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Developer Documentation
Developer Documentation
- Bug fixes for general core bugs in 4.2.x will end 22 April 2024 (12 months).
- Bug fixes for security issues in 4.2.x will end 7 October 2024 (18 months).
- PHP version: minimum PHP 8.0.0 Note: minimum PHP version has increased since Moodle 4.1. PHP 8.1.x is supported too.
/lib/dml/ -> oci_native_moodle_database.php (source)
Differences Between: [Versions 310 and 402] [Versions 311 and 402] [Versions 39 and 402] [Versions 400 and 402] [Versions 401 and 402] [Versions 402 and 403]
Native oci class representing moodle database interface.
| Copyright: | 2008 Petr Skoda (http://skodak.org) |
| License: | http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| File Size: | 1907 lines (79 kb) |
| Included or required: | 0 times |
| Referenced: | 0 times |
| Includes or requires: | 3 files lib/dml/oci_native_moodle_temptables.php lib/dml/oci_native_moodle_recordset.php lib/dml/moodle_database.php |
Defines 1 class
oci_native_moodle_database:: (70 methods):
driver_installed()
get_dbfamily()
get_dbtype()
get_dblibrary()
get_name()
get_configuration_help()
diagnose()
connect()
dispose()
query_start()
query_end()
get_server_info()
fix_table_names()
allowed_param_types()
get_last_error()
parse_query()
tweak_param_names()
get_tables()
get_indexes()
fetch_columns()
normalise_value()
get_limit_sql()
oracle_dirty_hack()
compare_by_length_desc()
setup_is_unicodedb()
change_database_structure()
bind_params()
free_descriptors()
onespace2empty()
execute()
get_record_sql()
get_recordset_sql()
create_recordset()
get_records_sql()
get_fieldset_sql()
insert_record_raw()
insert_record()
import_record()
update_record_raw()
update_record()
set_field_select()
delete_records_select()
sql_null_from_clause()
sql_bitand()
sql_bitnot()
sql_bitor()
sql_bitxor()
sql_modulo()
sql_cast_to_char()
sql_cast_char2int()
sql_cast_char2real()
sql_like()
sql_concat()
sql_concat_join()
sql_group_concat()
sql_order_by_null()
get_in_or_equal()
recursive_concat()
sql_position()
sql_isempty()
sql_order_by_text()
oci_package_installed()
attempt_oci_package_install()
replace_all_text_supported()
session_lock_supported()
get_session_lock()
release_session_lock()
begin_transaction()
commit_transaction()
rollback_transaction()
Class: oci_native_moodle_database - X-Ref
Native oci class representing moodle database interface.One complete reference for PHP + OCI:
http://www.oracle.com/technology/tech/php/underground-php-oracle-manual.html
| driver_installed() X-Ref |
| Detects if all needed PHP stuff installed. Note: can be used before connect() return: mixed true if ok, string if something |
| get_dbfamily() X-Ref |
| Returns database family type - describes SQL dialect Note: can be used before connect() return: string db family name (mysql, postgres, mssql, oracle, etc.) |
| get_dbtype() X-Ref |
| Returns more specific database driver type Note: can be used before connect() return: string db type mysqli, pgsql, oci, mssql, sqlsrv |
| get_dblibrary() X-Ref |
| Returns general database library name Note: can be used before connect() return: string db type pdo, native |
| get_name() X-Ref |
| Returns localised database type name Note: can be used before connect() return: string |
| get_configuration_help() X-Ref |
| Returns localised database configuration help. Note: can be used before connect() return: string |
| diagnose() X-Ref |
| Diagnose database and tables, this function is used to verify database and driver settings, db engine types, etc. return: string null means everything ok, string means problem found. |
| connect($dbhost, $dbuser, $dbpass, $dbname, $prefix, array $dboptions=null) X-Ref |
| Connect to db Must be called before other methods. param: string $dbhost The database host. param: string $dbuser The database username. param: string $dbpass The database username's password. param: string $dbname The name of the database being connected to. param: mixed $prefix string means moodle db prefix, false used for external databases where prefix not used param: array $dboptions driver specific options return: bool true |
| dispose() X-Ref |
| Close database connection and release all resources and memory (especially circular memory references). Do NOT use connect() again, create a new instance if needed. |
| query_start($sql, ?array $params, $type, $extrainfo=null) X-Ref |
| Called before each db query. param: string $sql param: array|null $params An array of parameters. param: int $type type of query param: mixed $extrainfo driver specific extra information return: void |
| query_end($result, $stmt=null) X-Ref |
| Called immediately after each db query. param: mixed db specific result return: void |
