/usr/share/php/Horde/Db/Adapter/Oracle/Schema.php is in php-horde-db 2.3.1-1ubuntu2.
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/**
* Copyright 2013-2016 Horde LLC (http://www.horde.org/)
*
* @author Jan Schneider <jan@horde.org>
* @license http://www.horde.org/licenses/bsd
* @category Horde
* @package Db
* @subpackage Adapter
*/
/**
* Class for Oracle-specific managing of database schemes and handling of SQL
* dialects and quoting.
*
* @since Horde_Db 2.1.0
* @author Jan Schneider <jan@horde.org>
* @license http://www.horde.org/licenses/bsd
* @category Horde
* @package Db
* @subpackage Adapter
*/
class Horde_Db_Adapter_Oracle_Schema extends Horde_Db_Adapter_Base_Schema
{
/*##########################################################################
# Object factories
##########################################################################*/
/**
* Factory for Column objects.
*
* @param string $name Column name, such as "supplier_id" in
* "supplier_id int(11)".
* @param string $default Type-casted default value, such as "new"
* in "sales_stage varchar(20) default 'new'".
* @param string $sqlType Column type.
* @param boolean $null Whether this column allows NULL values.
* @param integer $length Column width.
* @param integer $precision Precision for NUMBER and FLOAT columns.
* @param integer $scale Number of digits to the right of the decimal
* point in a number.
*
* @return Horde_Db_Adapter_Base_Column A column object.
*/
public function makeColumn($name, $default, $sqlType = null, $null = true,
$length = null, $precision = null, $scale = null)
{
return new Horde_Db_Adapter_Oracle_Column(
$name, $default, $sqlType, $null,
$length, $precision, $scale
);
}
/**
* Factory for TableDefinition objects.
*
* @return Horde_Db_Adapter_Base_TableDefinition A table definition object.
*/
public function makeTableDefinition($name, $base, $options = array())
{
return new Horde_Db_Adapter_Oracle_TableDefinition($name, $base, $options);
}
/*##########################################################################
# Quoting
##########################################################################*/
/**
* Returns a quoted form of the column name.
*
* With Oracle, if using quoted identifiers, you need to use them
* everywhere. 'SELECT * FROM "tablename"' is NOT the same as 'SELECT *
* FROM tablename'. Thus we cannot blindly quote table or column names,
* unless we know that in subsequent queries they will be used too.
*
* @param string $name A column name.
*
* @return string The quoted column name.
*/
public function quoteColumnName($name)
{
return $name;
}
/**
* Returns a quoted binary value.
*
* @param mixed A binary value.
*
* @return string The quoted binary value.
*/
public function quoteBinary($value)
{
return "'" . bin2hex($value) . "'";
}
/*##########################################################################
# Schema Statements
##########################################################################*/
/**
* Returns a hash of mappings from the abstract data types to the native
* database types.
*
* See TableDefinition::column() for details on the recognized abstract
* data types.
*
* @see TableDefinition::column()
*
* @return array A database type map.
*/
public function nativeDatabaseTypes()
{
return array(
'autoincrementKey' => array('name' => 'number NOT NULL PRIMARY KEY',
'limit' => null,
'null' => null),
'string' => array('name' => 'varchar2',
'limit' => 255),
'text' => array('name' => 'clob',
'limit' => null),
'mediumtext' => array('name' => 'clob',
'limit' => null),
'longtext' => array('name' => 'clob',
'limit' => null),
'integer' => array('name' => 'number',
'limit' => null),
'bigint' => array('name' => 'number',
'limit' => null),
'float' => array('name' => 'float',
'limit' => null),
'decimal' => array('name' => 'number',
'limit' => null),
'datetime' => array('name' => 'date',
'limit' => null),
'timestamp' => array('name' => 'date',
'limit' => null),
'time' => array('name' => 'varchar2',
'limit' => 8),
'date' => array('name' => 'date',
'limit' => null),
'binary' => array('name' => 'blob',
'limit' => null),
'boolean' => array('name' => 'number',
'precision' => 1,
'scale' => 0),
);
}
/**
* Returns the maximum length a table alias can have.
*
* @return integer The maximum table alias length.
*/
public function tableAliasLength()
{
return 30;
}
/**
* Converts a table name into a suitable table alias.
*
* @param string $tableName A table name.
