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<?php
/**
*
* @package dbal
* @version $Id: db_tools.php 9495 2009-04-29 13:41:49Z acydburn $
* @copyright (c) 2007 phpBB Group
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
exit;
}
/**
* Database Tools for handling cross-db actions such as altering columns, etc.
* Currently not supported is returning SQL for creating tables.
*
* @package dbal
* @note currently not used within phpBB3, but may be utilized later.
*/
class phpbb_db_tools
{
/**
* Current sql layer
*/
var $sql_layer = '';
/**
* @var object DB object
*/
var $db = NULL;
/**
* The Column types for every database we support
* @var array
*/
var $dbms_type_map = array(
'mysql_41' => array(
'INT:' => 'int(%d)',
'BINT' => 'bigint(20)',
'UINT' => 'mediumint(8) UNSIGNED',
'UINT:' => 'int(%d) UNSIGNED',
'TINT:' => 'tinyint(%d)',
'USINT' => 'smallint(4) UNSIGNED',
'BOOL' => 'tinyint(1) UNSIGNED',
'VCHAR' => 'varchar(255)',
'VCHAR:' => 'varchar(%d)',
'CHAR:' => 'char(%d)',
'XSTEXT' => 'text',
'XSTEXT_UNI'=> 'varchar(100)',
'STEXT' => 'text',
'STEXT_UNI' => 'varchar(255)',
'TEXT' => 'text',
'TEXT_UNI' => 'text',
'MTEXT' => 'mediumtext',
'MTEXT_UNI' => 'mediumtext',
'TIMESTAMP' => 'int(11) UNSIGNED',
'DECIMAL' => 'decimal(5,2)',
'DECIMAL:' => 'decimal(%d,2)',
'PDECIMAL' => 'decimal(6,3)',
'PDECIMAL:' => 'decimal(%d,3)',
'VCHAR_UNI' => 'varchar(255)',
'VCHAR_UNI:'=> 'varchar(%d)',
'VCHAR_CI' => 'varchar(255)',
'VARBINARY' => 'varbinary(255)',
),
'mysql_40' => array(
'INT:' => 'int(%d)',
'BINT' => 'bigint(20)',
'UINT' => 'mediumint(8) UNSIGNED',
'UINT:' => 'int(%d) UNSIGNED',
'TINT:' => 'tinyint(%d)',
'USINT' => 'smallint(4) UNSIGNED',
'BOOL' => 'tinyint(1) UNSIGNED',
'VCHAR' => 'varbinary(255)',
'VCHAR:' => 'varbinary(%d)',
'CHAR:' => 'binary(%d)',
'XSTEXT' => 'blob',
'XSTEXT_UNI'=> 'blob',
'STEXT' => 'blob',
'STEXT_UNI' => 'blob',
'TEXT' => 'blob',
'TEXT_UNI' => 'blob',
'MTEXT' => 'mediumblob',
'MTEXT_UNI' => 'mediumblob',
'TIMESTAMP' => 'int(11) UNSIGNED',
'DECIMAL' => 'decimal(5,2)',
'DECIMAL:' => 'decimal(%d,2)',
'PDECIMAL' => 'decimal(6,3)',
'PDECIMAL:' => 'decimal(%d,3)',
'VCHAR_UNI' => 'blob',
'VCHAR_UNI:'=> array('varbinary(%d)', 'limit' => array('mult', 3, 255, 'blob')),
'VCHAR_CI' => 'blob',
'VARBINARY' => 'varbinary(255)',
),
'firebird' => array(
'INT:' => 'INTEGER',
'BINT' => 'DOUBLE PRECISION',
'UINT' => 'INTEGER',
'UINT:' => 'INTEGER',
'TINT:' => 'INTEGER',
'USINT' => 'INTEGER',
'BOOL' => 'INTEGER',
'VCHAR' => 'VARCHAR(255) CHARACTER SET NONE',
'VCHAR:' => 'VARCHAR(%d) CHARACTER SET NONE',
'CHAR:' => 'CHAR(%d) CHARACTER SET NONE',
'XSTEXT' => 'BLOB SUB_TYPE TEXT CHARACTER SET NONE',
'STEXT' => 'BLOB SUB_TYPE TEXT CHARACTER SET NONE',
'TEXT' => 'BLOB SUB_TYPE TEXT CHARACTER SET NONE',
'MTEXT' => 'BLOB SUB_TYPE TEXT CHARACTER SET NONE',
'XSTEXT_UNI'=> 'VARCHAR(100) CHARACTER SET UTF8',
'STEXT_UNI' => 'VARCHAR(255) CHARACTER SET UTF8',
'TEXT_UNI' => 'BLOB SUB_TYPE TEXT CHARACTER SET UTF8',
'MTEXT_UNI' => 'BLOB SUB_TYPE TEXT CHARACTER SET UTF8',
'TIMESTAMP' => 'INTEGER',
'DECIMAL' => 'DOUBLE PRECISION',
'DECIMAL:' => 'DOUBLE PRECISION',
'PDECIMAL' => 'DOUBLE PRECISION',
'PDECIMAL:' => 'DOUBLE PRECISION',
'VCHAR_UNI' => 'VARCHAR(255) CHARACTER SET UTF8',
'VCHAR_UNI:'=> 'VARCHAR(%d) CHARACTER SET UTF8',
'VCHAR_CI' => 'VARCHAR(255) CHARACTER SET UTF8',
'VARBINARY' => 'CHAR(255) CHARACTER SET NONE',
),
'mssql' => array(
'INT:' => '[int]',
'BINT' => '[float]',
'UINT' => '[int]',
'UINT:' => '[int]',
'TINT:' => '[int]',
'USINT' => '[int]',
'BOOL' => '[int]',
'VCHAR' => '[varchar] (255)',
'VCHAR:' => '[varchar] (%d)',
'CHAR:' => '[char] (%d)',
'XSTEXT' => '[varchar] (1000)',
'STEXT' => '[varchar] (3000)',
