我們開始分析database/DB_active_rec.php。
ar_select[] = $val;
$this->ar_no_escape[] = $escape;
if ($this->ar_caching === TRUE)
{
$this->ar_cache_select[] = $val;
$this->ar_cache_exists[] = 'select';
$this->ar_cache_no_escape[] = $escape;
}
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* Select Max
*
* Generates a SELECT MAX(field) portion of a query
*
* @param string the field
* @param string an alias
* @return object
*/
public function select_max($select = '', $alias = '')
{
return $this->_max_min_avg_sum($select, $alias, 'MAX');
}
// --------------------------------------------------------------------
/**
* Select Min
*
* Generates a SELECT MIN(field) portion of a query
*
* @param string the field
* @param string an alias
* @return object
*/
public function select_min($select = '', $alias = '')
{
return $this->_max_min_avg_sum($select, $alias, 'MIN');
}
// --------------------------------------------------------------------
/**
* Select Average
*
* Generates a SELECT AVG(field) portion of a query
*
* @param string the field
* @param string an alias
* @return object
*/
public function select_avg($select = '', $alias = '')
{
return $this->_max_min_avg_sum($select, $alias, 'AVG');
}
// --------------------------------------------------------------------
/**
* Select Sum
*
* Generates a SELECT SUM(field) portion of a query
*
* @param string the field
* @param string an alias
* @return object
*/
public function select_sum($select = '', $alias = '')
{
return $this->_max_min_avg_sum($select, $alias, 'SUM');
}
// --------------------------------------------------------------------
/**
* Processing Function for the four functions above:
*
* select_max()
* select_min()
* select_avg()
* select_sum()
*
* @param string the field
* @param string an alias
* @return object
*/
protected function _max_min_avg_sum($select = '', $alias = '', $type = 'MAX')
{
if ( ! is_string($select) OR $select == '')
{
$this->display_error('db_invalid_query');
}
$type = strtoupper($type);
if ( ! in_array($type, array('MAX', 'MIN', 'AVG', 'SUM')))
{
show_error('Invalid function type: '.$type);
}
if ($alias == '')
{
$alias = $this->_create_alias_from_table(trim($select));
}
$sql = $type.'('.$this->_protect_identifiers(trim($select)).') AS '.$alias;
$this->ar_select[] = $sql;
if ($this->ar_caching === TRUE)
{
$this->ar_cache_select[] = $sql;
$this->ar_cache_exists[] = 'select';
}
return $this;
}
// --------------------------------------------------------------------
/**
* Determines the alias name based on the table
*
* @param string
* @return string
*/
protected function _create_alias_from_table($item)
{
if (strpos($item, '.') !== FALSE)
{
return end(explode('.', $item));
}
return $item;
}
// --------------------------------------------------------------------
/**
* DISTINCT
*
* Sets a flag which tells the query string compiler to add DISTINCT
*
* @param bool
* @return object
*/
public function distinct($val = TRUE)
{
$this->ar_distinct = (is_bool($val)) ? $val : TRUE;
return $this;
}
// --------------------------------------------------------------------
/**
* From
*
* Generates the FROM portion of the query
*
* @param mixed can be a string or array
* @return object
*/
public function from($from)
{
foreach ((array) $from as $val)
{
if (strpos($val, ',') !== FALSE)
{
foreach (explode(',', $val) as $v)
{
$v = trim($v);
$this->_track_aliases($v);
$this->ar_from[] = $this->_protect_identifiers($v, TRUE, NULL, FALSE);
if ($this->ar_caching === TRUE)
{
$this->ar_cache_from[] = $this->_protect_identifiers($v, TRUE, NULL, FALSE);
$this->ar_cache_exists[] = 'from';
}
}
}
else
{
$val = trim($val);
// Extract any aliases that might exist. We use this information
// in the _protect_identifiers to know whether to add a table prefix
$this->_track_aliases($val);
$this->ar_from[] = $this->_protect_identifiers($val, TRUE, NULL, FALSE);
if ($this->ar_caching === TRUE)
{
$this->ar_cache_from[] = $this->_protect_identifiers($val, TRUE, NULL, FALSE);
$this->ar_cache_exists[] = 'from';
}
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* Join
*
* Generates the JOIN portion of the query
*
* @param string
* @param string the join condition
* @param string the type of join
* @return object
*/
public function join($table, $cond, $type = '')
{
if ($type != '')
{
$type = strtoupper(trim($type));
if ( ! in_array($type, array('LEFT', 'RIGHT', 'OUTER', 'INNER', 'LEFT OUTER', 'RIGHT OUTER')))
{
$type = '';
}
else
{
$type .= ' ';
}
}
// Extract any aliases that might exist. We use this information
// in the _protect_identifiers to know whether to add a table prefix
$this->_track_aliases($table);
// Strip apart the condition and protect the identifiers
