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datalib.php
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datalib.php
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<?PHP // $Id$
/// GLOBAL CONSTANTS /////////////////////////////////////////////////////////////
if ($SITE = get_site()) {
define('SITEID', $SITE->id);
} else {
define('SITEID', 1);
}
/// FUNCTIONS FOR DATABASE HANDLING ////////////////////////////////
/**
* execute a given sql command string
*
* Completely general function - it just runs some SQL and reports success.
*
* @param type description
*/
function execute_sql($command, $feedback=true) {
/// Completely general function - it just runs some SQL and reports success.
global $db;
$olddebug = $db->debug;
if (!$feedback) {
$db->debug = false;
}
$result = $db->Execute("$command");
$db->debug = $olddebug;
if ($result) {
if ($feedback) {
echo "<P><FONT COLOR=green><B>".get_string("success")."</B></FONT></P>";
}
return true;
} else {
if ($feedback) {
echo "<P><FONT COLOR=red><B>".get_string("error")."</B></FONT></P>";
}
return false;
}
}
/**
* on DBs that support it, switch to transaction mode and begin a transaction
* you'll need to ensure you call commit_sql() or your changes *will* be lost
* this is _very_ useful for massive updates
*/
function begin_sql() {
/// Completely general function - it just runs some SQL and reports success.
global $CFG;
if ($CFG->dbtype === 'postgres7') {
return execute_sql('BEGIN', false);
}
return true;
}
/**
* on DBs that support it, commit the transaction
*/
function commit_sql() {
/// Completely general function - it just runs some SQL and reports success.
global $CFG;
if ($CFG->dbtype === 'postgres7') {
return execute_sql('COMMIT', false);
}
return true;
}
/**
* Run an arbitrary sequence of semicolon-delimited SQL commands
*
* Assumes that the input text (file or string) consists of
* a number of SQL statements ENDING WITH SEMICOLONS. The
* semicolons MUST be the last character in a line.
* Lines that are blank or that start with "#" are ignored.
* Only tested with mysql dump files (mysqldump -p -d moodle)
*
* @param type description
*/
function modify_database($sqlfile="", $sqlstring="") {
global $CFG;
$success = true; // Let's be optimistic
if (!empty($sqlfile)) {
if (!is_readable($sqlfile)) {
$success = false;
echo "<P>Tried to modify database, but \"$sqlfile\" doesn't exist!</P>";
return $success;
} else {
$lines = file($sqlfile);
}
} else {
$sqlstring = trim($sqlstring);
if ($sqlstring{strlen($sqlstring)-1} != ";") {
$sqlstring .= ";"; // add it in if it's not there.
}
$lines[] = $sqlstring;
}
$command = "";
foreach ($lines as $line) {
$line = rtrim($line);
$length = strlen($line);
if ($length and $line[0] <> "#") {
if (substr($line, $length-1, 1) == ";") {
$line = substr($line, 0, $length-1); // strip ;
$command .= $line;
$command = str_replace("prefix_", $CFG->prefix, $command); // Table prefixes
if (! execute_sql($command)) {
$success = false;
}
$command = "";
} else {
$command .= $line;
}
}
}
return $success;
}
/// FUNCTIONS TO MODIFY TABLES ////////////////////////////////////////////
/**
* Add a new field to a table, or modify an existing one (if oldfield is defined).
*
* Add a new field to a table, or modify an existing one (if oldfield is defined).