*
* @return string A possible alias name for the table.
*/
public function tableAliasFor($tableName)
{
return parent::tableAliasFor($this->_truncate($tableName));
}
/**
* Returns a list of all tables of the current database.
*
* @return array A table list.
*/
public function tables()
{
return array_map(
array('Horde_String', 'lower'),
$this->selectValues('SELECT table_name FROM USER_TABLES')
);
}
/**
* Returns a table's primary key.
*
* @param string $tableName A table name.
* @param string $name (can be removed?)
*
* @return Horde_Db_Adapter_Base_Index The primary key index object.
*/
public function primaryKey($tableName, $name = null)
{
$pk = $this->makeIndex(
$tableName,
'PRIMARY',
true,
true,
array()
);
$rows = @unserialize($this->cacheRead("tables/primarykeys/$tableName"));
if (!$rows) {
$constraint = $this->selectOne(
'SELECT CONSTRAINT_NAME FROM USER_CONSTRAINTS WHERE TABLE_NAME = ? AND CONSTRAINT_TYPE = \'P\'',
array(Horde_String::upper($tableName)),
$name
);
if ($constraint['constraint_name']) {
$pk->name = $constraint['constraint_name'];
$rows = $this->selectValues(
'SELECT DISTINCT COLUMN_NAME FROM USER_CONS_COLUMNS WHERE CONSTRAINT_NAME = ?',
array($constraint['constraint_name'])
);
$rows = array_map(array('Horde_String', 'lower'), $rows);
$this->cacheWrite("tables/primarykeys/$tableName", serialize($rows));
} else {
$rows = array();
}
}
$pk->columns = $rows;
return $pk;
}
/**
* Returns a list of tables indexes.
*
* @param string $tableName A table name.
* @param string $name (can be removed?)
*
* @return array A list of Horde_Db_Adapter_Base_Index objects.
*/
public function indexes($tableName, $name = null)
{
$rows = @unserialize($this->cacheRead("tables/indexes/$tableName"));
if (!$rows) {
$rows = $this->selectAll(
'SELECT INDEX_NAME, UNIQUENESS FROM USER_INDEXES WHERE TABLE_NAME = ? AND INDEX_NAME NOT IN (SELECT INDEX_NAME FROM USER_LOBS)',
array(Horde_String::upper($tableName)),
$name
);
$this->cacheWrite("tables/indexes/$tableName", serialize($rows));
}
$indexes = array();
$primary = $this->primaryKey($tableName);
foreach ($rows as $row) {
if ($row['index_name'] == $primary->name) {
continue;
}
$columns = $this->selectValues(
'SELECT DISTINCT COLUMN_NAME FROM USER_IND_COLUMNS WHERE INDEX_NAME = ?',
array($row['index_name'])
);
$indexes[] = $this->makeIndex(
$tableName,
Horde_String::lower($row['index_name']),
false,
$row['uniqueness'] == 'UNIQUE',
array_map(array('Horde_String', 'lower'), $columns)
);
}
return $indexes;
}
/**
* Returns a list of table columns.
*
* @param string $tableName A table name.
* @param string $name (can be removed?)
*
* @return array A list of Horde_Db_Adapter_Base_Column objects.
*/
public function columns($tableName, $name = null)
{
$rows = @unserialize($this->cacheRead("tables/columns/$tableName"));
if (!$rows) {
$rows = $this->selectAll(
'SELECT COLUMN_NAME, DATA_DEFAULT, DATA_TYPE, NULLABLE, DATA_LENGTH, DATA_PRECISION, DATA_SCALE FROM USER_TAB_COLUMNS WHERE TABLE_NAME = ?',
array(Horde_String::upper($tableName)),
$name
);
$this->cacheWrite("tables/columns/$tableName", serialize($rows));
}
// Create columns from rows.
$columns = array();
foreach ($rows as $row) {
$column = Horde_String::lower($row['column_name']);
$columns[$column] = $this->makeColumn(
$column,
$row['data_default'],
$row['data_type'],
$row['nullable'] != 'N',
$row['data_length'],
$row['data_precision'],
$row['data_scale']
);
}
return $columns;
}
/**
* Renames a table.
*
* @param string $name A table name.
* @param string $newName The new table name.