'TEXT' => '[varchar] (8000)',
'MTEXT' => '[text]',
'XSTEXT_UNI'=> '[varchar] (100)',
'STEXT_UNI' => '[varchar] (255)',
'TEXT_UNI' => '[varchar] (4000)',
'MTEXT_UNI' => '[text]',
'TIMESTAMP' => '[int]',
'DECIMAL' => '[float]',
'DECIMAL:' => '[float]',
'PDECIMAL' => '[float]',
'PDECIMAL:' => '[float]',
'VCHAR_UNI' => '[varchar] (255)',
'VCHAR_UNI:'=> '[varchar] (%d)',
'VCHAR_CI' => '[varchar] (255)',
'VARBINARY' => '[varchar] (255)',
),
'oracle' => array(
'INT:' => 'number(%d)',
'BINT' => 'number(20)',
'UINT' => 'number(8)',
'UINT:' => 'number(%d)',
'TINT:' => 'number(%d)',
'USINT' => 'number(4)',
'BOOL' => 'number(1)',
'VCHAR' => 'varchar2(255)',
'VCHAR:' => 'varchar2(%d)',
'CHAR:' => 'char(%d)',
'XSTEXT' => 'varchar2(1000)',
'STEXT' => 'varchar2(3000)',
'TEXT' => 'clob',
'MTEXT' => 'clob',
'XSTEXT_UNI'=> 'varchar2(300)',
'STEXT_UNI' => 'varchar2(765)',
'TEXT_UNI' => 'clob',
'MTEXT_UNI' => 'clob',
'TIMESTAMP' => 'number(11)',
'DECIMAL' => 'number(5, 2)',
'DECIMAL:' => 'number(%d, 2)',
'PDECIMAL' => 'number(6, 3)',
'PDECIMAL:' => 'number(%d, 3)',
'VCHAR_UNI' => 'varchar2(765)',
'VCHAR_UNI:'=> array('varchar2(%d)', 'limit' => array('mult', 3, 765, 'clob')),
'VCHAR_CI' => 'varchar2(255)',
'VARBINARY' => 'raw(255)',
),
'sqlite' => array(
'INT:' => 'int(%d)',
'BINT' => 'bigint(20)',
'UINT' => 'INTEGER UNSIGNED', //'mediumint(8) UNSIGNED',
'UINT:' => 'INTEGER UNSIGNED', // 'int(%d) UNSIGNED',
'TINT:' => 'tinyint(%d)',
'USINT' => 'INTEGER UNSIGNED', //'mediumint(4) UNSIGNED',
'BOOL' => 'INTEGER UNSIGNED', //'tinyint(1) UNSIGNED',
'VCHAR' => 'varchar(255)',
'VCHAR:' => 'varchar(%d)',
'CHAR:' => 'char(%d)',
'XSTEXT' => 'text(65535)',
'STEXT' => 'text(65535)',
'TEXT' => 'text(65535)',
'MTEXT' => 'mediumtext(16777215)',
'XSTEXT_UNI'=> 'text(65535)',
'STEXT_UNI' => 'text(65535)',
'TEXT_UNI' => 'text(65535)',
'MTEXT_UNI' => 'mediumtext(16777215)',
'TIMESTAMP' => 'INTEGER UNSIGNED', //'int(11) UNSIGNED',
'DECIMAL' => 'decimal(5,2)',
'DECIMAL:' => 'decimal(%d,2)',
'PDECIMAL' => 'decimal(6,3)',
'PDECIMAL:' => 'decimal(%d,3)',
'VCHAR_UNI' => 'varchar(255)',
'VCHAR_UNI:'=> 'varchar(%d)',
'VCHAR_CI' => 'varchar(255)',
'VARBINARY' => 'blob',
),
'postgres' => array(
'INT:' => 'INT4',
'BINT' => 'INT8',
'UINT' => 'INT4', // unsigned
'UINT:' => 'INT4', // unsigned
'USINT' => 'INT2', // unsigned
'BOOL' => 'INT2', // unsigned
'TINT:' => 'INT2',
'VCHAR' => 'varchar(255)',
'VCHAR:' => 'varchar(%d)',
'CHAR:' => 'char(%d)',
'XSTEXT' => 'varchar(1000)',
'STEXT' => 'varchar(3000)',
'TEXT' => 'varchar(8000)',
'MTEXT' => 'TEXT',
'XSTEXT_UNI'=> 'varchar(100)',
'STEXT_UNI' => 'varchar(255)',
'TEXT_UNI' => 'varchar(4000)',
'MTEXT_UNI' => 'TEXT',
'TIMESTAMP' => 'INT4', // unsigned
'DECIMAL' => 'decimal(5,2)',
'DECIMAL:' => 'decimal(%d,2)',
'PDECIMAL' => 'decimal(6,3)',
'PDECIMAL:' => 'decimal(%d,3)',
'VCHAR_UNI' => 'varchar(255)',
'VCHAR_UNI:'=> 'varchar(%d)',
'VCHAR_CI' => 'varchar_ci',
'VARBINARY' => 'bytea',
),
);
/**
* A list of types being unsigned for better reference in some db's
* @var array
*/
var $unsigned_types = array('UINT', 'UINT:', 'USINT', 'BOOL', 'TIMESTAMP');
/**
* A list of supported DBMS. We change this class to support more DBMS, the DBMS itself only need to follow some rules.
* @var array
*/
var $supported_dbms = array('firebird', 'mssql', 'mysql_40', 'mysql_41', 'oracle', 'postgres', 'sqlite');
/**
* This is set to true if user only wants to return the 'to-be-executed' SQL statement(s) (as an array).
* This mode has no effect on some methods (inserting of data for example). This is expressed within the methods command.
*/
var $return_statements = false;
/**
* Constructor. Set DB Object and set {@link $return_statements return_statements}.