*
* @param type description
*/
function table_column($table, $oldfield, $field, $type="integer", $size="10",
$signed="unsigned", $default="0", $null="not null", $after="") {
global $CFG, $db;
switch (strtolower($CFG->dbtype)) {
case "mysql":
case "mysqlt":
switch (strtolower($type)) {
case "text":
$type = "TEXT";
$signed = "";
break;
case "integer":
$type = "INTEGER($size)";
break;
case "varchar":
$type = "VARCHAR($size)";
$signed = "";
break;
}
if (!empty($oldfield)) {
$operation = "CHANGE $oldfield $field";
} else {
$operation = "ADD $field";
}
$default = "DEFAULT '$default'";
if (!empty($after)) {
$after = "AFTER `$after`";
}
return execute_sql("ALTER TABLE {$CFG->prefix}$table $operation $type $signed $default $null $after");
break;
case "postgres7": // From Petri Asikainen
//Check db-version
$dbinfo = $db->ServerInfo();
$dbver = substr($dbinfo['version'],0,3);
//to prevent conflicts with reserved words
$realfield = "\"$field\"";
$field = "\"${field}_alter_column_tmp\"";
$oldfield = "\"$oldfield\"";
switch (strtolower($type)) {
case "integer":
if ($size <= 4) {
$type = "INT2";
}
if ($size <= 10) {
$type = "INT";
}
if ($size > 10) {
$type = "INT8";
}
break;
case "varchar":
$type = "VARCHAR($size)";
break;
}
$default = "'$default'";
//After is not implemented in postgesql
//if (!empty($after)) {
// $after = "AFTER '$after'";
//}
//Use transactions
execute_sql("BEGIN");
//Allways use temporaly column
execute_sql("ALTER TABLE {$CFG->prefix}$table ADD COLUMN $field $type");
//Add default values
execute_sql("UPDATE {$CFG->prefix}$table SET $field=$default");
if ($dbver >= "7.3") {
// modifying 'not null' is posible before 7.3
//update default values to table
if ($null == "NOT NULL") {
execute_sql("UPDATE {$CFG->prefix}$table SET $field=$default where $field IS NULL");
execute_sql("ALTER TABLE {$CFG->prefix}$table ALTER COLUMN $field SET $null");
} else {
execute_sql("ALTER TABLE {$CFG->prefix}$table ALTER COLUMN $field DROP NOT NULL");
}
}
execute_sql("ALTER TABLE {$CFG->prefix}$table ALTER COLUMN $field SET DEFAULT $default");
if ( $oldfield != "\"\"" ) {
execute_sql("UPDATE {$CFG->prefix}$table SET $field = $oldfield");
execute_sql("ALTER TABLE {$CFG->prefix}$table drop column $oldfield");
}
execute_sql("ALTER TABLE {$CFG->prefix}$table RENAME COLUMN $field TO $realfield");
return execute_sql("COMMIT");
break;
default:
switch (strtolower($type)) {
case "integer":
$type = "INTEGER";
break;
case "varchar":
$type = "VARCHAR";
break;
}
$default = "DEFAULT '$default'";
if (!empty($after)) {
$after = "AFTER $after";
}
if (!empty($oldfield)) {
execute_sql("ALTER TABLE {$CFG->prefix}$table RENAME COLUMN $oldfield $field");
} else {
execute_sql("ALTER TABLE {$CFG->prefix}$table ADD COLUMN $field $type");
}
execute_sql("ALTER TABLE {$CFG->prefix}$table ALTER COLUMN $field SET $null");
return execute_sql("ALTER TABLE {$CFG->prefix}$table ALTER COLUMN $field SET $default");
break;
}
}
/// GENERIC FUNCTIONS TO CHECK AND COUNT RECORDS ////////////////////////////////////////
/**
* Returns true or false depending on whether the specified record exists
*
* Returns true or false depending on whether the specified record exists
*
* @param type description
*/
function record_exists($table, $field1="", $value1="", $field2="", $value2="", $field3="", $value3="") {
global $CFG;
if ($field1) {
$select = "WHERE $field1 = '$value1'";
if ($field2) {
$select .= " AND $field2 = '$value2'";
if ($field3) {
$select .= " AND $field3 = '$value3'";
}
}
} else {
$select = "";
}
return record_exists_sql("SELECT * FROM $CFG->prefix$table $select LIMIT 1");
}
/**
* Returns true or false depending on whether the specified record exists
*
* The sql statement is provided as a string.
