, string $password [, array $options ]]] )connect() opens a connection to a database specified by the dsn.
dsn
The dsn should contain one or more parameter settings separated by semicolon. Each parameter setting is in the form keyword = value. The currently recognized parameter keywords are: host, port, dbname, user, password,
username
Database username. If provided, then should be omitted in dsn.
password
Database user password. If provided, then should be omitted in dsn.
options
array of options. The currently recognized options are:
Parameter default value definition PrintError true Print out errors to current output handler in case of SQL syntax error RaiseError true If true, then HTTP status 500 will be thrown with exception. ShowErrorStatement false Works only if PrintError set to true. If true, then error message will contain failed SQL statement HTMLError false Works only if PrintError set to true. By default error message has text format. Set to true if HTML error is preferred. Persistent false Will initiate persistent connection in case of true value ConvertNumeric false By default PHP native library returns all integer and float values as text. Set to true if you need convert to proper type. UseDebug false If true counts queries and benchmark each with EXPLAIN. Can be printed out before disconnect. ErrorHandler null You can create own error handler and use it errors catcher. CacheDriver null Cache driver instance.
Class DBD\Base\ErrorHandler has three public classes: composeData(), composeTETXError, composeHTMLError
$db_options = array( 'ErrorHandler' => 'SQLErrorHandler' ); // Create DSN $dsn = (new DBD\Pg())->create("host=localhost;port=5432;dbname=falseclock", "username","password", $db_options); // make connection to the database $db = $dsn->connect(); class SQLErrorHandler extends DBD\Base\ErrorHandler { public function __construct($query, $errstr, $caller, $options=null) { $error = $this->composeData($query, $errstr, $caller); $filename = "sql.log"; $file_data = json_encode($error, JSON_UNESCAPED_UNICODE)."\n"; if (! file_exists($filename)) { @file_put_contents($filename, ''); } $file_data .= @file_get_contents($filename); @file_put_contents($filename, $file_data); @chmod($filename,0666); $html = $this->composeHTMLError($query, $errstr, $caller, $options); echo($html); exit(); } }$cache = DBD\Cache\MemCache::me()->create(array(['host' => '127.0.0.1', 'port' => 11211]), false, 15)->open(); $db_options = array( 'CacheDriver' => $cache, 'ErrorHandler' => 'SQLErrorHandler' ); // Create DSN $dsn = (new DBD\Pg())->create("host=localhost;port=5432;dbname=falseclock", "username","password", $db_options); // make connection to the database $db = $dsn->connect(); $sth = $db->prepare("SELECT bank_id AS id, bank_name AS name FROM banks ORDER BY bank_name ASC"); $sth->cache("AllBanks"); // <--- this will $sth->execute(); // Will try to fetch from catch if exist or will query database and store to cache
du — Returns number of affected records (tuples)
int du ( string $statement [, mixed $params ] )du() returns the number of tuples (instances/records/rows) affected by INSERT, UPDATE, and DELETE queries.
Since PostgreSQL 9.0 and above, the server returns the number of SELECTed rows. Older PostgreSQL return 0 for SELECT.
statement
The SQL statement to be executed. Can have placeholders. Must contain only a single statement (multiple statements separated by semi-colons are not allowed). If any parameters are used, they are referred to as ?, ?, etc.
params
An array of parameter values to substitute for the ?, ?, etc. placeholders in the original prepared SQL statement string. The number of elements in the array must match the number of placeholders.
<?php
$db_options = array(
'ConvertNumeric' => true,
'UseDebug' => true
);
// Create DSN
$dsn = (new DBD\Pg())->create("host=localhost;port=5432;dbname=falseclock", "username","password", $db_options);
// make connection to the database
$db = $dsn->connect();
// Bad example how SQL can be injected as every string parameter must be escaped
// manually or with $db->quote('must be null');
$param = "'must be null'";
$result = $db->du("UPDATE table SET column1 = NULL WHERE column2 = $param");
// more easiest, simple and safe for SQL injections way.