*
* @param phpbb_dbal $db DBAL object
* @param bool $return_statements True if only statements should be returned and no SQL being executed
*/
function phpbb_db_tools(&$db, $return_statements = false)
{
$this->db = $db;
$this->return_statements = $return_statements;
// Determine mapping database type
switch ($this->db->sql_layer)
{
case 'mysql':
$this->sql_layer = 'mysql_40';
break;
case 'mysql4':
if (version_compare($this->db->sql_server_info(true), '4.1.3', '>='))
{
$this->sql_layer = 'mysql_41';
}
else
{
$this->sql_layer = 'mysql_40';
}
break;
case 'mysqli':
$this->sql_layer = 'mysql_41';
break;
case 'mssql':
case 'mssql_odbc':
$this->sql_layer = 'mssql';
break;
default:
$this->sql_layer = $this->db->sql_layer;
break;
}
}
/**
* Check if table exists
*
*
* @param string $table_name The table name to check for
* @return bool true if table exists, else false
*/
function sql_table_exists($table_name)
{
$this->db->sql_return_on_error(true);
$result = $this->db->sql_query_limit('SELECT * FROM ' . $table_name, 1);
$this->db->sql_return_on_error(false);
if ($result)
{
$this->db->sql_freeresult($result);
return true;
}
return false;
}
/**
* Create SQL Table
*
* @param string $table_name The table name to create
* @param array $table_data Array containing table data.
* @return array Statements if $return_statements is true.
*/
function sql_create_table($table_name, $table_data)
{
// holds the DDL for a column
$columns = $statements = array();
// Begin transaction
$statements[] = 'begin';
// Determine if we have created a PRIMARY KEY in the earliest
$primary_key_gen = false;
// Determine if the table must be created with TEXTIMAGE
$create_textimage = false;
// Determine if the table requires a sequence
$create_sequence = false;
// Begin table sql statement
switch ($this->sql_layer)
{
case 'mssql':
$table_sql = 'CREATE TABLE [' . $table_name . '] (' . "\n";
break;
default:
$table_sql = 'CREATE TABLE ' . $table_name . ' (' . "\n";
break;
}
// Iterate through the columns to create a table
foreach ($table_data['COLUMNS'] as $column_name => $column_data)
{
// here lies an array, filled with information compiled on the column's data
$prepared_column = $this->sql_prepare_column_data($table_name, $column_name, $column_data);
// here we add the definition of the new column to the list of columns
switch ($this->sql_layer)
{
case 'mssql':
$columns[] = "\t [{$column_name}] " . $prepared_column['column_type_sql_default'];
break;
default:
$columns[] = "\t {$column_name} " . $prepared_column['column_type_sql'];
break;
}
// see if we have found a primary key set due to a column definition if we have found it, we can stop looking
if (!$primary_key_gen)
{
$primary_key_gen = isset($prepared_column['primary_key_set']) && $prepared_column['primary_key_set'];
}
// create textimage DDL based off of the existance of certain column types
if (!$create_textimage)
{
$create_textimage = isset($prepared_column['textimage']) && $prepared_column['textimage'];
}
// create sequence DDL based off of the existance of auto incrementing columns
if (!$create_sequence && isset($prepared_column['auto_increment']) && $prepared_column['auto_increment'])
{
$create_sequence = $column_name;
}
}
// this makes up all the columns in the create table statement
$table_sql .= implode(",\n", $columns);
// Close the table for two DBMS and add to the statements
switch ($this->sql_layer)
{
case 'firebird':
$table_sql .= "\n);";
$statements[] = $table_sql;
break;
case 'mssql':
$table_sql .= "\n) ON [PRIMARY]" . (($create_textimage) ? ' TEXTIMAGE_ON [PRIMARY]' : '');
$statements[] = $table_sql;
break;
}
// we have yet to create a primary key for this table,
// this means that we can add the one we really wanted instead
if (!$primary_key_gen)
{
// Write primary key
if (isset($table_data['PRIMARY_KEY']))
{
if (!is_array($table_data['PRIMARY_KEY']))
{
$table_data['PRIMARY_KEY'] = array($table_data['PRIMARY_KEY']);
}
switch ($this->sql_layer)
{
case 'mysql_40':
case 'mysql_41':
case 'postgres':
case 'sqlite':
$table_sql .= ",\n\t PRIMARY KEY (" . implode(', ', $table_data['PRIMARY_KEY']) . ')';
break;
case 'firebird':
case 'mssql':
$primary_key_stmts = $this->sql_create_primary_key($table_name, $table_data['PRIMARY_KEY']);
foreach ($primary_key_stmts as $pk_stmt)
{
$statements[] = $pk_stmt;
}
break;
case 'oracle':
$table_sql .= ",\n\t CONSTRAINT pk_{$table_name} PRIMARY KEY (" . implode(', ', $table_data['PRIMARY_KEY']) . ')';
break;
}
}
}
// close the table
switch ($this->sql_layer)
{
case 'mysql_41':
// make sure the table is in UTF-8 mode
$table_sql .= "\n) CHARACTER SET `utf8` COLLATE `utf8_bin`;";
$statements[] = $table_sql;
break;
case 'mysql_40':
case 'sqlite':
$table_sql .= "\n);";
$statements[] = $table_sql;
break;
case 'postgres':
// do we need to add a sequence for auto incrementing columns?
if ($create_sequence)
{
$statements[] = "CREATE SEQUENCE {$table_name}_seq;";
}
$table_sql .= "\n);";
$statements[] = $table_sql;
break;
case 'oracle':
$table_sql .= "\n);";
$statements[] = $table_sql;
// do we need to add a sequence and a tigger for auto incrementing columns?
if ($create_sequence)
{
// create the actual sequence
$statements[] = "CREATE SEQUENCE {$table_name}_seq";
// the trigger is the mechanism by which we increment the counter
$trigger = "CREATE OR REPLACE TRIGGER t_{$table_name}\n";
$trigger .= "BEFORE INSERT ON {$table_name}\n";
$trigger .= "FOR EACH ROW WHEN (\n";
$trigger .= "\tnew.{$create_sequence} IS NULL OR new.{$create_sequence} = 0\n";
$trigger .= ")\n";
$trigger .= "BEGIN\n";
$trigger .= "\tSELECT {$table_name}_seq.nextval\n";
$trigger .= "\tINTO :new.{$create_sequence}\n";
$trigger .= "\tFROM dual\n";
$trigger .= "END;";
$statements[] = $trigger;
}
break;
case 'firebird':
if ($create_sequence)
{
$statements[] = "CREATE SEQUENCE {$table_name}_seq;";
}
break;
}
// Write Keys
if (isset($table_data['KEYS']))
{
foreach ($table_data['KEYS'] as $key_name => $key_data)
{
if (!is_array($key_data[1]))
{
$key_data[1] = array($key_data[1]);
}
$old_return_statements = $this->return_statements;
$this->return_statements = true;
$key_stmts = ($key_data[0] == 'UNIQUE') ? $this->sql_create_unique_index($table_name, $key_name, $key_data[1]) : $this->sql_create_index($table_name, $key_name, $key_data[1]);
foreach ($key_stmts as $key_stmt)
{
$statements[] = $key_stmt;
}
$this->return_statements = $old_return_statements;
}
}
// Commit Transaction
$statements[] = 'commit';
return $this->_sql_run_sql($statements);
}
/**
* Handle passed database update array.