*
* @param type description
*/
function record_exists_sql($sql) {
global $CFG, $db;
if (!$rs = $db->Execute($sql)) {
if (isset($CFG->debug) and $CFG->debug > 7) {
notify($db->ErrorMsg()."<br /><br />$sql");
}
return false;
}
if ( $rs->RecordCount() ) {
return true;
} else {
return false;
}
}
/**
* Get all the records and count them
*
* Get all the records and count them
*
* @param type description
*/
function count_records($table, $field1="", $value1="", $field2="", $value2="", $field3="", $value3="") {
global $CFG;
if ($field1) {
$select = "WHERE $field1 = '$value1'";
if ($field2) {
$select .= " AND $field2 = '$value2'";
if ($field3) {
$select .= " AND $field3 = '$value3'";
}
}
} else {
$select = "";
}
return count_records_sql("SELECT COUNT(*) FROM $CFG->prefix$table $select");
}
/**
* Get all the records and count them
*
* Get all the records and count them
*
* @param type description
*
*/
function count_records_select($table, $select="", $countitem="COUNT(*)") {
global $CFG;
if ($select) {
$select = "WHERE $select";
}
return count_records_sql("SELECT $countitem FROM $CFG->prefix$table $select");
}
/**
* Get all the records and count them
*
* The sql statement is provided as a string.
*
* @param type description
*/
function count_records_sql($sql) {
global $CFG, $db;
$rs = $db->Execute("$sql");
if (!$rs) {
if (isset($CFG->debug) and $CFG->debug > 7) {
notify($db->ErrorMsg()."<br /><br />$sql");
}
return 0;
}
return $rs->fields[0];
}
/// GENERIC FUNCTIONS TO GET, INSERT, OR UPDATE DATA ///////////////////////////////////
/**
* Get a single record as an object
*
* Get a single record as an object
*
* @param string $table the name of the table to select from
* @param string $field1 the name of the field for the first criteria
* @param string $value1 the value of the field for the first criteria
* @param string $field2 the name of the field for the second criteria
* @param string $value2 the value of the field for the second criteria
* @param string $field3 the name of the field for the third criteria
* @param string $value3 the value of the field for the third criteria
* @return object(fieldset) a fieldset object containing the first record selected
*/
function get_record($table, $field1, $value1, $field2="", $value2="", $field3="", $value3="") {
global $CFG;
$select = "WHERE $field1 = '$value1'";
if ($field2) {
$select .= " AND $field2 = '$value2'";
if ($field3) {
$select .= " AND $field3 = '$value3'";
}
}
return get_record_sql("SELECT * FROM $CFG->prefix$table $select");
}
/**
* Get a single record as an object
*
* The sql statement is provided as a string.