if (preg_match('/([\w\.]+)([\W\s]+)(.+)/', $cond, $match))
{
$match[1] = $this->_protect_identifiers($match[1]);
$match[3] = $this->_protect_identifiers($match[3]);
$cond = $match[1].$match[2].$match[3];
}
// Assemble the JOIN statement
$join = $type.'JOIN '.$this->_protect_identifiers($table, TRUE, NULL, FALSE).' ON '.$cond;
$this->ar_join[] = $join;
if ($this->ar_caching === TRUE)
{
$this->ar_cache_join[] = $join;
$this->ar_cache_exists[] = 'join';
}
return $this;
}
// --------------------------------------------------------------------
/**
* Where
*
* Generates the WHERE portion of the query. Separates
* multiple calls with AND
*
* @param mixed
* @param mixed
* @return object
*/
public function where($key, $value = NULL, $escape = TRUE)
{
return $this->_where($key, $value, 'AND ', $escape);
}
// --------------------------------------------------------------------
/**
* OR Where
*
* Generates the WHERE portion of the query. Separates
* multiple calls with OR
*
* @param mixed
* @param mixed
* @return object
*/
public function or_where($key, $value = NULL, $escape = TRUE)
{
return $this->_where($key, $value, 'OR ', $escape);
}
// --------------------------------------------------------------------
/**
* Where
*
* Called by where() or or_where()
*
* @param mixed
* @param mixed
* @param string
* @return object
*/
protected function _where($key, $value = NULL, $type = 'AND ', $escape = NULL)
{
if ( ! is_array($key))
{
$key = array($key => $value);
}
// If the escape value was not set will will base it on the global setting
if ( ! is_bool($escape))
{
$escape = $this->_protect_identifiers;
}
foreach ($key as $k => $v)
{
$prefix = (count($this->ar_where) == 0 AND count($this->ar_cache_where) == 0) ? '' : $type;
if (is_null($v) && ! $this->_has_operator($k))
{
// value appears not to have been set, assign the test to IS NULL
$k .= ' IS NULL';
}
if ( ! is_null($v))
{
if ($escape === TRUE)
{
$k = $this->_protect_identifiers($k, FALSE, $escape);
$v = ' '.$this->escape($v);
}
if ( ! $this->_has_operator($k))
{
$k .= ' = ';
}
}
else
{
$k = $this->_protect_identifiers($k, FALSE, $escape);
}
$this->ar_where[] = $prefix.$k.$v;
if ($this->ar_caching === TRUE)
{
$this->ar_cache_where[] = $prefix.$k.$v;
$this->ar_cache_exists[] = 'where';
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* Where_in
*
* Generates a WHERE field IN ('item', 'item') SQL query joined with
* AND if appropriate
*
* @param string The field to search
* @param array The values searched on
* @return object
*/
public function where_in($key = NULL, $values = NULL)
{
return $this->_where_in($key, $values);
}
// --------------------------------------------------------------------
/**
* Where_in_or
*
* Generates a WHERE field IN ('item', 'item') SQL query joined with
* OR if appropriate
*
* @param string The field to search
* @param array The values searched on
* @return object
*/
public function or_where_in($key = NULL, $values = NULL)
{
return $this->_where_in($key, $values, FALSE, 'OR ');
}
// --------------------------------------------------------------------
/**
* Where_not_in
*
* Generates a WHERE field NOT IN ('item', 'item') SQL query joined
* with AND if appropriate
*
* @param string The field to search
* @param array The values searched on
* @return object
*/
public function where_not_in($key = NULL, $values = NULL)
{
return $this->_where_in($key, $values, TRUE);
}
// --------------------------------------------------------------------
/**
* Where_not_in_or
*
* Generates a WHERE field NOT IN ('item', 'item') SQL query joined
* with OR if appropriate
*
* @param string The field to search
* @param array The values searched on
* @return object
*/
public function or_where_not_in($key = NULL, $values = NULL)
{
return $this->_where_in($key, $values, TRUE, 'OR ');
}
// --------------------------------------------------------------------
/**
* Where_in
*
* Called by where_in, where_in_or, where_not_in, where_not_in_or
*
* @param string The field to search
* @param array The values searched on
* @param boolean If the statement would be IN or NOT IN
* @param string
* @return object
*/
protected function _where_in($key = NULL, $values = NULL, $not = FALSE, $type = 'AND ')
{
if ($key === NULL OR $values === NULL)
{
return;
}
if ( ! is_array($values))
{
$values = array($values);
}
$not = ($not) ? ' NOT' : '';
foreach ($values as $value)
{
$this->ar_wherein[] = $this->escape($value);
}
$prefix = (count($this->ar_where) == 0) ? '' : $type;
$where_in = $prefix . $this->_protect_identifiers($key) . $not . " IN (" . implode(", ", $this->ar_wherein) . ") ";
$this->ar_where[] = $where_in;
if ($this->ar_caching === TRUE)
{
$this->ar_cache_where[] = $where_in;