*/
public function renameTable($name, $newName)
{
$this->_clearTableCache($name);
return $this->execute(
sprintf(
'ALTER TABLE %s RENAME TO %s',
$this->quoteTableName($name),
$this->quoteTableName($newName)
)
);
}
/**
* Drops a table from the database.
*
* @param string $name A table name.
*/
public function dropTable($name)
{
$this->removeAutoincrementTrigger($name);
parent::dropTable($name);
}
/**
* Adds a new column to a table.
*
* @param string $tableName A table name.
* @param string $columnName A column name.
* @param string $type A data type.
* @param array $options Column options. See
* Horde_Db_Adapter_Base_TableDefinition#column()
* for details.
*/
public function addColumn($tableName, $columnName, $type,
$options = array())
{
$this->_clearTableCache($tableName);
$options = array_merge(
array('limit' => null,
'precision' => null,
'scale' => null,
'unsigned' => null),
$options);
$sql = $this->quoteColumnName($columnName)
. ' '
. $this->typeToSql(
$type,
$options['limit'],
$options['precision'],
$options['scale'],
$options['unsigned']
);
$sql = $this->addColumnOptions($sql, $options);
$sql = sprintf(
'ALTER TABLE %s ADD (%s)',
$this->quoteTableName($tableName),
$sql
);
$this->execute($sql);
if ($type == 'autoincrementKey') {
$this->createAutoincrementTrigger($tableName, $columnName);
}
}
/**
* Removes a column from a table.
*
* @param string $tableName A table name.
* @param string $columnName A column name.
*/
public function removeColumn($tableName, $columnName)
{
$this->_clearTableCache($tableName);
$sql = sprintf('ALTER TABLE %s DROP COLUMN %s',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName));
$this->removeAutoincrementTrigger($tableName, $columnName);
return $this->execute($sql);
}
/**
* Changes an existing column's definition.
*
* @param string $tableName A table name.
* @param string $columnName A column name.
* @param string $type A data type.
* @param array $options Column options. See
* Horde_Db_Adapter_Base_TableDefinition#column()
* for details.
*/
public function changeColumn($tableName, $columnName, $type, $options = array())
{
$options = array_merge(
array(
'limit' => null,
'precision' => null,
'scale' => null,
'unsigned' => null
),
$options
);
$column = $this->column($tableName, $columnName);
$isNull = $column->isNull();
if ($type == 'binary' && $column->getType() == 'binary') {
return;
}
$columnOptions = array(
'limit' => $column->getLimit(),
'default' => $column->getDefault(),
);
if (!$column->isNull()) {
$columnOptions['null'] = false;
}
$old = $this->addColumnOptions(
$this->typeToSql(
$column->getType(),
$column->getType() == 'integer' || is_null($options['limit'])
? null
: $column->getLimit(),
is_null($options['precision']) ? null : $column->precision(),
is_null($options['scale']) ? null : $column->scale(),
is_null($options['unsigned']) ? null : $column->isUnsigned()
),
$columnOptions
);
$new = $this->typeToSql(
$type,
$options['limit'],
$options['precision'],
$options['scale'],
$options['unsigned']
);
if ($old == $this->addColumnOptions($new, $options)) {
return;
}
if ($type == 'autoincrementKey') {
try {
$this->removeAutoincrementTrigger($tableName);
$this->removePrimaryKey($tableName);
} catch (Horde_Db_Exception $e) {
}
if (!$isNull) {
/* Manually set to NULL, because MODIFY fails if it contains a
* NOT NULL constraint and the column already is NOT NULL. */
$sql = $this->quoteColumnName($columnName)
. ' '
. $this->typeToSql(
$column->getType(),
$column->getType() == 'integer' ? null : $column->getLimit(),
$column->precision(),
$column->scale(),
$column->isUnsigned()
);
$sql = $this->addColumnOptions($sql, array('null' => true));
$sql = sprintf(
'ALTER TABLE %s MODIFY (%s)',
$this->quoteTableName($tableName),
$sql
);
$this->execute($sql);
}
} else {
/* Jump through some more hoops because MODIFY fails if it contains
* a NOT NULL constraint and the column already is NOT NULL. */
if (isset($options['null']) && $isNull == $options['null']) {