| get_server_info() X-Ref |
| Returns database server info array return: array Array containing 'description' and 'version' info |
| fix_table_names($sql) X-Ref |
| Converts short table name {tablename} to real table name supporting temp tables ($this->unique_session_id based) if detected param: string sql return: string sql |
| allowed_param_types() X-Ref |
| Returns supported query parameter types return: int bitmask of accepted SQL_PARAMS_* |
| get_last_error() X-Ref |
| Returns last error reported by database engine. return: string error message |
| parse_query($sql) X-Ref |
| Prepare the statement for execution param: string $sql return: resource |
| tweak_param_names($sql, array $params) X-Ref |
| Make sure there are no reserved words in param names... param: string $sql param: array $params return: array ($sql, $params) updated query and parameters |
| get_tables($usecache=true) X-Ref |
| Return tables in database WITHOUT current prefix param: bool $usecache if true, returns list of cached tables. return: array of table names in lowercase and without prefix |
| get_indexes($table) X-Ref |
| Return table indexes - everything lowercased. param: string $table The table we want to get indexes from. return: array An associative array of indexes containing 'unique' flag and 'columns' being indexed |
| fetch_columns(string $table) X-Ref |
| Fetches detailed information about columns in table. param: string $table name return: array array of database_column_info objects indexed with column names |
| normalise_value($column, $value) X-Ref |
| Normalise values based in RDBMS dependencies (booleans, LOBs...) param: database_column_info $column column metadata corresponding with the value we are going to normalise param: mixed $value value we are going to normalise return: mixed the normalised value |
| get_limit_sql($sql, array $params = null, $limitfrom=0, $limitnum=0) X-Ref |
| Transforms the sql and params in order to emulate the LIMIT clause available in other DBs param: string $sql the SQL select query to execute. param: array $params array of sql parameters param: int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set). param: int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set). return: array with the transformed sql and params updated |
| oracle_dirty_hack($table, $field, $value) X-Ref |
| This function will handle all the column values before being inserted/updated to DB for Oracle installations. This is because the "special feature" of Oracle where the empty string is equal to NULL and this presents a problem with all our currently NOT NULL default '' fields. (and with empties handling in general) Note that this function is 100% private and should be used, exclusively by DML functions in this file. Also, this is considered a DIRTY HACK to be removed when possible. This function is private and must not be used outside this driver at all param: $table string the table where the record is going to be inserted/updated (without prefix) param: $field string the field where the record is going to be inserted/updated param: $value mixed the value to be inserted/updated |
| compare_by_length_desc($a, $b) X-Ref |
| Helper function to order by string length desc param: $a string first element to compare param: $b string second element to compare return: int < 0 $a goes first (is less), 0 $b goes first, 0 doesn't matter |
| setup_is_unicodedb() X-Ref |
| Is db in unicode mode? return: bool |
| change_database_structure($sql, $tablenames = null) X-Ref |
| Do NOT use in code, to be used by database_manager only! param: string|array $sql query param: array|null $tablenames an array of xmldb table names affected by this request. return: bool true |
| bind_params($stmt, array &$params=null, $tablename=null, array &$descriptors = null) X-Ref |
| No description |
| free_descriptors($descriptors) X-Ref |
| No description |
| onespace2empty(&$item, $key=null) X-Ref |
| This function is used to convert all the Oracle 1-space defaults to the empty string like a really DIRTY HACK to allow it to work better until all those NOT NULL DEFAULT '' fields will be out from Moodle. param: string the string to be converted to '' (empty string) if it's ' ' (one space) param: mixed the key of the array in case we are using this function from array_walk, return: boolean always true (the converted variable is returned by reference) |
| execute($sql, array $params=null) X-Ref |
| Execute general sql query. Should be used only when no other method suitable. Do NOT use this to make changes in db structure, use database_manager methods instead! param: string $sql query param: array $params query parameters return: bool true |