// Number of affected tuples will be stored in $result variable
$result = $db->du("UPDATE table SET column1 = ? WHERE column2 = ?", NULL, 'must be null');
?>query — quick statement execution
resource query ( string $statement [, mixed $params ] )query() do the same as du() method, but returns self instance.
statement
The SQL statement to be executed. Can have placeholders. Must contain only a single statement (multiple statements separated by semi-colons are not allowed). If any parameters are used, they are referred to as ?, ?, etc.
params
An array of parameter values to substitute for the ?, ?, etc. placeholders in the original prepared SQL statement string. The number of elements in the array must match the number of placeholders.
<?php
$sth = $db->query("SELECT * FROM invoices");
while ($row = $sth->fetchrow()) {
// do something
}
$sth = $db->query("UPDATE invoices SET invoice_uuid=?",'550e8400-e29b-41d4-a716-446655440000');
echo($sth->rows);
?>prepare — creates a prepared statement for later execution with execute() method. This feature allows commands that will be used repeatedly to be parsed and planned just once, rather than each time they are executed.
resource prepare ( string $statement )prepare() returns the new DB driver instance.
statement
The SQL statement to be executed. Can have placeholders. Must contain only a single statement (multiple statements separated by semi-colons are not allowed). If any parameters are used, they are referred to as ?, ?, etc.
<?php
// Common usage for repeatedly SELECT queries
$sth = $db->prepare("UPDATE table SET column1 = ? WHERE column2 = ?");
$fruits = array('apple','banana','apricot');
foreach ($fruits as $fruit) {
$sth->execute(NULL,$fruit);
}
// this code will execute three statements
// UPDATE table SET column1 = NULL WHERE column2 = 'apple';
// UPDATE table SET column1 = NULL WHERE column2 = 'banana';
// UPDATE table SET column1 = NULL WHERE column2 = 'apricot';
?>execute — Sends a request to execute a prepared statement with given parameters, and waits for the result.
resource execute ( [ mixed $params ] )execute() executes previously-prepared statement, instead of giving a query string. This feature allows commands that will be used repeatedly to be parsed and planned just once, rather than each time they are executed. The statement must have been prepared previously.
params
An array of parameter values to substitute for the ?, ?, etc. placeholders in the original prepared query string. The number of elements in the array must match the number of placeholders.
<?php
$db_options = array(
'ConvertNumeric' => true,
'UseDebug' => true
);
// Create DSN
$dsn = (new DBD\Pg())->create("host=localhost;port=5432;dbname=falseclock", "username","password", $db_options);
// make connection to the database
$db = $dsn->connect();
// Common usage for repeatedly UPDATE queries
$sth = $db->prepare("SELECT col1, col2, col3 FROM table1");
$std = $db->prepare("UPDATE table2 SET col2 =? WHERE col1=? AND col2=?");
$sth->execute();
while ($row = $sth->fetchrow()) {
if ($row['col1'] == 'banana') {
$std->execute(FALSE,NULL,$row[col2]);
}
}
?>fetch — Fetch a column from first row.
mixed fetch ()fetch() fetch a column from first row without fetching whole row and not reducing result. Calling fetchrow() or fetchrowset() will still return whole result set. Subsequent fetch() invoking will return next column in a row. Useful when you need to get value of column when it is a same in all rows.