unset($options['null']);
} elseif (!isset($options['null']) && !$isNull) {
$options['null'] = true;
}
}
$this->_clearTableCache($tableName);
if ($type == 'binary' && $column->getType() != 'binary') {
$this->beginDbTransaction();
$this->addColumn($tableName, $columnName . '_tmp', $type, $options);
$this->execute('
CREATE OR REPLACE FUNCTION CLOB_TO_BLOB (p_clob CLOB) RETURN BLOB
AS
l_blob BLOB;
l_dest_offset INTEGER := 1;
l_source_offset INTEGER := 1;
l_lang_context INTEGER := DBMS_LOB.DEFAULT_LANG_CTX;
l_warning INTEGER := DBMS_LOB.WARN_INCONVERTIBLE_CHAR;
BEGIN
DBMS_LOB.CREATETEMPORARY(l_blob, TRUE);
DBMS_LOB.CONVERTTOBLOB
(
dest_lob => l_blob,
src_clob => p_clob,
amount => DBMS_LOB.LOBMAXSIZE,
dest_offset => l_dest_offset,
src_offset => l_source_offset,
blob_csid => DBMS_LOB.DEFAULT_CSID,
lang_context => l_lang_context,
warning => l_warning
);
RETURN l_blob;
END;
');
$this->update(sprintf(
'UPDATE %s SET %s = CLOB_TO_BLOB(%s) WHERE %s IS NOT NULL',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName . '_tmp'),
$this->quoteColumnName($columnName),
$this->quoteColumnName($columnName)
));
$this->update(sprintf(
'UPDATE %s SET %s = NULL WHERE %s IS NULL',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName . '_tmp'),
$this->quoteColumnName($columnName)
));
$this->removeColumn($tableName, $columnName);
$this->renameColumn($tableName, $columnName . '_tmp', $columnName);
$this->commitDbTransaction();
return;
}
if ($type != 'binary' && $column->getType() == 'binary') {
$this->beginDbTransaction();
$this->addColumn($tableName, $columnName . '_tmp', $type, $options);
$this->update(sprintf(
'UPDATE %s SET %s = UTL_RAW.CAST_TO_VARCHAR2(%s)',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName . '_tmp'),
$this->quoteColumnName($columnName)
));
$this->removeColumn($tableName, $columnName);
$this->renameColumn($tableName, $columnName . '_tmp', $columnName);
$this->commitDbTransaction();
return;
}
if ($type == 'text' && $column->getType() != 'text') {
$this->beginDbTransaction();
$this->addColumn($tableName, $columnName . '_tmp', $type, $options);
$this->update(sprintf(
'UPDATE %s SET %s = TO_CLOB(%s)',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName . '_tmp'),
$this->quoteColumnName($columnName)
));
$this->removeColumn($tableName, $columnName);
$this->renameColumn($tableName, $columnName . '_tmp', $columnName);
$this->commitDbTransaction();
return;
}
if ($type != 'text' && $column->getType() == 'text') {
$this->beginDbTransaction();
$this->addColumn($tableName, $columnName . '_tmp', $type, $options);
$this->update(sprintf(
'UPDATE %s SET %s = DBMS_LOB.SUBSTR(%s, 4000)',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName . '_tmp'),
$this->quoteColumnName($columnName)
));
$this->removeColumn($tableName, $columnName);
$this->renameColumn($tableName, $columnName . '_tmp', $columnName);
$this->commitDbTransaction();
return;
}
$sql = $this->quoteColumnName($columnName) . ' ' . $new;
$sql = $this->addColumnOptions($sql, $options);
$sql = sprintf(
'ALTER TABLE %s MODIFY (%s)',
$this->quoteTableName($tableName),
$sql
);
$this->execute($sql);
if ($type == 'autoincrementKey') {
$this->createAutoincrementTrigger($tableName, $columnName);
}
}
/**
* Creates sequences and triggers for an autoincrementKey column.
*
* @since Horde_Db 2.1.0
*
* @param string $tableName A table name.
* @param string $columnName A column name.
*/
public function createAutoincrementTrigger($tableName, $columnName)
{
// Build the table that holds the last autoincremented value. Used for
// example for returning the ID from last INSERT.
$id = $tableName . '_' . $columnName;
if (!$this->selectValue('SELECT 1 FROM USER_TABLES WHERE TABLE_NAME = \'HORDE_DB_AUTOINCREMENT\'')) {
$this->execute('CREATE TABLE horde_db_autoincrement (id INTEGER)');
$this->execute('INSERT INTO horde_db_autoincrement (id) VALUES (0)');
}
// Create a sequence that automatically increments when queried with
// .NEXTVAL.
