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db_sqlite.php
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<?php
// CubicleSoft SQLite database interface.
// (C) 2016 CubicleSoft. All Rights Reserved.
if (!class_exists("CSDB", false)) require_once str_replace("\\", "/", dirname(__FILE__)) . "/db.php";
class CSDB_sqlite extends CSDB
{
protected $dbprefix;
public function IsAvailable()
{
return (class_exists("PDO") && in_array("sqlite", PDO::getAvailableDrivers()) ? "sqlite" : false);
}
public function GetDisplayName()
{
return CSDB::DB_Translate("SQLite (via PDO)");
}
public function Connect($dsn, $username = false, $password = false, $options = array())
{
$this->dbprefix = "";
parent::Connect($dsn, $username, $password, $options);
}
public function GetVersion()
{
return $this->GetOne("SELECT", array("SQLITE_VERSION()"));
}
public function GetInsertID($name = null)
{
return $this->GetOne("SELECT", array("LAST_INSERT_ROWID()"));
}
public function TableExists($name)
{
return ($this->GetOne("SHOW TABLES", array("LIKE" => (strpos($name, "__") === false ? $this->dbprefix : "") . $name)) === false ? false : true);
}
public function QuoteIdentifier($str)
{
return "\"" . str_replace(array("\"", "?"), array("\"\"", ""), $str) . "\"";
}
protected function GenerateSQL(&$master, &$sql, &$opts, $cmd, $queryinfo, $args, $subquery)
{
switch ($cmd)
{
case "SELECT":
{
$supported = array(
"DBPREFIX" => $this->dbprefix,
"PRECOLUMN" => array("DISTINCT" => "bool", "SUBQUERIES" => true),
"FROM" => array("SUBQUERIES" => true),
"WHERE" => array("SUBQUERIES" => true),
"GROUP BY" => true,
"HAVING" => true,
"ORDER BY" => true,
"LIMIT" => ", "
);
return $this->ProcessSELECT($master, $sql, $opts, $queryinfo, $args, $subquery, $supported);
}
case "INSERT":
{
$supported = array(
"DBPREFIX" => $this->dbprefix,
"PREINTO" => array("LOW_PRIORITY" => "bool", "DELAYED" => "bool", "HIGH_PRIORITY" => "bool", "IGNORE" => "bool"),
"SELECT" => true,
"BULKINSERT" => true,
"BULKINSERTLIMIT" => 900,
);
return $this->ProcessINSERT($master, $sql, $opts, $queryinfo, $args, $subquery, $supported);
}
case "UPDATE":
{
$supported = array(
"DBPREFIX" => $this->dbprefix,
"PRETABLE" => array("LOW_PRIORITY" => "bool", "IGNORE" => "bool"),
"WHERE" => array("SUBQUERIES" => true),
"ORDER BY" => true,
"LIMIT" => ", "
);
return $this->ProcessUPDATE($master, $sql, $opts, $queryinfo, $args, $subquery, $supported);
}
case "DELETE":
{
$supported = array(
"DBPREFIX" => $this->dbprefix,
"PREFROM" => array("LOW_PRIORITY" => "bool", "QUICK" => "bool", "IGNORE" => "bool"),
"WHERE" => array("SUBQUERIES" => true),
"ORDER BY" => true,
"LIMIT" => ", "
);
return $this->ProcessDELETE($master, $sql, $opts, $queryinfo, $args, $subquery, $supported);
}
case "SET":
case "CREATE DATABASE":
{
return array("success" => false, "errorcode" => "skip_sql_query");
}
case "USE":
{
$this->dbprefix = $this->GetDBPrefix($queryinfo);
return array("success" => false, "errorcode" => "skip_sql_query");
}
case "DROP DATABASE":
{
$master = true;
$result = $this->Query("SHOW TABLES", array("FROM" => $queryinfo));
while ($row = $result->NextRow())
{
$this->Query("DROP TABLE", array($row->name, "FROM" => $queryinfo));
}
return array("success" => false, "errorcode" => "skip_sql_query");
}
case "CREATE TABLE":
{
$supported = array(
"DBPREFIX" => $this->dbprefix,
"TEMPORARY" => "CREATE TEMPORARY TABLE",
"AS_SELECT" => true,
"PROCESSKEYS" => true,
"POSTCREATE" => array()
);
$result = $this->ProcessCREATE_TABLE($master, $sql, $opts, $queryinfo, $args, $subquery, $supported);
if (!$result["success"]) return $result;
// Handle named keys.