$this->ar_cache_exists[] = 'where';
}
// reset the array for multiple calls
$this->ar_wherein = array();
return $this;
}
// --------------------------------------------------------------------
/**
* Like
*
* Generates a %LIKE% portion of the query. Separates
* multiple calls with AND
*
* @param mixed
* @param mixed
* @return object
*/
public function like($field, $match = '', $side = 'both')
{
return $this->_like($field, $match, 'AND ', $side);
}
// --------------------------------------------------------------------
/**
* Not Like
*
* Generates a NOT LIKE portion of the query. Separates
* multiple calls with AND
*
* @param mixed
* @param mixed
* @return object
*/
public function not_like($field, $match = '', $side = 'both')
{
return $this->_like($field, $match, 'AND ', $side, 'NOT');
}
// --------------------------------------------------------------------
/**
* OR Like
*
* Generates a %LIKE% portion of the query. Separates
* multiple calls with OR
*
* @param mixed
* @param mixed
* @return object
*/
public function or_like($field, $match = '', $side = 'both')
{
return $this->_like($field, $match, 'OR ', $side);
}
// --------------------------------------------------------------------
/**
* OR Not Like
*
* Generates a NOT LIKE portion of the query. Separates
* multiple calls with OR
*
* @param mixed
* @param mixed
* @return object
*/
public function or_not_like($field, $match = '', $side = 'both')
{
return $this->_like($field, $match, 'OR ', $side, 'NOT');
}
// --------------------------------------------------------------------
/**
* Like
*
* Called by like() or orlike()
*
* @param mixed
* @param mixed
* @param string
* @return object
*/
protected function _like($field, $match = '', $type = 'AND ', $side = 'both', $not = '')
{
if ( ! is_array($field))
{
$field = array($field => $match);
}
foreach ($field as $k => $v)
{
$k = $this->_protect_identifiers($k);
$prefix = (count($this->ar_like) == 0) ? '' : $type;
$v = $this->escape_like_str($v);
if ($side == 'none')
{
$like_statement = $prefix." $k $not LIKE '{$v}'";
}
elseif ($side == 'before')
{
$like_statement = $prefix." $k $not LIKE '%{$v}'";
}
elseif ($side == 'after')
{
$like_statement = $prefix." $k $not LIKE '{$v}%'";
}
else
{
$like_statement = $prefix." $k $not LIKE '%{$v}%'";
}
// some platforms require an escape sequence definition for LIKE wildcards
if ($this->_like_escape_str != '')
{
$like_statement = $like_statement.sprintf($this->_like_escape_str, $this->_like_escape_chr);
}
$this->ar_like[] = $like_statement;
if ($this->ar_caching === TRUE)
{
$this->ar_cache_like[] = $like_statement;
$this->ar_cache_exists[] = 'like';
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* GROUP BY
*
* @param string
* @return object
*/
public function group_by($by)
{
if (is_string($by))
{
$by = explode(',', $by);
}
foreach ($by as $val)
{
$val = trim($val);
if ($val != '')
{
$this->ar_groupby[] = $this->_protect_identifiers($val);
if ($this->ar_caching === TRUE)
{
$this->ar_cache_groupby[] = $this->_protect_identifiers($val);
$this->ar_cache_exists[] = 'groupby';
}
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* Sets the HAVING value
*
* Separates multiple calls with AND
*
* @param string
* @param string
* @return object
*/
public function having($key, $value = '', $escape = TRUE)
{
return $this->_having($key, $value, 'AND ', $escape);
}
// --------------------------------------------------------------------
/**
* Sets the OR HAVING value
*
* Separates multiple calls with OR
*
* @param string
* @param string
* @return object
*/
public function or_having($key, $value = '', $escape = TRUE)
{
return $this->_having($key, $value, 'OR ', $escape);
}
// --------------------------------------------------------------------
/**
* Sets the HAVING values
*
* Called by having() or or_having()
*
* @param string
* @param string
* @return object
*/
protected function _having($key, $value = '', $type = 'AND ', $escape = TRUE)
{
if ( ! is_array($key))
{
$key = array($key => $value);
}
foreach ($key as $k => $v)
{
$prefix = (count($this->ar_having) == 0) ? '' : $type;
if ($escape === TRUE)
{
$k = $this->_protect_identifiers($k);
}
if ( ! $this->_has_operator($k))
{
$k .= ' = ';
}
if ($v != '')
{
$v = ' '.$this->escape($v);
}
$this->ar_having[] = $prefix.$k.$v;
if ($this->ar_caching === TRUE)
{
$this->ar_cache_having[] = $prefix.$k.$v;
$this->ar_cache_exists[] = 'having';
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* Sets the ORDER BY value
*
* @param string
* @param string direction: asc or desc
* @return object
*/
public function order_by($orderby, $direction = '')
{
if (strtolower($direction) == 'random')
{