<?php
$sth = $db->prepare("SELECT 'VIR-TEX LLP' AS company, generate_series AS wrh_id, 'Warehouse #'||trunc(random()*1000) AS wrh_name, trunc((random()*1000)::numeric, 2) AS wrh_volume FROM generate_series(1,3)");
/* select result example
company | wrh_id | wrh_name | wrh_volume
-------------+--------+----------------+------------
VIR-TEX LLP | 1 | Warehouse #845 | 489.20
VIR-TEX LLP | 2 | Warehouse #790 | 241.80
VIR-TEX LLP | 3 | Warehouse #509 | 745.29
*/
$sth->execute();
$company_name = $sth->fetch(); // getting first column
$wrh_id = $sth->fetch(); // getting second column as an example of subsequent invoking
$wrh_name = $sth->fetch(); // getting third column
echo ("Company name: $company\n");
while ($row = $sth->fetchrow()) {
echo(" {$row['wrh_name']} volume {$row['wrh_volume']}\n");
}
/* cycle abobe will produce following printout
Company name: VIR-TEX LLP
Warehouse #845 volume: 489.20
Warehouse #790 volume: 241.80
Warehouse #509 volume: 745.29
*/
?>fetchrow — fetch a row as an associative array
array fetchrow ()fetchrow() returns an associative array that corresponds to the fetched row (records).
An array indexed associatively (by field name). Each value in the array is represented as a string. Database NULL values are returned as NULL.
FALSE is returned if row exceeds the number of rows in the set, there are no more rows, or on any other error.
<?php
$sth = $db->prepare("SELECT *, 'orange' AS col1, 'apple' AS col2, 'tomato' AS col3 FROM generate_series(1,3)");
$sth->execute();
print_r($sth->fetchrow());
/* code above will produce following printout
Array
(
[generate_series] => 1
[col1] => orange
[col2] => apple
[col3] => tomato
)
*/
?>fetchrowset — fetch a full result as multidimensional array, where each element is an associative array that corresponds to the fetched row.
array fetchrowset ([ string $key ])key
A column name to use as an index. If two or more columns will have the same value in a column, only last row will be stored in array.
An associative array (in case if key provided) or indexed array if no key was provided. Each value in the array represented as an associative array (by field name). Values in a row Database NULL values are returned as NULL.
<?php
$sth = $db->prepare("SELECT generate_series AS wrh_id, 'Warehouse #'||trunc(random()*1000) AS wrh_name, trunc((random()*1000)::numeric, 2) AS wrh_volume FROM generate_series(1,3)");
$sth->execute();
print_r($sth->fetchrowset());
/* code above will produce following printout
Array
(
[0] => Array
(
[wrh_id] => 1
[wrh_name] => Warehouse #795
[wrh_volume] => 809.73
)
[1] => Array
(
[wrh_id] => 2
[wrh_name] => Warehouse #639
[wrh_volume] => 894.50
)
[2] => Array
(
[wrh_id] => 3
[wrh_name] => Warehouse #334
[wrh_volume] => 13.77
)
)
*/
$sth->execute();
print_r($sth->fetchrowset('wrh_name'));
/*
Array
(
[Warehouse #214] => Array
(
[wrh_id] => 1
[wrh_name] => Warehouse #214
[wrh_volume] => 462.10
)
[Warehouse #563] => Array
(
[wrh_id] => 2
[wrh_name] => Warehouse #563
[wrh_volume] => 8.88
)
[Warehouse #634] => Array
(
[wrh_id] => 3
[wrh_name] => Warehouse #634
[wrh_volume] => 338.18
)
)
*/
?>insert — makes new row insertion into the table. Returns self instance.
mixed insert (string $table, array $values [, string $return])table
Database table name
values
An associative array where key is field name and value is a field value.
return
You can define which fields of the table you want return after succesfull insert
<?php
$insert = array(
'vatinvoice_uuid' => $doc['Ref'],
'vatinvoice_date' => $doc['Date'],
'vatinvoice_number' => $doc['Number'],
'vatinvoice_amount' => $doc['Amount'],
'waybill_uuid' => $doc['reference']['uuid']
);
$sth = $db->insert('vatinvoices',$insert);
echo ($sth->rows);
?><?php
$insert = array(
//'payment_id' => IS SERIAL, will be generated automatically
'payment_uuid' => $payment['Ref'],
'payment_date' => $payment['Date'],
'payment_number' => $payment['Number'],
'payment_amount' => $payment['Amount']
);
$sth = $db->insert('payments',$insert,'payment_id, payment_uuid');
while ($row = $sth->fetchrow()) {
printf("We inserted new payment with ID=%d and UUID=%s\n",$row['payment_id'],$row['payment_uuid']);
}
?>update — makes updates of the rows by giving parameters and prepared values. Returns self instance.