$sql = array($sql);
$opts = array($opts);
if (isset($queryinfo[2]) && is_array($queryinfo[2]))
{
foreach ($queryinfo[2] as $info)
{
if (strtoupper($info[0]) == "KEY" && isset($info["NAME"]))
{
$sql2 = "";
$opts2 = array();
$result = $this->GenerateSQL($master, $sql2, $opts2, "ADD INDEX", array($queryinfo[0], $info), array(), false);
if (!$result["success"]) return $result;
$sql[] = $sql2;
$opts[] = $opts2;
}
}
}
return $result;
}
case "ADD COLUMN":
{
$master = true;
$result = $this->ProcessColumnDefinition($queryinfo[2]);
if (!$result["success"]) return $result;
$sql = "ALTER TABLE " . $this->QuoteIdentifier($queryinfo[0]) . " ADD COLUMN " . $this->QuoteIdentifier($queryinfo[1]) . " " . $result["sql"];
return array("success" => true);
}
case "PRAGMA":
{
// PRAGMA support exists solely for SQLite DROP COLUMN.
$master = true;
$sql = "PRAGMA " . $queryinfo;
return array("success" => true);
}
case "DROP COLUMN":
{
// Has to be emulated by creating a temporary table without the column.
// Triggers, views, and foreign keys will probably be lost. If you care, then submit a patch.
$master = true;
$row = $this->GetRow("SHOW CREATE TABLE", array($queryinfo[0]));
if (!$row) return array("success" => false, "error" => CSDB::DB_Translate("An error occurred while getting existing table information."), "errorcode" => "show_create_table_error");
if (!isset($row->opts[1][$queryinfo[1]])) return array("success" => false, "errorcode" => "skip_sql_query");
unset($row->opts[1][$queryinfo[1]]);
if (!count($row->opts[1])) return array("success" => false, "error" => CSDB::DB_Translate("Table contains only one column."), "errorcode" => "drop_column_error");
$opts2 = $row->opts;
$opts2[0] = "csdb__dropcol";
$opts2["TEMPORARY"] = true;
$cols = array_keys($opts2[1]);
$this->Query("CREATE TABLE", $opts2);
$this->Query("INSERT", array("csdb__dropcol", $cols, "SELECT" => array(array($cols, "?"), $queryinfo[0])));
$this->Query("DROP TABLE", array($queryinfo[0]));
$this->Query("CREATE TABLE", $row->opts);
$this->Query("INSERT", array($queryinfo[0], $cols, "SELECT" => array(array($cols, "?"), "csdb__dropcol")));
$this->Query("DROP TABLE", array("csdb__dropcol"));
return array("success" => false, "errorcode" => "skip_sql_query");
}
case "ADD INDEX":
{
$master = true;
$keyinfo = $queryinfo[1];
$type = strtoupper($keyinfo[0]);
foreach ($keyinfo[1] as $num => $field) $keyinfo[1][$num] = $this->QuoteIdentifier($field);
if (!isset($keyinfo["NAME"])) return array("success" => false, "errorcode" => "skip_sql_query");
if ($type == "PRIMARY" || $type == "UNIQUE") $sql = "CREATE UNIQUE INDEX ";
else if ($type == "FOREIGN") return array("success" => false, "errorcode" => "skip_sql_query");
else $sql = "CREATE INDEX ";
$sql .= $this->QuoteIdentifier($this->dbprefix . $queryinfo[0] . "__" . $keyinfo["NAME"]) . " ON " . $this->QuoteIdentifier($this->dbprefix . $queryinfo[0]) . " (" . implode(", ", $keyinfo[1]) . ")";
return array("success" => true);
}
case "DROP INDEX":
{
$master = true;
if (!isset($queryinfo[2])) return array("success" => false, "errorcode" => "skip_sql_query");
$sql = "DROP INDEX " . $this->QuoteIdentifier($this->dbprefix . $queryinfo[2]);
return array("success" => true);
}
case "TRUNCATE TABLE":
{
$supported = array(
"DBPREFIX" => $this->dbprefix,
"PREFROM" => array()
);
$queryinfo = array($queryinfo[0]);
return $this->ProcessDELETE($master, $sql, $opts, $queryinfo, $args, $subquery, $supported);