* A LIMIT is normally added to only look for 1 record
*
* @param type description
*/
function get_record_sql($sql) {
global $db, $CFG;
if (isset($CFG->debug) and $CFG->debug > 7) { // Debugging mode - don't use limit
$limit = "";
} else {
$limit = " LIMIT 1"; // Workaround - limit to one record
}
if (!$rs = $db->Execute("$sql$limit")) {
if (isset($CFG->debug) and $CFG->debug > 7) { // Debugging mode - print checks
notify( $db->ErrorMsg() . "<br /><br />$sql$limit" );
}
return false;
}
if (!$recordcount = $rs->RecordCount()) {
return false; // Found no records
}
if ($recordcount == 1) { // Found one record
return (object)$rs->fields;
} else { // Error: found more than one record
notify("Error: Turn off debugging to hide this error.");
notify("$sql$limit");
if ($records = $rs->GetAssoc(true)) {
notify("Found more than one record in get_record_sql !");
print_object($records);
} else {
notify("Very strange error in get_record_sql !");
print_object($rs);
}
print_continue("$CFG->wwwroot/admin/config.php");
}
}
/**
* Gets one record from a table, as an object
*
* "select" is a fragment of SQL to define the selection criteria
*
* @param type description
*/
function get_record_select($table, $select="", $fields="*") {
global $CFG;
if ($select) {
$select = "WHERE $select";
}
return get_record_sql("SELECT $fields FROM $CFG->prefix$table $select");
}
/**
* Get a number of records as an array of objects
*
* Can optionally be sorted eg "time ASC" or "time DESC"
* If "fields" is specified, only those fields are returned
* The "key" is the first column returned, eg usually "id"
* limitfrom and limitnum must both be specified or not at all
*
* @param type description
*/
function get_records($table, $field="", $value="", $sort="", $fields="*", $limitfrom="", $limitnum="") {
global $CFG;
if ($field) {
$select = "WHERE $field = '$value'";
} else {
$select = "";
}
if ($limitfrom !== "") {
switch ($CFG->dbtype) {
case "mysql":
$limit = "LIMIT $limitfrom,$limitnum";
break;
case "postgres7":
$limit = "LIMIT $limitnum OFFSET $limitfrom";
break;
default:
$limit = "LIMIT $limitnum,$limitfrom";
}
} else {
$limit = "";
}
if ($sort) {
$sort = "ORDER BY $sort";
}
return get_records_sql("SELECT $fields FROM $CFG->prefix$table $select $sort $limit");
}
/**
* Get a number of records as an array of objects
*
* Can optionally be sorted eg "time ASC" or "time DESC"
* "select" is a fragment of SQL to define the selection criteria
* The "key" is the first column returned, eg usually "id"
* limitfrom and limitnum must both be specified or not at all
*
* @param type description
*/
function get_records_select($table, $select="", $sort="", $fields="*", $limitfrom="", $limitnum="") {
global $CFG;
if ($select) {
$select = "WHERE $select";
}
if ($limitfrom !== "") {
switch ($CFG->dbtype) {
case "mysql":
$limit = "LIMIT $limitfrom,$limitnum";
break;
case "postgres7":
$limit = "LIMIT $limitnum OFFSET $limitfrom";
break;
default:
$limit = "LIMIT $limitnum,$limitfrom";
}
} else {
$limit = "";
}
if ($sort) {
$sort = "ORDER BY $sort";
}
return get_records_sql("SELECT $fields FROM $CFG->prefix$table $select $sort $limit");
}
/**
* Get a number of records as an array of objects
*
* Differs from get_records() in that the values variable
* can be a comma-separated list of values eg "4,5,6,10"
* Can optionally be sorted eg "time ASC" or "time DESC"
* The "key" is the first column returned, eg usually "id"
*
* @param type description
*/
function get_records_list($table, $field="", $values="", $sort="", $fields="*") {
global $CFG;
if ($field) {
$select = "WHERE $field in ($values)";
} else {
$select = "";
}
if ($sort) {
$sort = "ORDER BY $sort";
}
return get_records_sql("SELECT $fields FROM $CFG->prefix$table $select $sort");
}
/**
* Get a number of records as an array of objects
*
* The "key" is the first column returned, eg usually "id"
* The sql statement is provided as a string.