mixed update (string $table, array $values [, mixed $where..., [ mixed $args...], [string $return]])table
Database table name
values
An associative array where key is field name and value is a field value.
where
Specifies update condition. Can have placeholders.
args
Binds value for where condition. Strict if placeholders are exist in where parameter. Can be omitted if there are no any placeholders in where parameter.
return
You can define which fields of the table you want return after succesfull insert
<?php
$update = array(
'vatinvoice_date' => $doc['Date'],
'vatinvoice_number' => $doc['Number'],
'vatinvoice_amount' => $doc['Amount']
);
// this will update all rows in a table
$sth = $db->update('vatinvoices',$update);
echo ($sth->rows);
?><?php
$update = array(
'vatinvoice_date' => $doc['Date'],
'vatinvoice_number' => $doc['Number'],
'vatinvoice_amount' => $doc['Amount']
);
// this will update all rows in a table where vatinvoice_uuid equals to some value
$sth = $db->update('vatinvoices', $update, "vatinvoice_uuid=?", $doc['UUID']);
echo ($sth->rows);
?><?php
$update = array(
'vatinvoice_date' => $doc['Date'],
'vatinvoice_number' => $doc['Number'],
'vatinvoice_amount' => $doc['Amount']
);
// this will update all rows in a table where vatinvoice_uuid is null
// query will return vatinvoice_id
$sth = $db->update('vatinvoices', $update, "vatinvoice_uuid IS NULL", "vatinvoice_id");
while ($row = $sth->fetchrow()) {
printf("Updated vatinvoice with ID=%d\n", $row['vatinvoice_id']);
}
?><?php
$update = array(
'vatinvoice_date' => $doc['Date'],
'vatinvoice_number' => $doc['Number'],
'vatinvoice_amount' => $doc['Amount']
);
// this will update all rows in a table where vatinvoice_uuid equals to some value
// query will return vatinvoice_id
$sth = $db->update('vatinvoices',$update,"vatinvoice_uuid =? ", $doc['UUID'], "vatinvoice_id, vatinvoice_uuid");
while ($row = $sth->fetchrow()) {
printf("Updated vatinvoice with ID=%d and UUID=%s\n",$row['vatinvoice_id'],$row['vatinvoice_uuid']);
}
?>begin — Starts database transaction
mixed begin ()begin() enable transactions (by turning AutoCommit off) until the next call to commit or rollback. After the next commit or rollback, AutoCommit will automatically be turned on again.
<?php
$db_options = array(
'ConvertNumeric' => true,
'UseDebug' => true
);
// Create DSN
$dsn = (new DBD\Pg())->create("host=localhost;port=5432;dbname=falseclock", "username","password", $db_options);
// make connection to the database
$db = $dsn->connect();
$db->begin();
// Common usage for repeatedly UPDATE queries
$sth = $db->prepare("SELECT col1, col2, col3 FROM table1");
$std = $db->prepare("UPDATE table2 SET col2 =? WHERE col1=? AND col2=?");
$sth->execute();
while ($row = $sth->fetchrow()) {
if ($row['col1'] == 'banana') {
$std->execute(FALSE,NULL,$row[col2]);
}
}
$db->commit();
?>commit — Commit database transaction
mixed commit ()commit() makes permanent the most recent series of database changes if the database supports transactions and AutoCommit is off.
rollback — undo changes
mixed rollback ()rollback() undo the most recent series of uncommitted database changes if the database supports transactions and AutoCommit is off.
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