}
case "DROP TABLE":
{
$master = true;
$dbprefix = (isset($queryinfo["FROM"]) ? $this->GetDBPrefix($queryinfo["FROM"]) : $this->dbprefix);
$sql = "DROP TABLE " . $this->QuoteIdentifier($dbprefix . $queryinfo[0]);
return array("success" => true);
}
case "SHOW DATABASES":
{
// Swiped from: http://www.sqlite.org/faq.html#q7
$sql = "SELECT name FROM (SELECT * FROM sqlite_master UNION ALL SELECT * FROM sqlite_temp_master) WHERE type = 'table' ORDER BY name";
if (isset($queryinfo[0])) $queryinfo[0] = $this->GetDBPrefix($queryinfo[0]);
return array("success" => true, "filter_opts" => array("mode" => "SHOW DATABASES", "queryinfo" => $queryinfo, "names" => array()));
}
case "SHOW TABLES":
{
// Swiped from: http://www.sqlite.org/faq.html#q7
$sql = "SELECT " . (isset($queryinfo["FULL"]) && $queryinfo["FULL"] ? "*" : "name") . " FROM (SELECT *, 'normal' AS tbl_type FROM sqlite_master UNION ALL SELECT *, 'temp' AS tbl_type FROM sqlite_temp_master) WHERE type = 'table'" . (isset($queryinfo["LIKE"]) ? " AND name LIKE ?" : "") . " ORDER BY name";
if (isset($queryinfo[0]) && $queryinfo[0] == "") unset($queryinfo[0]);
if (isset($queryinfo["LIKE"])) $opts[] = $queryinfo["LIKE"];
return array("success" => true, "filter_opts" => array("mode" => "SHOW TABLES", "queryinfo" => $queryinfo));
}
case "SHOW CREATE DATABASE":
{
$sql = "SELECT name FROM (SELECT * FROM sqlite_master UNION ALL SELECT * FROM sqlite_temp_master) WHERE type = 'table' ORDER BY name";
$queryinfo[0] = (string)@substr((isset($queryinfo[0]) ? $this->GetDBPrefix($queryinfo[0]) : $this->dbprefix), 0, -2);
return array("success" => true, "filter_opts" => array("mode" => "SHOW CREATE DATABASE", "output" => false, "queryinfo" => $queryinfo));
}
case "SHOW CREATE TABLE":
{
$sql = "SELECT tbl_type, sql FROM (SELECT *, 'normal' AS tbl_type FROM sqlite_master UNION ALL SELECT *, 'temp' AS tbl_type FROM sqlite_temp_master) WHERE type = 'table' AND name = ?";
$opts = array($this->dbprefix . $queryinfo[0]);
return array("success" => true, "filter_opts" => array("mode" => "SHOW CREATE TABLE", "output" => false, "queryinfo" => $queryinfo, "hints" => (isset($queryinfo["EXPORT HINTS"]) ? $queryinfo["EXPORT HINTS"] : array())));
}
case "BULK IMPORT MODE":
{
$master = true;
if ($queryinfo)
{
$sql = array(
"PRAGMA synchronous=OFF",
"PRAGMA journal_mode=MEMORY",
"PRAGMA temp_store=MEMORY",
);
$opts = array(
array(),
array(),
array(),
);
}
else
{
$sql = array(
"PRAGMA synchronous=NORMAL",
"PRAGMA journal_mode=DELETE",
"PRAGMA temp_store=DEFAULT",
);
$opts = array(
array(),
array(),
array(),
);
}
return array("success" => true);
}
}
return array("success" => false, "error" => CSDB::DB_Translate("Unknown query command '%s'.", $cmd), "errorcode" => "unknown_query_command");
}
public function RunRowFilter(&$row, &$filteropts, &$fetchnext)
{
switch ($filteropts["mode"])
{
case "SHOW DATABASES":
{
if ($row !== false)
{
$name = $row->name;
$pos = strpos($name, "__");
if ($pos === false) $name = "";
else $name = substr($name, 0, $pos);
if (isset($filteropts["names"][$name])) $fetchnext = true;
else
{
$filteropts["names"][$name] = true;
$row->name = $name;
}
}
break;
}
case "SHOW TABLES":
{
if ($row !== false)
{
$dbprefix = (isset($filteropts["queryinfo"]["FROM"]) ? $this->GetDBPrefix($filteropts["queryinfo"]["FROM"]) : $this->dbprefix);
$name = $row->name;