* Expected structure...
* Key being one of the following
* change_columns: Column changes (only type, not name)
* add_columns: Add columns to a table
* drop_keys: Dropping keys
* drop_columns: Removing/Dropping columns
* add_primary_keys: adding primary keys
* add_unique_index: adding an unique index
* add_index: adding an index
*
* The values are in this format:
* {TABLE NAME} => array(
* {COLUMN NAME} => array({COLUMN TYPE}, {DEFAULT VALUE}, {OPTIONAL VARIABLES}),
* {KEY/INDEX NAME} => array({COLUMN NAMES}),
* )
*
* For more information have a look at /develop/create_schema_files.php (only available through SVN)
*/
function perform_schema_changes($schema_changes)
{
if (empty($schema_changes))
{
return;
}
$statements = array();
// Change columns?
if (!empty($schema_changes['change_columns']))
{
foreach ($schema_changes['change_columns'] as $table => $columns)
{
foreach ($columns as $column_name => $column_data)
{
// If the column exists we change it, else we add it ;)
if ($this->sql_column_exists($table, $column_name))
{
$result = $this->sql_column_change($table, $column_name, $column_data);
}
else
{
$result = $this->sql_column_add($table, $column_name, $column_data);
}
if ($this->return_statements)
{
$statements = array_merge($statements, $result);
}
}
}
}
// Add columns?
if (!empty($schema_changes['add_columns']))
{
foreach ($schema_changes['add_columns'] as $table => $columns)
{
foreach ($columns as $column_name => $column_data)
{
// Only add the column if it does not exist yet, else change it (to be consistent)
if ($this->sql_column_exists($table, $column_name))
{
$result = $this->sql_column_change($table, $column_name, $column_data);
}
else
{
$result = $this->sql_column_add($table, $column_name, $column_data);
}
if ($this->return_statements)
{
$statements = array_merge($statements, $result);
}
}
}
}
// Remove keys?
if (!empty($schema_changes['drop_keys']))
{
foreach ($schema_changes['drop_keys'] as $table => $indexes)
{
foreach ($indexes as $index_name)
{
$result = $this->sql_index_drop($table, $index_name);
if ($this->return_statements)
{
$statements = array_merge($statements, $result);
}
}
}
}
// Drop columns?
if (!empty($schema_changes['drop_columns']))
{
foreach ($schema_changes['drop_columns'] as $table => $columns)
{
foreach ($columns as $column)
{
// Only remove the column if it exists...
if ($this->sql_column_exists($table, $column))
{
$result = $this->sql_column_remove($table, $column);
if ($this->return_statements)
{
$statements = array_merge($statements, $result);
}
}
}
}
}
// Add primary keys?
if (!empty($schema_changes['add_primary_keys']))
{
foreach ($schema_changes['add_primary_keys'] as $table => $columns)
{
$result = $this->sql_create_primary_key($table, $columns);
if ($this->return_statements)
{
$statements = array_merge($statements, $result);
}
}
}
// Add unqiue indexes?
if (!empty($schema_changes['add_unique_index']))
{
foreach ($schema_changes['add_unique_index'] as $table => $index_array)
{
foreach ($index_array as $index_name => $column)
{
$result = $this->sql_create_unique_index($table, $index_name, $column);
if ($this->return_statements)
{
$statements = array_merge($statements, $result);
}
}
}
}
// Add indexes?
if (!empty($schema_changes['add_index']))
{
foreach ($schema_changes['add_index'] as $table => $index_array)
{
foreach ($index_array as $index_name => $column)
{
$result = $this->sql_create_index($table, $index_name, $column);
if ($this->return_statements)
{
$statements = array_merge($statements, $result);
}
}
}
}
if ($this->return_statements)
{
return $statements;
}
}
/**
* Check if a specified column exist
*
* @param string $table Table to check the column at
* @param string $column_name The column to check
*
* @return bool True if column exists, else false
*/
function sql_column_exists($table, $column_name)
{
switch ($this->sql_layer)
{
case 'mysql_40':
case 'mysql_41':
$sql = "SHOW COLUMNS FROM $table";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
// lower case just in case
if (strtolower($row['Field']) == $column_name)
{
$this->db->sql_freeresult($result);
return true;
}
}
$this->db->sql_freeresult($result);
return false;
break;
// PostgreSQL has a way of doing this in a much simpler way but would
// not allow us to support all versions of PostgreSQL
case 'postgres':
$sql = "SELECT a.attname
FROM pg_class c, pg_attribute a
WHERE c.relname = '{$table}'
AND a.attnum > 0
AND a.attrelid = c.oid";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
// lower case just in case
if (strtolower($row['attname']) == $column_name)
{
$this->db->sql_freeresult($result);
return true;
}
}
$this->db->sql_freeresult($result);
return false;
break;
// same deal with PostgreSQL, we must perform more complex operations than
// we technically could
case 'mssql':
$sql = "SELECT c.name
FROM syscolumns c
LEFT JOIN sysobjects o ON c.id = o.id
WHERE o.name = '{$table}'";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
// lower case just in case
if (strtolower($row['name']) == $column_name)
{
$this->db->sql_freeresult($result);
return true;
}
}
$this->db->sql_freeresult($result);
return false;
break;
case 'oracle':
$sql = "SELECT column_name
FROM user_tab_columns
WHERE table_name = '{$table}'";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
// lower case just in case
if (strtolower($row['column_name']) == $column_name)
{
$this->db->sql_freeresult($result);
return true;
}
}
$this->db->sql_freeresult($result);
return false;
break;
case 'firebird':
$sql = "SELECT RDB\$FIELD_NAME as FNAME
FROM RDB\$RELATION_FIELDS
WHERE RDB\$RELATION_NAME = '{$table}'";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
// lower case just in case
if (strtolower($row['fname']) == $column_name)
{
$this->db->sql_freeresult($result);
return true;
}
}
$this->db->sql_freeresult($result);
return false;
break;
// ugh, SQLite
case 'sqlite':
$sql = "SELECT sql
FROM sqlite_master
WHERE type = 'table'
AND name = '{$table}'";
$result = $this->db->sql_query($sql);
if (!$result)
{
return false;
}
$row = $this->db->sql_fetchrow($result);
$this->db->sql_freeresult($result);
preg_match('#\((.*)\)#s', $row['sql'], $matches);
$cols = trim($matches[1]);
$col_array = preg_split('/,(?![\s\w]+\))/m', $cols);
foreach ($col_array as $declaration)
{
$entities = preg_split('#\s+#', trim($declaration));
if ($entities[0] == 'PRIMARY')
{
continue;
}
if (strtolower($entities[0]) == $column_name)
{
return true;
}
}
return false;
break;
}
}
/**
* Private method for performing sql statements (either execute them or return them)
* @access private
*/
function _sql_run_sql($statements)
{
if ($this->return_statements)
{
return $statements;
}
// We could add error handling here...