$orderby = ''; // Random results want or don't need a field name
$direction = $this->_random_keyword;
}
elseif (trim($direction) != '')
{
$direction = (in_array(strtoupper(trim($direction)), array('ASC', 'DESC'), TRUE)) ? ' '.$direction : ' ASC';
}
if (strpos($orderby, ',') !== FALSE)
{
$temp = array();
foreach (explode(',', $orderby) as $part)
{
$part = trim($part);
if ( ! in_array($part, $this->ar_aliased_tables))
{
$part = $this->_protect_identifiers(trim($part));
}
$temp[] = $part;
}
$orderby = implode(', ', $temp);
}
else if ($direction != $this->_random_keyword)
{
$orderby = $this->_protect_identifiers($orderby);
}
$orderby_statement = $orderby.$direction;
$this->ar_orderby[] = $orderby_statement;
if ($this->ar_caching === TRUE)
{
$this->ar_cache_orderby[] = $orderby_statement;
$this->ar_cache_exists[] = 'orderby';
}
return $this;
}
// --------------------------------------------------------------------
/**
* Sets the LIMIT value
*
* @param integer the limit value
* @param integer the offset value
* @return object
*/
public function limit($value, $offset = '')
{
$this->ar_limit = (int) $value;
if ($offset != '')
{
$this->ar_offset = (int) $offset;
}
return $this;
}
// --------------------------------------------------------------------
/**
* Sets the OFFSET value
*
* @param integer the offset value
* @return object
*/
public function offset($offset)
{
$this->ar_offset = $offset;
return $this;
}
// --------------------------------------------------------------------
/**
* The "set" function. Allows key/value pairs to be set for inserting or updating
*
* @param mixed
* @param string
* @param boolean
* @return object
*/
public function set($key, $value = '', $escape = TRUE)
{
$key = $this->_object_to_array($key);
if ( ! is_array($key))
{
$key = array($key => $value);
}
foreach ($key as $k => $v)
{
if ($escape === FALSE)
{
$this->ar_set[$this->_protect_identifiers($k)] = $v;
}
else
{
$this->ar_set[$this->_protect_identifiers($k, FALSE, TRUE)] = $this->escape($v);
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* Get
*
* Compiles the select statement based on the other functions called
* and runs the query
*
* @param string the table
* @param string the limit clause
* @param string the offset clause
* @return object
*/
public function get($table = '', $limit = null, $offset = null)
{
if ($table != '')
{
$this->_track_aliases($table);
$this->from($table);
}
if ( ! is_null($limit))
{
$this->limit($limit, $offset);
}
$sql = $this->_compile_select();
$result = $this->query($sql);
$this->_reset_select();
return $result;
}
/**
* "Count All Results" query
*
* Generates a platform-specific query string that counts all records
* returned by an Active Record query.
*
* @param string
* @return string
*/
public function count_all_results($table = '')
{
if ($table != '')
{
$this->_track_aliases($table);
$this->from($table);
}
$sql = $this->_compile_select($this->_count_string . $this->_protect_identifiers('numrows'));
$query = $this->query($sql);
$this->_reset_select();
if ($query->num_rows() == 0)
{
return 0;
}
$row = $query->row();
return (int) $row->numrows;
}
// --------------------------------------------------------------------
/**
* Get_Where
*
* Allows the where clause, limit and offset to be added directly
*
* @param string the where clause
* @param string the limit clause
* @param string the offset clause
* @return object
*/
public function get_where($table = '', $where = null, $limit = null, $offset = null)
{
if ($table != '')
{
$this->from($table);
}
if ( ! is_null($where))
{
$this->where($where);
}
if ( ! is_null($limit))
{
$this->limit($limit, $offset);
}
$sql = $this->_compile_select();
$result = $this->query($sql);
$this->_reset_select();
return $result;
}
// --------------------------------------------------------------------
/**
* Insert_Batch
*
* Compiles batch insert strings and runs the queries
*
* @param string the table to retrieve the results from
* @param array an associative array of insert values
* @return object
*/
public function insert_batch($table = '', $set = NULL)
{
if ( ! is_null($set))
{
$this->set_insert_batch($set);
}
if (count($this->ar_set) == 0)
{
if ($this->db_debug)
{
//No valid data array. Folds in cases where keys and values did not match up
return $this->display_error('db_must_use_set');
}
return FALSE;
}
if ($table == '')
{
if ( ! isset($this->ar_from[0]))
{
if ($this->db_debug)
{
return $this->display_error('db_must_set_table');
}
return FALSE;
}
$table = $this->ar_from[0];
}
// Batch this baby
for ($i = 0, $total = count($this->ar_set); $i < $total; $i = $i + 100)
{
$sql = $this->_insert_batch($this->_protect_identifiers($table, TRUE, NULL, FALSE), $this->ar_keys, array_slice($this->ar_set, $i, 100));