if ($dbprefix == "" && strpos($name, "__") !== false) $fetchnext = true;
else if ($dbprefix != "" && strtolower(substr($name, 0, strlen($dbprefix))) !== strtolower($dbprefix)) $fetchnext = true;
else
{
$row->name = substr($name, strlen($dbprefix));
$row->tbl_name = $row->name;
}
}
break;
}
case "SHOW CREATE DATABASE":
{
if ($row !== false)
{
$name = $row->name;
$pos = strpos($name, "__");
if ($pos === false) $name = "";
else $name = substr($name, 0, $pos);
if ($filteropts["output"] || $name == "" || $name !== $filteropts["queryinfo"][0]) $fetchnext = true;
else
{
$row->name = $name;
$row->cmd = "CREATE DATABASE";
$row->opts = array($name);
$filteropts["output"] = true;
}
}
break;
}
case "SHOW CREATE TABLE":
{
if ($row !== false)
{
if ($filteropts["output"]) $fetchnext = true;
else
{
$dbprefix = ($row->tbl_type == "temp" ? "temp." : "");
// Process columns according to: http://sqlite.org/datatype3.html
$cols = array();
$result2 = $this->Query("PRAGMA", $dbprefix . "table_info(" . $this->QuoteIdentifier($this->dbprefix . $filteropts["queryinfo"][0]) . ")");
while ($row2 = $result2->NextRow())
{
if (isset($filteropts["hints"]) && isset($filteropts["hints"][$row2->name])) $col = $filteropts["hints"][$row2->name];
else
{
if (stripos($row2->type, "INT") !== false) $col = array("INTEGER", 8);
else if (stripos($row2->type, "CHAR") !== false || stripos($row2->type, "CLOB") !== false || stripos($row2->type, "TEXT") !== false)
{
$col = array("STRING", 4);
$pos = strpos($row2->type, "(");
if ($pos !== false)
{
$pos2 = strpos($row2->type, ")", $pos);
if ($pos2 !== false)
{
$num = (int)substr($row2->type, $pos + 1, $pos2 - $pos - 1);
if ($num > 0 && $num < 256) $col = array("STRING", 1, $num);
}
}
}
else if (stripos($row2->type, "BLOB") !== false || $row2->type === "") $col = array("BINARY", 4);
else if (stripos($row2->type, "REAL") !== false || stripos($row2->type, "FLOA") !== false || stripos($row2->type, "DOUB") !== false) $col = array("FLOAT", 8);
else
{
$col = array("NUMERIC");
$pos = strpos($row2->type, "(");
if ($pos !== false)
{
$pos2 = strpos($row2->type, ")", $pos);
if ($pos2 !== false)
{
$nums = explode(",", substr($row2->type, $pos + 1, $pos2 - $pos - 1));
$num = (int)trim($nums[0]);
if ($num > 0) $col[] = $num;
if (count($nums) > 1)
{
$num = (int)trim($nums[1]);
if ($num > 0) $col[] = $num;
}
}
}
}
if ($row2->notnull > 0) $col["NOT NULL"] = true;
if (isset($row2->dflt_value)) $col["DEFAULT"] = $row2->dflt_value;
if ($row2->pk > 0)
{
$col["PRIMARY KEY"] = true;
if ($col[0] == "INTEGER") $col["AUTO INCREMENT"] = true;
}
}
$cols[$row2->name] = $col;
}
// Process indexes.
$keys = array();
$result2 = $this->Query("PRAGMA", $dbprefix . "index_list(" . $this->QuoteIdentifier($this->dbprefix . $filteropts["queryinfo"][0]) . ")");
while ($row2 = $result2->NextRow())
{
$cols2 = array();
$result3 = $this->Query("PRAGMA", $dbprefix . "index_info(" . $this->QuoteIdentifier($row2->name) . ")");
while ($row3 = $result3->NextRow())
{
$cols2[] = $row3->name;
}
if (substr($row2->name, 0, strlen($this->dbprefix . $filteropts["queryinfo"][0]) + 2) == $this->dbprefix . $filteropts["queryinfo"][0] . "__") $row2->name = substr($row2->name, strlen($this->dbprefix . $filteropts["queryinfo"][0]) + 2);
$keys[] = array(($row2->unique > 0 ? "UNIQUE" : "KEY"), $cols2, "NAME" => $row2->name);
}
// Process foreign keys? It would be nice to see some output of foreign_key_list().