foreach ($statements as $sql)
{
if ($sql === 'begin')
{
$this->db->sql_transaction('begin');
}
else if ($sql === 'commit')
{
$this->db->sql_transaction('commit');
}
else
{
$this->db->sql_query($sql);
}
}
return true;
}
/**
* Function to prepare some column information for better usage
* @access private
*/
function sql_prepare_column_data($table_name, $column_name, $column_data)
{
// Get type
if (strpos($column_data[0], ':') !== false)
{
list($orig_column_type, $column_length) = explode(':', $column_data[0]);
if (!is_array($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']))
{
$column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'], $column_length);
}
else
{
if (isset($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule']))
{
switch ($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule'][0])
{
case 'div':
$column_length /= $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule'][1];
$column_length = ceil($column_length);
$column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'][0], $column_length);
break;
}
}
if (isset($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit']))
{
switch ($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][0])
{
case 'mult':
$column_length *= $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][1];
if ($column_length > $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][2])
{
$column_type = $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][3];
}
else
{
$column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'][0], $column_length);
}
break;
}
}
}
$orig_column_type .= ':';
}
else
{
$orig_column_type = $column_data[0];
$column_type = $this->dbms_type_map[$this->sql_layer][$column_data[0]];
}
// Adjust default value if db-dependant specified
if (is_array($column_data[1]))
{
$column_data[1] = (isset($column_data[1][$this->sql_layer])) ? $column_data[1][$this->sql_layer] : $column_data[1]['default'];
}
$sql = '';
$return_array = array();
switch ($this->sql_layer)
{
case 'firebird':
$sql .= " {$column_type} ";
if (!is_null($column_data[1]))
{
$sql .= 'DEFAULT ' . ((is_numeric($column_data[1])) ? $column_data[1] : "'{$column_data[1]}'") . ' ';
}
$sql .= 'NOT NULL';
// This is a UNICODE column and thus should be given it's fair share
if (preg_match('/^X?STEXT_UNI|VCHAR_(CI|UNI:?)/', $column_data[0]))
{
$sql .= ' COLLATE UNICODE';
}
$return_array['auto_increment'] = false;
if (isset($column_data[2]) && $column_data[2] == 'auto_increment')
{
$return_array['auto_increment'] = true;
}
break;
case 'mssql':
$sql .= " {$column_type} ";
$sql_default = " {$column_type} ";
// For adding columns we need the default definition
if (!is_null($column_data[1]))
{
// For hexadecimal values do not use single quotes
if (strpos($column_data[1], '0x') === 0)
{
$sql_default .= 'DEFAULT (' . $column_data[1] . ') ';
}
else
{
$sql_default .= 'DEFAULT (' . ((is_numeric($column_data[1])) ? $column_data[1] : "'{$column_data[1]}'") . ') ';
}
}
if (isset($column_data[2]) && $column_data[2] == 'auto_increment')
{
// $sql .= 'IDENTITY (1, 1) ';
$sql_default .= 'IDENTITY (1, 1) ';
}
$return_array['textimage'] = $column_type === '[text]';
$sql .= 'NOT NULL';
$sql_default .= 'NOT NULL';
$return_array['column_type_sql_default'] = $sql_default;
break;
case 'mysql_40':
case 'mysql_41':
$sql .= " {$column_type} ";
// For hexadecimal values do not use single quotes
if (!is_null($column_data[1]) && substr($column_type, -4) !== 'text' && substr($column_type, -4) !== 'blob')
{
$sql .= (strpos($column_data[1], '0x') === 0) ? "DEFAULT {$column_data[1]} " : "DEFAULT '{$column_data[1]}' ";
}
$sql .= 'NOT NULL';
if (isset($column_data[2]))
{
if ($column_data[2] == 'auto_increment')
{
$sql .= ' auto_increment';
}
else if ($this->sql_layer === 'mysql_41' && $column_data[2] == 'true_sort')
{
$sql .= ' COLLATE utf8_unicode_ci';
}
}
break;
case 'oracle':
$sql .= " {$column_type} ";
$sql .= (!is_null($column_data[1])) ? "DEFAULT '{$column_data[1]}' " : '';
// In Oracle empty strings ('') are treated as NULL.