$sequence = $this->_truncate($id . '_seq');
$sql = sprintf(
'CREATE SEQUENCE %s',
$sequence
);
// See if the column already has values, to start the sequence at a
// higher value.
$max = $this->selectValue(
sprintf(
'SELECT MAX(%s) FROM %s',
$this->quoteColumnName($columnName),
$tableName
)
);
if ($max) {
$sql .= ' MINVALUE ' . ($max + 1);
}
$this->execute($sql);
// Create the actual trigger that inserts the next value from the
// sequence into the autoincrementKey column when inserting a row.
$this->execute(sprintf(
'CREATE OR REPLACE TRIGGER %s BEFORE INSERT ON %s FOR EACH ROW DECLARE increment INTEGER; BEGIN SELECT %s.NEXTVAL INTO :NEW.%s FROM dual; SELECT %s.CURRVAL INTO increment FROM dual; UPDATE horde_db_autoincrement SET id = increment; END;',
$this->_truncate($id . '_trig'),
$tableName,
$sequence,
$columnName,
$sequence
));
}
/**
* Drops sequences and triggers for an autoincrementKey column.
*
* If $columnName is specified, the sequences and triggers are only dropped
* if $columnName is actually an autoincrementKey column.
*
* @since Horde_Db 2.1.0
*
* @param string $tableName A table name.
* @param string $columnName A column name.
*/
public function removeAutoincrementTrigger($tableName, $columnName = null)
{
$pk = $this->primaryKey($tableName);
if (count($pk->columns) == 1 &&
(!$columnName || $pk->columns[0] == $columnName)) {
$prefix = $tableName . '_' . $pk->columns[0];
try {
$this->execute(sprintf(
'DROP SEQUENCE %s',
$this->quoteColumnName($this->_truncate($prefix . '_seq'))
));
} catch (Horde_Db_Exception $e) {
}
try {
$this->execute(sprintf(
'DROP TRIGGER %s',
$this->quoteColumnName($this->_truncate($prefix . '_trig'))
));
} catch (Horde_Db_Exception $e) {
}
}
}
/**
* Sets a new default value for a column.
*
* If you want to set the default value to NULL, you are out of luck. You
* need to execute the apppropriate SQL statement yourself.
*
* @param string $tableName A table name.
* @param string $columnName A column name.
* @param mixed $default The new default value.
*/
public function changeColumnDefault($tableName, $columnName, $default)
{
$this->_clearTableCache($tableName);
$sql = sprintf('ALTER TABLE %s MODIFY (%s DEFAULT %s)',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName),
$this->quote($default));
return $this->execute($sql);
}
/**
* Renames a column.
*
* @param string $tableName A table name.
* @param string $columnName A column name.
* @param string $newColumnName The new column name.
*/
public function renameColumn($tableName, $columnName, $newColumnName)
{
$this->_clearTableCache($tableName);
$sql = sprintf('ALTER TABLE %s RENAME COLUMN %s TO %s',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName),
$this->quoteColumnName($newColumnName));
return $this->execute($sql);
}
/**
* Removes a primary key from a table.
*
* @param string $tableName A table name.
*
* @throws Horde_Db_Exception
*/
public function removePrimaryKey($tableName)
{
$this->_clearTableCache($tableName);
$sql = sprintf('ALTER TABLE %s DROP PRIMARY KEY',
$this->quoteTableName($tableName));
return $this->execute($sql);
}
/**
* Removes an index from a table.
*
* @param string $tableName A table name.
* @param string|array $options Either a column name or index options:
* - name: (string) the index name.
* - column: (string|array) column name(s).
*/
public function removeIndex($tableName, $options = array())
{
$this->_clearTableCache($tableName);
$index = $this->indexName($tableName, $options);
$sql = sprintf('DROP INDEX %s',
$this->quoteColumnName($index));
return $this->execute($sql);
}
/**
* Builds the name for an index.
*
* Cuts the index name to the maximum length of 30 characters limited by
* Oracle.
*
* @param string $tableName A table name.
* @param string|array $options Either a column name or index options:
* - column: (string|array) column name(s).