*
* @param type description
*/
function get_records_sql($sql) {
global $CFG,$db;
if (!$rs = $db->Execute($sql)) {
if (isset($CFG->debug) and $CFG->debug > 7) {
notify($db->ErrorMsg()."<br /><br />$sql");
}
return false;
}
if ( $rs->RecordCount() > 0 ) {
if ($records = $rs->GetAssoc(true)) {
foreach ($records as $key => $record) {
$objects[$key] = (object) $record;
}
return $objects;
} else {
return false;
}
} else {
return false;
}
}
/**
* Get a number of records as an array of objects
*
* Can optionally be sorted eg "time ASC" or "time DESC"
* If "fields" is specified, only those fields are returned
* The "key" is the first column returned, eg usually "id"
*
* @param type description
*/
function get_records_menu($table, $field="", $value="", $sort="", $fields="*") {
global $CFG;
if ($field) {
$select = "WHERE $field = '$value'";
} else {
$select = "";
}
if ($sort) {
$sort = "ORDER BY $sort";
}
return get_records_sql_menu("SELECT $fields FROM $CFG->prefix$table $select $sort");
}
/**
* Get a number of records as an array of objects
*
* Can optionally be sorted eg "time ASC" or "time DESC"
* "select" is a fragment of SQL to define the selection criteria
* Returns associative array of first two fields
*
* @param type description
*/
function get_records_select_menu($table, $select="", $sort="", $fields="*") {
global $CFG;
if ($select) {
$select = "WHERE $select";
}
if ($sort) {
$sort = "ORDER BY $sort";
}
return get_records_sql_menu("SELECT $fields FROM $CFG->prefix$table $select $sort");
}
/**
* Given an SQL select, this function returns an associative
*
* array of the first two columns. This is most useful in
* combination with the choose_from_menu function to create
* a form menu.
*
* @param type description
*/
function get_records_sql_menu($sql) {
global $CFG, $db;
if (!$rs = $db->Execute($sql)) {
if (isset($CFG->debug) and $CFG->debug > 7) {
notify($db->ErrorMsg()."<br /><br />$sql");
}
return false;
}
if ( $rs->RecordCount() > 0 ) {
while (!$rs->EOF) {
$menu[$rs->fields[0]] = $rs->fields[1];
$rs->MoveNext();
}
return $menu;
} else {
return false;
}
}
/**
* Get a single field from a database record
*
* longdesc
*
* @param type description
*/
function get_field($table, $return, $field1, $value1, $field2="", $value2="", $field3="", $value3="") {
global $db, $CFG;
$select = "WHERE $field1 = '$value1'";
if ($field2) {
$select .= " AND $field2 = '$value2'";
if ($field3) {
$select .= " AND $field3 = '$value3'";
}
}
$rs = $db->Execute("SELECT $return FROM $CFG->prefix$table $select");
if (!$rs) {
if (isset($CFG->debug) and $CFG->debug > 7) {
notify($db->ErrorMsg()."<br /><br />SELECT $return FROM $CFG->prefix$table $select");
}
return false;
}
if ( $rs->RecordCount() == 1 ) {
return $rs->fields["$return"];
} else {
return false;
}
}
/**
* Get a single field from a database record
*
* longdesc
*
* @param type description
*/
function get_field_sql($sql) {
global $db, $CFG;
$rs = $db->Execute($sql);
if (!$rs) {
if (isset($CFG->debug) and $CFG->debug > 7) {
notify($db->ErrorMsg()."<br /><br />$sql");
}
return false;
}
if ( $rs->RecordCount() == 1 ) {
return $rs->fields[0];
} else {
return false;
}
}
/**
* Set a single field in a database record
*
* longdesc
*
* @param type description
*/
function set_field($table, $newfield, $newvalue, $field1, $value1, $field2="", $value2="", $field3="", $value3="") {
global $db, $CFG;
$select = "WHERE $field1 = '$value1'";
if ($field2) {
$select .= " AND $field2 = '$value2'";
if ($field3) {
$select .= " AND $field3 = '$value3'";
}
}
return $db->Execute("UPDATE $CFG->prefix$table SET $newfield = '$newvalue' $select");
}
/**
* Delete one or more records from a table
*
* Delete one or more records from a table
*
* @param type description
*/
function delete_records($table, $field1="", $value1="", $field2="", $value2="", $field3="", $value3="") {
global $db, $CFG;
if ($field1) {
$select = "WHERE $field1 = '$value1'";
if ($field2) {
$select .= " AND $field2 = '$value2'";
if ($field3) {
$select .= " AND $field3 = '$value3'";
}
}
} else {
$select = "";
}
return $db->Execute("DELETE FROM $CFG->prefix$table $select");
}
/**
* Delete one or more records from a table
*
* "select" is a fragment of SQL to define the selection criteria
*
* @param type description
*/
function delete_records_select($table, $select="") {
global $CFG, $db;
if ($select) {
$select = "WHERE $select";
}
return $db->Execute("DELETE FROM $CFG->prefix$table $select");
}
/**
* Insert a record into a table and return the "id" field if required
*
* If the return ID isn't required, then this just reports success as true/false.