// Therefore in oracle we allow NULL's for all DEFAULT '' entries
// Oracle does not like setting NOT NULL on a column that is already NOT NULL (this happens only on number fields)
if (!preg_match('/number/i', $column_type))
{
$sql .= ($column_data[1] === '') ? '' : 'NOT NULL';
}
$return_array['auto_increment'] = false;
if (isset($column_data[2]) && $column_data[2] == 'auto_increment')
{
$return_array['auto_increment'] = true;
}
break;
case 'postgres':
$return_array['column_type'] = $column_type;
$sql .= " {$column_type} ";
$return_array['auto_increment'] = false;
if (isset($column_data[2]) && $column_data[2] == 'auto_increment')
{
$default_val = "nextval('{$table_name}_seq')";
$return_array['auto_increment'] = true;
}
else if (!is_null($column_data[1]))
{
$default_val = "'" . $column_data[1] . "'";
$return_array['null'] = 'NOT NULL';
$sql .= 'NOT NULL ';
}
$return_array['default'] = $default_val;
$sql .= "DEFAULT {$default_val}";
// Unsigned? Then add a CHECK contraint
if (in_array($orig_column_type, $this->unsigned_types))
{
$return_array['constraint'] = "CHECK ({$column_name} >= 0)";
$sql .= " CHECK ({$column_name} >= 0)";
}
break;
case 'sqlite':
$return_array['primary_key_set'] = false;
if (isset($column_data[2]) && $column_data[2] == 'auto_increment')
{
$sql .= ' INTEGER PRIMARY KEY';
$return_array['primary_key_set'] = true;
}
else
{
$sql .= ' ' . $column_type;
}
$sql .= ' NOT NULL ';
$sql .= (!is_null($column_data[1])) ? "DEFAULT '{$column_data[1]}'" : '';
break;
}
$return_array['column_type_sql'] = $sql;
return $return_array;
}
/**
* Add new column
*/
function sql_column_add($table_name, $column_name, $column_data)
{
$column_data = $this->sql_prepare_column_data($table_name, $column_name, $column_data);
$statements = array();
switch ($this->sql_layer)
{
case 'firebird':
$statements[] = 'ALTER TABLE ' . $table_name . ' ADD "' . strtoupper($column_name) . '" ' . $column_data['column_type_sql'];
break;
case 'mssql':
$statements[] = 'ALTER TABLE [' . $table_name . '] ADD [' . $column_name . '] ' . $column_data['column_type_sql_default'];
break;
case 'mysql_40':
case 'mysql_41':
$statements[] = 'ALTER TABLE `' . $table_name . '` ADD COLUMN `' . $column_name . '` ' . $column_data['column_type_sql'];
break;
case 'oracle':
$statements[] = 'ALTER TABLE ' . $table_name . ' ADD ' . $column_name . ' ' . $column_data['column_type_sql'];
break;
case 'postgres':
$statements[] = 'ALTER TABLE ' . $table_name . ' ADD COLUMN "' . $column_name . '" ' . $column_data['column_type_sql'];
break;
case 'sqlite':
if (version_compare(sqlite_libversion(), '3.0') == -1)
{
$sql = "SELECT sql
FROM sqlite_master
WHERE type = 'table'
AND name = '{$table_name}'
ORDER BY type DESC, name;";
$result = $this->db->sql_query($sql);
if (!$result)
{
break;
}
$row = $this->db->sql_fetchrow($result);
$this->db->sql_freeresult($result);
$statements[] = 'begin';
// Create a backup table and populate it, destroy the existing one
$statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $row['sql']);
$statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;
$statements[] = 'DROP TABLE ' . $table_name;
preg_match('#\((.*)\)#s', $row['sql'], $matches);
$new_table_cols = trim($matches[1]);
$old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);
$column_list = array();
foreach ($old_table_cols as $declaration)
{
$entities = preg_split('#\s+#', trim($declaration));
if ($entities[0] == 'PRIMARY')
{
continue;
}
$column_list[] = $entities[0];
}
$columns = implode(',', $column_list);
$new_table_cols = $column_name . ' ' . $column_data['column_type_sql'] . ',' . $new_table_cols;
// create a new table and fill it up. destroy the temp one
$statements[] = 'CREATE TABLE ' . $table_name . ' (' . $new_table_cols . ');';
$statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';
$statements[] = 'DROP TABLE ' . $table_name . '_temp';
$statements[] = 'commit';
}
else
{
$statements[] = 'ALTER TABLE ' . $table_name . ' ADD ' . $column_name . ' [' . $column_data['column_type_sql'] . ']';
}
break;
}
return $this->_sql_run_sql($statements);
}
/**
* Drop column
*/
function sql_column_remove($table_name, $column_name)
{
$statements = array();
switch ($this->sql_layer)
{
case 'firebird':
$statements[] = 'ALTER TABLE ' . $table_name . ' DROP "' . strtoupper($column_name) . '"';
break;
case 'mssql':
$statements[] = 'ALTER TABLE [' . $table_name . '] DROP COLUMN [' . $column_name . ']';
break;
case 'mysql_40':
case 'mysql_41':
$statements[] = 'ALTER TABLE `' . $table_name . '` DROP COLUMN `' . $column_name . '`';
break;
case 'oracle':
$statements[] = 'ALTER TABLE ' . $table_name . ' DROP ' . $column_name;
break;
case 'postgres':
$statements[] = 'ALTER TABLE ' . $table_name . ' DROP COLUMN "' . $column_name . '"';
break;
case 'sqlite':
if (version_compare(sqlite_libversion(), '3.0') == -1)
{
$sql = "SELECT sql
FROM sqlite_master
WHERE type = 'table'
AND name = '{$table_name}'
ORDER BY type DESC, name;";
$result = $this->db->sql_query($sql);
if (!$result)
{
break;
}
$row = $this->db->sql_fetchrow($result);
$this->db->sql_freeresult($result);
$statements[] = 'begin';
// Create a backup table and populate it, destroy the existing one
$statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $row['sql']);
$statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;
$statements[] = 'DROP TABLE ' . $table_name;
preg_match('#\((.*)\)#s', $row['sql'], $matches);
$new_table_cols = trim($matches[1]);
$old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);
$column_list = array();
foreach ($old_table_cols as $declaration)
{
$entities = preg_split('#\s+#', trim($declaration));
if ($entities[0] == 'PRIMARY' || $entities[0] === $column_name)
{
continue;
}
$column_list[] = $entities[0];
}
$columns = implode(',', $column_list);
$new_table_cols = $new_table_cols = preg_replace('/' . $column_name . '[^,]+(?:,|$)/m', '', $new_table_cols);
// create a new table and fill it up. destroy the temp one
$statements[] = 'CREATE TABLE ' . $table_name . ' (' . $new_table_cols . ');';
$statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';
$statements[] = 'DROP TABLE ' . $table_name . '_temp';
$statements[] = 'commit';
}
else
{
$statements[] = 'ALTER TABLE ' . $table_name . ' DROP COLUMN ' . $column_name;
}
break;
}
return $this->_sql_run_sql($statements);
}
/**
* Drop Index
*/
function sql_index_drop($table_name, $index_name)
{
$statements = array();
switch ($this->sql_layer)
{
case 'mssql':
$statements[] = 'DROP INDEX ' . $table_name . '.' . $index_name;
break;
case 'mysql_40':
case 'mysql_41':
$statements[] = 'DROP INDEX ' . $index_name . ' ON ' . $table_name;
break;
case 'firebird':
case 'oracle':
case 'postgres':
case 'sqlite':
$statements[] = 'DROP INDEX ' . $table_name . '_' . $index_name;
break;
}
return $this->_sql_run_sql($statements);
}
/**
* Drop Table
*/
function sql_table_drop($table_name)
{
$statements = array();
// the most basic operation, get rid of the table
$statements[] = 'DROP TABLE ' . $table_name;
switch ($this->sql_layer)
{
case 'firebird':
$sql = 'SELECT RDB$GENERATOR_NAME as gen
FROM RDB$GENERATORS
WHERE RDB$SYSTEM_FLAG = 0
AND RDB$GENERATOR_NAME = \'' . strtoupper($table_name) . "_GEN'";
$result = $this->db->sql_query($sql);
// does a generator exist?