//echo $sql;
$this->query($sql);
}
$this->_reset_write();
return TRUE;
}
// --------------------------------------------------------------------
/**
* The "set_insert_batch" function. Allows key/value pairs to be set for batch inserts
*
* @param mixed
* @param string
* @param boolean
* @return object
*/
public function set_insert_batch($key, $value = '', $escape = TRUE)
{
$key = $this->_object_to_array_batch($key);
if ( ! is_array($key))
{
$key = array($key => $value);
}
$keys = array_keys(current($key));
sort($keys);
foreach ($key as $row)
{
if (count(array_diff($keys, array_keys($row))) > 0 OR count(array_diff(array_keys($row), $keys)) > 0)
{
// batch function above returns an error on an empty array
$this->ar_set[] = array();
return;
}
ksort($row); // puts $row in the same order as our keys
if ($escape === FALSE)
{
$this->ar_set[] = '('.implode(',', $row).')';
}
else
{
$clean = array();
foreach ($row as $value)
{
$clean[] = $this->escape($value);
}
$this->ar_set[] = '('.implode(',', $clean).')';
}
}
foreach ($keys as $k)
{
$this->ar_keys[] = $this->_protect_identifiers($k);
}
return $this;
}
// --------------------------------------------------------------------
/**
* Insert
*
* Compiles an insert string and runs the query
*
* @param string the table to insert data into
* @param array an associative array of insert values
* @return object
*/
function insert($table = '', $set = NULL)
{
if ( ! is_null($set))
{
$this->set($set);
}
if (count($this->ar_set) == 0)
{
if ($this->db_debug)
{
return $this->display_error('db_must_use_set');
}
return FALSE;
}
if ($table == '')
{
if ( ! isset($this->ar_from[0]))
{
if ($this->db_debug)
{
return $this->display_error('db_must_set_table');
}
return FALSE;
}
$table = $this->ar_from[0];
}
$sql = $this->_insert($this->_protect_identifiers($table, TRUE, NULL, FALSE), array_keys($this->ar_set), array_values($this->ar_set));
$this->_reset_write();
return $this->query($sql);
}
// --------------------------------------------------------------------
/**
* Replace
*
* Compiles an replace into string and runs the query
*
* @param string the table to replace data into
* @param array an associative array of insert values
* @return object
*/
public function replace($table = '', $set = NULL)
{
if ( ! is_null($set))
{
$this->set($set);
}
if (count($this->ar_set) == 0)
{
if ($this->db_debug)
{
return $this->display_error('db_must_use_set');
}
return FALSE;
}
if ($table == '')
{
if ( ! isset($this->ar_from[0]))
{
if ($this->db_debug)
{
return $this->display_error('db_must_set_table');
}
return FALSE;
}
$table = $this->ar_from[0];
}
$sql = $this->_replace($this->_protect_identifiers($table, TRUE, NULL, FALSE), array_keys($this->ar_set), array_values($this->ar_set));
$this->_reset_write();
return $this->query($sql);
}
// --------------------------------------------------------------------
/**
* Update
*
* Compiles an update string and runs the query
*
* @param string the table to retrieve the results from
* @param array an associative array of update values
* @param mixed the where clause
* @return object
*/
public function update($table = '', $set = NULL, $where = NULL, $limit = NULL)
{
// Combine any cached components with the current statements
$this->_merge_cache();
if ( ! is_null($set))
{
$this->set($set);
}
if (count($this->ar_set) == 0)
{
if ($this->db_debug)
{
return $this->display_error('db_must_use_set');
}
return FALSE;
}
if ($table == '')
{
if ( ! isset($this->ar_from[0]))
{
if ($this->db_debug)
{
return $this->display_error('db_must_set_table');
}
return FALSE;
}
$table = $this->ar_from[0];
}
if ($where != NULL)
{
$this->where($where);
}
if ($limit != NULL)
{
$this->limit($limit);
}
$sql = $this->_update($this->_protect_identifiers($table, TRUE, NULL, FALSE), $this->ar_set, $this->ar_where, $this->ar_orderby, $this->ar_limit);
$this->_reset_write();
return $this->query($sql);
}
// --------------------------------------------------------------------
/**
* Update_Batch
*
* Compiles an update string and runs the query
*
* @param string the table to retrieve the results from
* @param array an associative array of update values
* @param string the where key
* @return object
*/
public function update_batch($table = '', $set = NULL, $index = NULL)
{
// Combine any cached components with the current statements
$this->_merge_cache();
if (is_null($index))
{
if ($this->db_debug)
{
return $this->display_error('db_must_use_index');
}
return FALSE;
}
if ( ! is_null($set))
{
$this->set_update_batch($set, $index);
}
if (count($this->ar_set) == 0)
{
if ($this->db_debug)
{
return $this->display_error('db_must_use_set');
}
return FALSE;
}