* $dataobject is an object containing needed data
*
* @param type description
*/
function insert_record($table, $dataobject, $returnid=true, $primarykey='id') {
global $db, $CFG;
/// Execute a dummy query to get an empty recordset
if (!$rs = $db->Execute("SELECT * FROM $CFG->prefix$table WHERE $primarykey ='-1'")) {
return false;
}
/// Get the correct SQL from adoDB
if (!$insertSQL = $db->GetInsertSQL($rs, (array)$dataobject, true)) {
return false;
}
/// Run the SQL statement
if (!$rs = $db->Execute($insertSQL)) {
if (isset($CFG->debug) and $CFG->debug > 7) {
notify($db->ErrorMsg()."<br /><br />$insertSQL");
}
return false;
}
/// If a return ID is not needed then just return true now
if (!$returnid) {
return true;
}
/// Find the return ID of the newly inserted record
switch ($CFG->dbtype) {
case "postgres7": // Just loves to be special
$oid = $db->Insert_ID();
if ($rs = $db->Execute("SELECT $primarykey FROM $CFG->prefix$table WHERE oid = $oid")) {
if ($rs->RecordCount() == 1) {
return (integer) $rs->fields[0];
}
}
return false;
default:
return $db->Insert_ID(); // Should work on most databases, but not all!
}
}
/**
* Update a record in a table
*
* $dataobject is an object containing needed data
* Relies on $dataobject having a variable "id" to
* specify the record to update
*
* @param type description
*/
function update_record($table, $dataobject) {
global $db, $CFG;
if (! isset($dataobject->id) ) {
return false;
}
// Determine all the fields in the table
if (!$columns = $db->MetaColumns("$CFG->prefix$table")) {
return false;
}
$data = (array)$dataobject;
// Pull out data matching these fields
foreach ($columns as $column) {
if ($column->name <> "id" and isset($data[$column->name]) ) {
$ddd[$column->name] = $data[$column->name];
}
}
// Construct SQL queries
$numddd = count($ddd);
$count = 0;
$update = "";
foreach ($ddd as $key => $value) {
$count++;
$update .= "$key = '$value'";
if ($count < $numddd) {
$update .= ", ";
}
}
if ($rs = $db->Execute("UPDATE $CFG->prefix$table SET $update WHERE id = '$dataobject->id'")) {
return true;
} else {
if (isset($CFG->debug) and $CFG->debug > 7) {
notify($db->ErrorMsg()."<br /><br />UPDATE $CFG->prefix$table SET $update WHERE id = '$dataobject->id'");
}
return false;
}
}
/// USER DATABASE ////////////////////////////////////////////////
/**
* Get a complete user record, which includes all the info
*
* in the user record, as well as membership information
* Suitable for setting as $USER session cookie.
*
* @param type description
*/
function get_user_info_from_db($field, $value) {
global $CFG;
if (!$field or !$value) {
return false;
}
/// Get all the basic user data
if (! $user = get_record_select("user", "$field = '$value' AND deleted <> '1'")) {
return false;
}
/// Add membership information
if ($admins = get_records("user_admins", "userid", $user->id)) {
$user->admin = true;
}
if ($site = get_site()) {
$user->student[$site->id] = isstudent($site->id, $user->id);
}
/// Determine enrolments based on current enrolment module