if ($row = $this->db->sql_fetchrow($result))
{
$statements[] = "DROP GENERATOR {$row['gen']};";
}
$this->db->sql_freeresult($result);
break;
case 'oracle':
$sql = 'SELECT A.REFERENCED_NAME
FROM USER_DEPENDENCIES A, USER_TRIGGERS B
WHERE A.REFERENCED_TYPE = \'SEQUENCE\'
AND A.NAME = B.TRIGGER_NAME
AND B.TABLE_NAME = \'' . strtoupper($table_name) . "'";
$result = $this->db->sql_query($sql);
// any sequences ref'd to this table's triggers?
while ($row = $this->db->sql_fetchrow($result))
{
$statements[] = "DROP SEQUENCE {$row['referenced_name']}";
}
$this->db->sql_freeresult($result);
case 'postgres':
// PGSQL does not "tightly" bind sequences and tables, we must guess...
$sql = "SELECT relname
FROM pg_class
WHERE relkind = 'S'
AND relname = '{$table_name}_seq'";
$result = $this->db->sql_query($sql);
// We don't even care about storing the results. We already know the answer if we get rows back.
if ($this->db->sql_fetchrow($result))
{
$statements[] = "DROP SEQUENCE {$table_name}_seq;\n";
}
$this->db->sql_freeresult($result);
break;
}
return $this->_sql_run_sql($statements);
}
/**
* Add primary key
*/
function sql_create_primary_key($table_name, $column)
{
$statements = array();
switch ($this->sql_layer)
{
case 'firebird':
case 'postgres':
case 'mysql_40':
case 'mysql_41':
$statements[] = 'ALTER TABLE ' . $table_name . ' ADD PRIMARY KEY (' . implode(', ', $column) . ')';
break;
case 'mssql':
$sql = "ALTER TABLE [{$table_name}] WITH NOCHECK ADD ";
$sql .= "CONSTRAINT [PK_{$table_name}] PRIMARY KEY CLUSTERED (";
$sql .= '[' . implode("],\n\t\t[", $column) . ']';
$sql .= ') ON [PRIMARY]';
$statements[] = $sql;
break;
case 'oracle':
$statements[] = 'ALTER TABLE ' . $table_name . 'add CONSTRAINT pk_' . $table_name . ' PRIMARY KEY (' . implode(', ', $column) . ')';
break;
case 'sqlite':
$sql = "SELECT sql
FROM sqlite_master
WHERE type = 'table'
AND name = '{$table_name}'
ORDER BY type DESC, name;";
$result = $this->db->sql_query($sql);
if (!$result)
{
break;
}
$row = $this->db->sql_fetchrow($result);
$this->db->sql_freeresult($result);
$statements[] = 'begin';
// Create a backup table and populate it, destroy the existing one
$statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $row['sql']);
$statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;
$statements[] = 'DROP TABLE ' . $table_name;
preg_match('#\((.*)\)#s', $row['sql'], $matches);
$new_table_cols = trim($matches[1]);
$old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);
$column_list = array();
foreach ($old_table_cols as $declaration)
{
$entities = preg_split('#\s+#', trim($declaration));
if ($entities[0] == 'PRIMARY')
{
continue;
}
$column_list[] = $entities[0];
}
$columns = implode(',', $column_list);
// create a new table and fill it up. destroy the temp one
$statements[] = 'CREATE TABLE ' . $table_name . ' (' . $new_table_cols . ', PRIMARY KEY (' . implode(', ', $column) . '));';
$statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';
$statements[] = 'DROP TABLE ' . $table_name . '_temp';
$statements[] = 'commit';
break;
}
return $this->_sql_run_sql($statements);
}
/**
* Add unique index
*/
function sql_create_unique_index($table_name, $index_name, $column)
{
$statements = array();
switch ($this->sql_layer)
{
case 'firebird':
case 'postgres':
case 'oracle':
case 'sqlite':
$statements[] = 'CREATE UNIQUE INDEX ' . $table_name . '_' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ')';
break;
case 'mysql_40':
case 'mysql_41':
$statements[] = 'CREATE UNIQUE INDEX ' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ')';
break;
case 'mssql':
$statements[] = 'CREATE UNIQUE INDEX ' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ') ON [PRIMARY]';
break;
}
return $this->_sql_run_sql($statements);
}
/**
* Add index
*/
function sql_create_index($table_name, $index_name, $column)
{
$statements = array();
switch ($this->sql_layer)
{
case 'firebird':
case 'postgres':
case 'oracle':
case 'sqlite':
$statements[] = 'CREATE INDEX ' . $table_name . '_' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ')';
break;
case 'mysql_40':
case 'mysql_41':
$statements[] = 'CREATE INDEX ' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ')';
break;
case 'mssql':
$statements[] = 'CREATE INDEX ' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ') ON [PRIMARY]';
break;
}
return $this->_sql_run_sql($statements);
}
/**
* List all of the indices that belong to a table,
* does not count:
* * UNIQUE indices
* * PRIMARY keys
*/
function sql_list_index($table_name)
{
$index_array = array();
if ($this->sql_layer == 'mssql')
{
$sql = "EXEC sp_statistics '$table_name'";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
if ($row['TYPE'] == 3)
{
$index_array[] = $row['INDEX_NAME'];
}
}
$this->db->sql_freeresult($result);
}
else
{
switch ($this->sql_layer)
{
case 'firebird':
$sql = "SELECT LOWER(RDB\$INDEX_NAME) as index_name
FROM RDB\$INDICES
WHERE RDB\$RELATION_NAME = " . strtoupper($table_name) . "