if ($table == '')
{
if ( ! isset($this->ar_from[0]))
{
if ($this->db_debug)
{
return $this->display_error('db_must_set_table');
}
return FALSE;
}
$table = $this->ar_from[0];
}
// Batch this baby
for ($i = 0, $total = count($this->ar_set); $i < $total; $i = $i + 100)
{
$sql = $this->_update_batch($this->_protect_identifiers($table, TRUE, NULL, FALSE), array_slice($this->ar_set, $i, 100), $this->_protect_identifiers($index), $this->ar_where);
$this->query($sql);
}
$this->_reset_write();
}
// --------------------------------------------------------------------
/**
* The "set_update_batch" function. Allows key/value pairs to be set for batch updating
*
* @param array
* @param string
* @param boolean
* @return object
*/
public function set_update_batch($key, $index = '', $escape = TRUE)
{
$key = $this->_object_to_array_batch($key);
if ( ! is_array($key))
{
// @todo error
}
foreach ($key as $k => $v)
{
$index_set = FALSE;
$clean = array();
foreach ($v as $k2 => $v2)
{
if ($k2 == $index)
{
$index_set = TRUE;
}
else
{
$not[] = $k2.'-'.$v2;
}
if ($escape === FALSE)
{
$clean[$this->_protect_identifiers($k2)] = $v2;
}
else
{
$clean[$this->_protect_identifiers($k2)] = $this->escape($v2);
}
}
if ($index_set == FALSE)
{
return $this->display_error('db_batch_missing_index');
}
$this->ar_set[] = $clean;
}
return $this;
}
// --------------------------------------------------------------------
/**
* Empty Table
*
* Compiles a delete string and runs "DELETE FROM table"
*
* @param string the table to empty
* @return object
*/
public function empty_table($table = '')
{
if ($table == '')
{
if ( ! isset($this->ar_from[0]))
{
if ($this->db_debug)
{
return $this->display_error('db_must_set_table');
}
return FALSE;
}
$table = $this->ar_from[0];
}
else
{
$table = $this->_protect_identifiers($table, TRUE, NULL, FALSE);
}
$sql = $this->_delete($table);
$this->_reset_write();
return $this->query($sql);
}
// --------------------------------------------------------------------
/**
* Truncate
*
* Compiles a truncate string and runs the query
* If the database does not support the truncate() command
* This function maps to "DELETE FROM table"
*
* @param string the table to truncate
* @return object
*/
public function truncate($table = '')
{
if ($table == '')
{
if ( ! isset($this->ar_from[0]))
{
if ($this->db_debug)
{
return $this->display_error('db_must_set_table');
}
return FALSE;
}
$table = $this->ar_from[0];
}
else
{
$table = $this->_protect_identifiers($table, TRUE, NULL, FALSE);
}
$sql = $this->_truncate($table);
$this->_reset_write();
return $this->query($sql);
}
// --------------------------------------------------------------------
/**
* Delete
*
* Compiles a delete string and runs the query
*
* @param mixed the table(s) to delete from. String or array
* @param mixed the where clause
* @param mixed the limit clause
* @param boolean
* @return object
*/
public function delete($table = '', $where = '', $limit = NULL, $reset_data = TRUE)
{
// Combine any cached components with the current statements
$this->_merge_cache();
if ($table == '')
{
if ( ! isset($this->ar_from[0]))
{
if ($this->db_debug)
{
return $this->display_error('db_must_set_table');
}
return FALSE;
}
$table = $this->ar_from[0];
}
elseif (is_array($table))
{
foreach ($table as $single_table)
{
$this->delete($single_table, $where, $limit, FALSE);
}
$this->_reset_write();
return;
}
else
{
$table = $this->_protect_identifiers($table, TRUE, NULL, FALSE);
}
if ($where != '')
{
$this->where($where);
}
if ($limit != NULL)
{
$this->limit($limit);
}
if (count($this->ar_where) == 0 && count($this->ar_wherein) == 0 && count($this->ar_like) == 0)
{
if ($this->db_debug)
{
return $this->display_error('db_del_must_use_where');
}
return FALSE;
}
$sql = $this->_delete($table, $this->ar_where, $this->ar_like, $this->ar_limit);
if ($reset_data)
{
$this->_reset_write();
}
return $this->query($sql);
}
// --------------------------------------------------------------------
/**
* DB Prefix
*
* Prepends a database prefix if one exists in configuration
*
* @param string the table
* @return string
*/
public function dbprefix($table = '')
{
if ($table == '')
{
$this->display_error('db_table_name_required');
}
return $this->dbprefix.$table;
}
// --------------------------------------------------------------------
/**
* Set DB Prefix
*
* Set's the DB Prefix to something new without needing to reconnect
*
* @param string the prefix
* @return string
*/
public function set_dbprefix($prefix = '')
{
return $this->dbprefix = $prefix;
}
// --------------------------------------------------------------------
/**
* Track Aliases
*
* Used to track SQL statements written with aliased tables.