* - name: (string) the index name to fall
* back to if no column names specified.
*/
public function indexName($tableName, $options = array())
{
$index = parent::indexName($tableName, $options);
if (strlen($index) <= 30) {
return $index;
}
if (isset($options['name']) && $index == $options['name']) {
return $this->_truncate($index);
}
return substr('ind_' . $this->_truncate($tableName, 15) . '_' . hash('crc32', $index), 0, 30);
}
/**
* Creates a database.
*
* @param string $name A database name.
* @param array $options Database options.
*/
public function createDatabase($name, $options = array())
{
return $this->execute(sprintf('CREATE DATABASE %s', $this->quoteTableName($name)));
}
/**
* Drops a database.
*
* @param string $name A database name.
*/
public function dropDatabase($name)
{
if ($this->currentDatabase() != $name) {
throw new Horde_Db_Exception('Oracle can only drop the current database');
}
return $this->execute('DROP DATABASE');
}
/**
* Returns the name of the currently selected database.
*
* @return string The database name.
*/
public function currentDatabase()
{
return $this->selectValue("SELECT SYS_CONTEXT('USERENV', 'CURRENT_SCHEMA') FROM DUAL");
}
/**
* Adds default/null options to column SQL definitions.
*
* @param string $sql Existing SQL definition for a column.
* @param array $options Column options:
* - column: (Horde_Db_Adapter_Base_ColumnDefinition
* The column definition class.
* - null: (boolean) Whether to allow NULL values.
* - default: (mixed) Default column value.
* - autoincrement: (boolean) Whether the column is
* an autoincrement column. Driver depedendent.
*
* @return string The manipulated SQL definition.
*/
public function addColumnOptions($sql, $options)
{
/* 'autoincrement' is not handled here - it varies too much between
* DBs. Do autoincrement-specific handling in the driver. */
if (isset($options['default'])) {
$default = $options['default'];
$column = isset($options['column']) ? $options['column'] : null;
$sql .= ' DEFAULT ' . $this->quote($default, $column);
}
if (isset($options['null']) &&
(!isset($options['column']) ||
($options['column']->getType() != 'text' &&
$options['column']->getType() != 'binary'))) {
if ($options['null']) {
$sql .= ' NULL';
} else {
$sql .= ' NOT NULL';
}
}
return $sql;
}
/**
* Returns an expression using the specified operator.
*
* @param string $lhs The column or expression to test.
* @param string $op The operator.
* @param string $rhs The comparison value.
* @param boolean $bind If true, the method returns the query and a list
* of values suitable for binding as an array.
* @param array $params Any additional parameters for the operator.
*
* @return string|array The SQL test fragment, or an array containing the
* query and a list of values if $bind is true.
*/
public function buildClause($lhs, $op, $rhs, $bind = false,
$params = array())
{
$lhs = $this->_escapePrepare($lhs);
switch ($op) {
case '|':
if ($bind) {
return array($lhs . ' + ? - BITAND(' . $lhs . ', ?)',
array((int)$rhs, (int)$rhs));
}
return $lhs . ' + ' . (int)$rhs . ' - BITAND(' . $lhs . ', ' . (int)$rhs . ')';
case '&':
if ($bind) {
return array('BITAND(' . $lhs . ', ?)',
array((int)$rhs));
}
return 'BITAND(' . $lhs . ', ' . (int)$rhs . ')';
}
return parent::buildClause($lhs, $op, $rhs, $bind, $params);
}
/*##########################################################################
# Protected
##########################################################################*/
/**
* Clears the cache for tables when altering them.
*
* @param string $tableName A table name.
*/
protected function _clearTableCache($tableName)
{
parent::_clearTableCache($tableName);
$this->cacheWrite('tables/primarykeys/' . $tableName, '');
}
/**
* Truncates an indentifier to a certain length.
*
* To avoid collisions, the identifier is split up by underscores and the
* parts truncated to 3 characters first.
*
* @param string $name An identifier.
* @param integer $length The maximum length.
*
* @return string The truncated identifier.
*/
protected function _truncate($name, $length = 30)
{
if (strlen($name) > $length) {
$name = implode(
'_',
array_map(
function($t)
{
return substr($t, 0, 3);
},
explode('_', $name)
)
);
}
return substr($name, 0, $length);
}
}
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