$row->cmd = "CREATE TABLE";
$row->opts = array($filteropts["queryinfo"][0], $cols);
if (count($keys)) $row->opts[] = $keys;
if ($row->tbl_type == "temp") $row->opts["TEMPORARY"] = true;
$row->opts["CHARACTER SET"] = "utf8";
$filteropts["output"] = true;
}
}
break;
}
}
if (!$fetchnext) parent::RunRowFilter($row, $filteropts, $fetchnext);
}
protected function ProcessColumnDefinition($info)
{
// SQLite is seriously limited here with just four data types.
$sql = "";
$type = strtoupper($info[0]);
switch ($type)
{
case "INTEGER": $sql .= " INTEGER"; break;
case "FLOAT": $sql .= " REAL"; break;
case "DECIMAL":
{
$sql .= " NUMERIC";
if (isset($info[1])) $sql .= "(" . $info[1] . (isset($info[2]) ? ", " . $info[2] : "") . ")";
break;
}
case "STRING":
{
$varbytes = $info[1];
if ($varbytes == 1) $sql .= " TEXT(" . $info[2] . ")";
else $sql .= " TEXT";
break;
}
case "BINARY": $sql .= " BLOB"; break;
case "DATE": $sql .= " TEXT"; break;
case "TIME": $sql .= " TEXT"; break;
case "DATETIME": $sql .= " TEXT"; break;
case "BOOLEAN": $sql .= " INTEGER"; break;
default: return array("success" => false, "error" => CSDB::DB_Translate("Unknown column type '%s'.", $type), "errorcode" => "unknown_column_type");
}
if (isset($info["NOT NULL"]) && $info["NOT NULL"]) $sql .= " NOT NULL";
if (isset($info["DEFAULT"])) $sql .= " DEFAULT " . $this->Quote($info["DEFAULT"]);
if (isset($info["PRIMARY KEY"]) && $info["PRIMARY KEY"])
{
$sql .= " PRIMARY KEY";
if (isset($info["AUTO INCREMENT"]) && $info["AUTO INCREMENT"]) $sql .= " AUTOINCREMENT";
}
if (isset($info["UNIQUE KEY"]) && $info["UNIQUE KEY"]) $sql .= " UNIQUE";
if (isset($info["REFERENCES"])) $sql .= " REFERENCES " . $this->ProcessReferenceDefinition($info["REFERENCES"]);
return array("success" => true, "sql" => $sql);
}
protected function ProcessKeyDefinition($info)
{
$sql = "";
if (isset($info["CONSTRAINT"])) $sql .= "CONSTRAINT " . $info["CONSTRAINT"] . " ";
$type = strtoupper($info[0]);
foreach ($info[1] as $num => $field) $info[1][$num] = $this->QuoteIdentifier($field);
switch ($type)
{
case "PRIMARY":
{
$sql .= "PRIMARY KEY";
$sql .= " (" . implode(", ", $info[1]) . ")";
break;
}
case "KEY":
{
// SQLite CREATE TABLE doesn't support regular KEY indexes, but ALTER TABLE does.
break;
}
case "UNIQUE":
{
$sql .= "UNIQUE";
$sql .= " (" . implode(", ", $info[1]) . ")";
break;
}
case "FULLTEXT":
{
// SQLite doesn't support FULLTEXT indexes.
break;
}
case "FOREIGN":
{
$sql .= "FOREIGN KEY";
$sql .= " (" . implode(", ", $info[1]) . ")";
$sql .= " REFERENCES " . $this->ProcessReferenceDefinition($info[2]);
break;
}
default: return array("success" => false, "error" => CSDB::DB_Translate("Unknown key type '%s'.", $type), "errorcode" => "unknown_key_type");;
}
return array("success" => true, "sql" => $sql);
}
private function GetDBPrefix($str)
{
$str = preg_replace('/\s+/', "_", trim(str_replace("_", " ", $str)));
return ($str != "" ? $str . "__" : "");
}
}
?>