*
* @param string The table to inspect
* @return string
*/
protected function _track_aliases($table)
{
if (is_array($table))
{
foreach ($table as $t)
{
$this->_track_aliases($t);
}
return;
}
// Does the string contain a comma? If so, we need to separate
// the string into discreet statements
if (strpos($table, ',') !== FALSE)
{
return $this->_track_aliases(explode(',', $table));
}
// if a table alias is used we can recognize it by a space
if (strpos($table, " ") !== FALSE)
{
// if the alias is written with the AS keyword, remove it
$table = preg_replace('/\s+AS\s+/i', ' ', $table);
// Grab the alias
$table = trim(strrchr($table, " "));
// Store the alias, if it doesn't already exist
if ( ! in_array($table, $this->ar_aliased_tables))
{
$this->ar_aliased_tables[] = $table;
}
}
}
// --------------------------------------------------------------------
/**
* Compile the SELECT statement
*
* Generates a query string based on which functions were used.
* Should not be called directly. The get() function calls it.
*
* @return string
*/
protected function _compile_select($select_override = FALSE)
{
// Combine any cached components with the current statements
$this->_merge_cache();
// ----------------------------------------------------------------
// Write the "select" portion of the query
if ($select_override !== FALSE)
{
$sql = $select_override;
}
else
{
$sql = ( ! $this->ar_distinct) ? 'SELECT ' : 'SELECT DISTINCT ';
if (count($this->ar_select) == 0)
{
$sql .= '*';
}
else
{
// Cycle through the "select" portion of the query and prep each column name.
// The reason we protect identifiers here rather then in the select() function
// is because until the user calls the from() function we don't know if there are aliases
foreach ($this->ar_select as $key => $val)
{
$no_escape = isset($this->ar_no_escape[$key]) ? $this->ar_no_escape[$key] : NULL;
$this->ar_select[$key] = $this->_protect_identifiers($val, FALSE, $no_escape);
}
$sql .= implode(', ', $this->ar_select);
}
}
// ----------------------------------------------------------------
// Write the "FROM" portion of the query
if (count($this->ar_from) > 0)
{
$sql .= "\nFROM ";
$sql .= $this->_from_tables($this->ar_from);
}
// ----------------------------------------------------------------
// Write the "JOIN" portion of the query
if (count($this->ar_join) > 0)
{
$sql .= "\n";
$sql .= implode("\n", $this->ar_join);
}
// ----------------------------------------------------------------
// Write the "WHERE" portion of the query
if (count($this->ar_where) > 0 OR count($this->ar_like) > 0)
{
$sql .= "\nWHERE ";
}
$sql .= implode("\n", $this->ar_where);
// ----------------------------------------------------------------
// Write the "LIKE" portion of the query
if (count($this->ar_like) > 0)
{
if (count($this->ar_where) > 0)
{
$sql .= "\nAND ";
}
$sql .= implode("\n", $this->ar_like);
}
// ----------------------------------------------------------------
// Write the "GROUP BY" portion of the query
if (count($this->ar_groupby) > 0)
{
$sql .= "\nGROUP BY ";
$sql .= implode(', ', $this->ar_groupby);
}
// ----------------------------------------------------------------
// Write the "HAVING" portion of the query
if (count($this->ar_having) > 0)
{
$sql .= "\nHAVING ";
$sql .= implode("\n", $this->ar_having);
}
// ----------------------------------------------------------------
// Write the "ORDER BY" portion of the query
if (count($this->ar_orderby) > 0)
{
$sql .= "\nORDER BY ";
$sql .= implode(', ', $this->ar_orderby);
if ($this->ar_order !== FALSE)
{
$sql .= ($this->ar_order == 'desc') ? ' DESC' : ' ASC';
}
}
// ----------------------------------------------------------------
// Write the "LIMIT" portion of the query
if (is_numeric($this->ar_limit))
{
$sql .= "\n";
$sql = $this->_limit($sql, $this->ar_limit, $this->ar_offset);
}
return $sql;
}
// --------------------------------------------------------------------
/**
* Object to Array
*
* Takes an object as input and converts the class variables to array key/vals
*
* @param object
* @return array
*/
public function _object_to_array($object)
{
if ( ! is_object($object))
{
return $object;
}
$array = array();
foreach (get_object_vars($object) as $key => $val)
