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added replace(), currId and nextId() methods

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zYne 2006-11-19 22:15:23 +00:00
parent d4df743a96
commit 5a5934db0b
1 changed files with 140 additions and 1 deletions
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141
lib/Doctrine/Connection/Mysql.php
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@ -40,7 +40,7 @@ class Doctrine_Connection_Mysql extends Doctrine_Connection_Common {
* the constructor
*
* @param Doctrine_Manager $manager
* @param PDO $pdo database handle
* @param PDO|Doctrine_Adapter $adapter database handler
*/
public function __construct(Doctrine_Manager $manager, $adapter) {
$adapter->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
@ -68,6 +68,145 @@ class Doctrine_Connection_Mysql extends Doctrine_Connection_Common {
parent::__construct($manager, $adapter);
}
/**
* Returns the next free id of a sequence
*
* @param string $seq_name name of the sequence
* @param boolean $ondemand when true the sequence is
* automatic created, if it
* not exists
*
* TODO: on demand creation of sequence table
*
* @return integer
*/
public function nextID($seqName, $ondemand = true) {
$sequenceName = $this->quoteIdentifier($this->getSequenceName($seqName), true);
$seqcolName = $this->quoteIdentifier($this->getAttribute(Doctrine::ATTR_SEQCOL_NAME), true);
$query = 'INSERT INTO ' . $sequenceName . ' (' . $seqcolName . ') VALUES (NULL)';
$value = $this->dbh->lastInsertId();
if(is_numeric($value)) {
$query = 'DELETE FROM ' . $sequenceName . ' WHERE ' . $seqcolName . ' < ' . $value;
$result = $this->dbh->query($query);
}
return $value;
}
/**
* Returns the current id of a sequence
*
* @param string $seq_name name of the sequence
* @return integer
*/
public function currID($seqName) {
$sequenceName = $this->quoteIdentifier($this->getSequenceName($seqName), true);
$seqcolName = $this->quoteIdentifier($this->options['seqcol_name'], true);
$query = 'SELECT MAX(' . $seqcolName . ') FROM ' . $sequenceName;
return $this->queryOne($query, 'integer');
}
/**
* Execute a SQL REPLACE query. A REPLACE query is identical to a INSERT
* query, except that if there is already a row in the table with the same
* key field values, the REPLACE query just updates its values instead of
* inserting a new row.
*
* The REPLACE type of query does not make part of the SQL standards. Since
* practically only MySQL implements it natively, this type of query is
* emulated through this method for other DBMS using standard types of
* queries inside a transaction to assure the atomicity of the operation.
*
* @access public
*
* @param string $table name of the table on which the REPLACE query will
* be executed.
* @param array $fields associative array that describes the fields and the
* values that will be inserted or updated in the specified table. The
* indexes of the array are the names of all the fields of the table. The
* values of the array are also associative arrays that describe the
* values and other properties of the table fields.
*
* Here follows a list of field properties that need to be specified:
*
* value:
* Value to be assigned to the specified field. This value may be
* of specified in database independent type format as this
* function can perform the necessary datatype conversions.
*
* Default:
* this property is required unless the Null property
* is set to 1.
*
* type
* Name of the type of the field. Currently, all types Metabase
* are supported except for clob and blob.
*
* Default: no type conversion
*
* null
* Boolean property that indicates that the value for this field
* should be set to null.
*
* The default value for fields missing in INSERT queries may be
* specified the definition of a table. Often, the default value
* is already null, but since the REPLACE may be emulated using
* an UPDATE query, make sure that all fields of the table are
* listed in this function argument array.
*
* Default: 0
*
* key
* Boolean property that indicates that this field should be
* handled as a primary key or at least as part of the compound
* unique index of the table that will determine the row that will
* updated if it exists or inserted a new row otherwise.
*
* This function will fail if no key field is specified or if the
* value of a key field is set to null because fields that are
* part of unique index they may not be null.
*
* Default: 0
*
* @return integer the number of affected rows
*/
public function replace($table, $fields) {
$count = count($fields);
$query = $values = '';
$keys = $colnum = 0;
for(reset($fields); $colnum < $count; next($fields), $colnum++) {
$name = key($fields);
if ($colnum > 0) {
$query .= ',';
$values.= ',';
}
$query .= $name;
if (isset($fields[$name]['null']) && $fields[$name]['null']) {
$value = 'NULL';
} else {
$type = isset($fields[$name]['type']) ? $fields[$name]['type'] : null;
$value = $this->quote($fields[$name]['value'], $type);
}
$values .= $value;
if (isset($fields[$name]['key']) && $fields[$name]['key']) {
if ($value === 'NULL')
throw new Doctrine_Connection_Mysql_Exception('key value '.$name.' may not be NULL');
$keys++;
}
}
if ($keys == 0)
throw new Doctrine_Connection_Mysql_Exception('not specified which fields are keys');
$query = 'REPLACE INTO ' . $table . ' (' . $query . ') VALUES (' . $values . ')';
return $this->dbh->exec($query);
}
}