AND RDB\$UNIQUE_FLAG IS NULL
AND RDB\$FOREIGN_KEY IS NULL";
$col = 'index_name';
break;
case 'postgres':
$sql = "SELECT ic.relname as index_name
FROM pg_class bc, pg_class ic, pg_index i
WHERE (bc.oid = i.indrelid)
AND (ic.oid = i.indexrelid)
AND (bc.relname = '" . $table_name . "')
AND (i.indisunique != 't')
AND (i.indisprimary != 't')";
$col = 'index_name';
break;
case 'mysql_40':
case 'mysql_41':
$sql = 'SHOW KEYS
FROM ' . $table_name;
$col = 'Key_name';
break;
case 'oracle':
$sql = "SELECT index_name
FROM user_indexes
WHERE table_name = '" . $table_name . "'
AND generated = 'N'";
$col = 'index_name';
break;
case 'sqlite':
$sql = "PRAGMA index_info('" . $table_name . "');";
$col = 'name';
break;
}
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
if (($this->sql_layer == 'mysql_40' || $this->sql_layer == 'mysql_41') && !$row['Non_unique'])
{
continue;
}
switch ($this->sql_layer)
{
case 'firebird':
case 'oracle':
case 'postgres':
case 'sqlite':
$row[$col] = substr($row[$col], strlen($table_name) + 1);
break;
}
$index_array[] = $row[$col];
}
$this->db->sql_freeresult($result);
}
return array_map('strtolower', $index_array);
}
/**
* Change column type (not name!)
*/
function sql_column_change($table_name, $column_name, $column_data)
{
$column_data = $this->sql_prepare_column_data($table_name, $column_name, $column_data);
$statements = array();
switch ($this->sql_layer)
{
case 'firebird':
// Change type...
$statements[] = 'ALTER TABLE ' . $table_name . ' ALTER COLUMN "' . strtoupper($column_name) . '" TYPE ' . ' ' . $column_data['column_type_sql'];
break;
case 'mssql':
$statements[] = 'ALTER TABLE [' . $table_name . '] ALTER COLUMN [' . $column_name . '] ' . $column_data['column_type_sql'];
break;
case 'mysql_40':
case 'mysql_41':
$statements[] = 'ALTER TABLE `' . $table_name . '` CHANGE `' . $column_name . '` `' . $column_name . '` ' . $column_data['column_type_sql'];
break;
case 'oracle':
$statements[] = 'ALTER TABLE ' . $table_name . ' MODIFY ' . $column_name . ' ' . $column_data['column_type_sql'];
break;
case 'postgres':
$sql = 'ALTER TABLE ' . $table_name . ' ';
$sql_array = array();
$sql_array[] = 'ALTER COLUMN ' . $column_name . ' TYPE ' . $column_data['column_type'];
if (isset($column_data['null']))
{
if ($column_data['null'] == 'NOT NULL')
{
$sql_array[] = 'ALTER COLUMN ' . $column_name . ' SET NOT NULL';
}
else if ($column_data['null'] == 'NULL')
{
$sql_array[] = 'ALTER COLUMN ' . $column_name . ' DROP NOT NULL';
}
}
if (isset($column_data['default']))
{
$sql_array[] = 'ALTER COLUMN ' . $column_name . ' SET DEFAULT ' . $column_data['default'];
}
// we don't want to double up on constraints if we change different number data types
if (isset($column_data['constraint']))
{
$constraint_sql = "SELECT consrc as constraint_data
FROM pg_constraint, pg_class bc
WHERE conrelid = bc.oid
AND bc.relname = '{$table_name}'
AND NOT EXISTS (
SELECT *
FROM pg_constraint as c, pg_inherits as i
WHERE i.inhrelid = pg_constraint.conrelid
AND c.conname = pg_constraint.conname
AND c.consrc = pg_constraint.consrc
AND c.conrelid = i.inhparent
)";
$constraint_exists = false;
$result = $this->db->sql_query($constraint_sql);
while ($row = $this->db->sql_fetchrow($result))
{
if (trim($row['constraint_data']) == trim($column_data['constraint']))
{
$constraint_exists = true;
break;
}
}
$this->db->sql_freeresult($result);
if (!$constraint_exists)
{
$sql_array[] = 'ADD ' . $column_data['constraint'];
}
}
$sql .= implode(', ', $sql_array);
$statements[] = $sql;
break;
case 'sqlite':
$sql = "SELECT sql
FROM sqlite_master
WHERE type = 'table'
AND name = '{$table_name}'
ORDER BY type DESC, name;";
$result = $this->db->sql_query($sql);
if (!$result)
{
break;
}
$row = $this->db->sql_fetchrow($result);
$this->db->sql_freeresult($result);
$statements[] = 'begin';
// Create a temp table and populate it, destroy the existing one
$statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $row['sql']);
$statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;
$statements[] = 'DROP TABLE ' . $table_name;
preg_match('#\((.*)\)#s', $row['sql'], $matches);
$new_table_cols = trim($matches[1]);
$old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);
$column_list = array();
foreach ($old_table_cols as $key => $declaration)
{
$entities = preg_split('#\s+#', trim($declaration));
$column_list[] = $entities[0];
if ($entities[0] == $column_name)
{
$old_table_cols[$key] = $column_name . ' ' . $column_data['column_type_sql'];
}
}
$columns = implode(',', $column_list);
// create a new table and fill it up. destroy the temp one
$statements[] = 'CREATE TABLE ' . $table_name . ' (' . implode(',', $old_table_cols) . ');';
$statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';
$statements[] = 'DROP TABLE ' . $table_name . '_temp';
$statements[] = 'commit';
break;
}
return $this->_sql_run_sql($statements);
}
}
?>
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