{
// There are some built in keys we need to ignore for this conversion
if ( ! is_object($val) && ! is_array($val) && $key != '_parent_name')
{
$array[$key] = $val;
}
}
return $array;
}
// --------------------------------------------------------------------
/**
* Object to Array
*
* Takes an object as input and converts the class variables to array key/vals
*
* @param object
* @return array
*/
public function _object_to_array_batch($object)
{
if ( ! is_object($object))
{
return $object;
}
$array = array();
$out = get_object_vars($object);
$fields = array_keys($out);
foreach ($fields as $val)
{
// There are some built in keys we need to ignore for this conversion
if ($val != '_parent_name')
{
$i = 0;
foreach ($out[$val] as $data)
{
$array[$i][$val] = $data;
$i++;
}
}
}
return $array;
}
// --------------------------------------------------------------------
/**
* Start Cache
*
* Starts AR caching
*
* @return void
*/
public function start_cache()
{
$this->ar_caching = TRUE;
}
// --------------------------------------------------------------------
/**
* Stop Cache
*
* Stops AR caching
*
* @return void
*/
public function stop_cache()
{
$this->ar_caching = FALSE;
}
// --------------------------------------------------------------------
/**
* Flush Cache
*
* Empties the AR cache
*
* @access public
* @return void
*/
public function flush_cache()
{
$this->_reset_run(array(
'ar_cache_select' => array(),
'ar_cache_from' => array(),
'ar_cache_join' => array(),
'ar_cache_where' => array(),
'ar_cache_like' => array(),
'ar_cache_groupby' => array(),
'ar_cache_having' => array(),
'ar_cache_orderby' => array(),
'ar_cache_set' => array(),
'ar_cache_exists' => array(),
'ar_cache_no_escape' => array()
));
}
// --------------------------------------------------------------------
/**
* Merge Cache
*
* When called, this function merges any cached AR arrays with
* locally called ones.
*
* @return void
*/
protected function _merge_cache()
{
if (count($this->ar_cache_exists) == 0)
{
return;
}
foreach ($this->ar_cache_exists as $val)
{
$ar_variable = 'ar_'.$val;
$ar_cache_var = 'ar_cache_'.$val;
if (count($this->$ar_cache_var) == 0)
{
continue;
}
$this->$ar_variable = array_unique(array_merge($this->$ar_cache_var, $this->$ar_variable));
}
// If we are "protecting identifiers" we need to examine the "from"
// portion of the query to determine if there are any aliases
if ($this->_protect_identifiers === TRUE AND count($this->ar_cache_from) > 0)
{
$this->_track_aliases($this->ar_from);
}
$this->ar_no_escape = $this->ar_cache_no_escape;
}
// --------------------------------------------------------------------
/**
* Resets the active record values. Called by the get() function
*
* @param array An array of fields to reset
* @return void
*/
protected function _reset_run($ar_reset_items)
{
foreach ($ar_reset_items as $item => $default_value)
{
if ( ! in_array($item, $this->ar_store_array))
{
$this->$item = $default_value;
}
}
}
// --------------------------------------------------------------------
/**
* Resets the active record values. Called by the get() function
*
* @return void
*/
protected function _reset_select()
{
$ar_reset_items = array(
'ar_select' => array(),
'ar_from' => array(),
'ar_join' => array(),
'ar_where' => array(),
'ar_like' => array(),
'ar_groupby' => array(),
'ar_having' => array(),
'ar_orderby' => array(),
'ar_wherein' => array(),
'ar_aliased_tables' => array(),
'ar_no_escape' => array(),
'ar_distinct' => FALSE,
'ar_limit' => FALSE,
'ar_offset' => FALSE,
'ar_order' => FALSE,
);
$this->_reset_run($ar_reset_items);
}
// --------------------------------------------------------------------
/**
* Resets the active record "write" values.
*
* Called by the insert() update() insert_batch() update_batch() and delete() functions
*
* @return void
*/
protected function _reset_write()
{
$ar_reset_items = array(
'ar_set' => array(),
'ar_from' => array(),
'ar_where' => array(),
'ar_like' => array(),
'ar_orderby' => array(),
'ar_keys' => array(),
'ar_limit' => FALSE,
'ar_order' => FALSE
);
$this->_reset_run($ar_reset_items);
}
}
/* End of file DB_active_rec.php */
/* Location: ./system/database/DB_active_rec.php */
動態挑選driver類別，接著進行初始化。最後將這個driver實體回傳。