| get_record_sql($sql, array $params=null, $strictness=IGNORE_MISSING) X-Ref |
| Get a single database record as an object using a SQL statement. The SQL statement should normally only return one record. It is recommended to use get_records_sql() if more matches possible! param: string $sql The SQL string you wish to be executed, should normally only return one record. param: array $params array of sql parameters param: int $strictness IGNORE_MISSING means compatible mode, false returned if record not found, debug message if more found; return: mixed a fieldset object containing the first matching record, false or exception if error not found depending on mode |
| get_recordset_sql($sql, array $params=null, $limitfrom=0, $limitnum=0) X-Ref |
| Get a number of records as a moodle_recordset using a SQL statement. Since this method is a little less readable, use of it should be restricted to code where it's possible there might be large datasets being returned. For known small datasets use get_records_sql - it leads to simpler code. The return type is like: param: string $sql the SQL select query to execute. param: array $params array of sql parameters param: int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set). param: int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set). return: moodle_recordset instance |
| create_recordset($stmt) X-Ref |
| No description |
| get_records_sql($sql, array $params=null, $limitfrom=0, $limitnum=0) X-Ref |
| Get a number of records as an array of objects using a SQL statement. Return value is like: param: string $sql the SQL select query to execute. The first column of this SELECT statement param: array $params array of sql parameters param: int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set). param: int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set). return: array of objects, or empty array if no records were found |
| get_fieldset_sql($sql, array $params=null) X-Ref |
| Selects records and return values (first field) as an array using a SQL statement. param: string $sql The SQL query param: array $params array of sql parameters return: array of values |
| insert_record_raw($table, $params, $returnid=true, $bulk=false, $customsequence=false) X-Ref |
| Insert new record into database, as fast as possible, no safety checks, lobs not supported. param: string $table name param: mixed $params data record as object or array param: bool $returnit return it of inserted record param: bool $bulk true means repeated inserts expected param: bool $customsequence true if 'id' included in $params, disables $returnid return: bool|int true or new id |
| insert_record($table, $dataobject, $returnid=true, $bulk=false) X-Ref |
| Insert a record into a table and return the "id" field if required. Some conversions and safety checks are carried out. Lobs are supported. If the return ID isn't required, then this just reports success as true/false. $data is an object containing needed data param: string $table The database table to be inserted into param: object|array $dataobject A data object with values for one or more fields in the record param: bool $returnid Should the id of the newly created record entry be returned? If this option is not requested then true/false is returned. return: bool|int true or new id |
| import_record($table, $dataobject) X-Ref |
| Import a record into a table, id field is required. Safety checks are NOT carried out. Lobs are supported. param: string $table name of database table to be inserted into param: object $dataobject A data object with values for one or more fields in the record return: bool true |
| update_record_raw($table, $params, $bulk=false) X-Ref |
| Update record in database, as fast as possible, no safety checks, lobs not supported. param: string $table name param: stdClass|array $params data record as object or array param: bool true means repeated updates expected return: bool true |
| update_record($table, $dataobject, $bulk=false) X-Ref |
| 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: string $table The database table to be checked against. param: stdClass|array $dataobject An object with contents equal to fieldname=>fieldvalue. param: bool true means repeated updates expected return: bool true |
| set_field_select($table, $newfield, $newvalue, $select, array $params=null) X-Ref |
| Set a single field in every table record which match a particular WHERE clause. param: string $table The database table to be checked against. param: string $newfield the field to set. param: string $newvalue the value to set the field to. param: string $select A fragment of SQL to be used in a where clause in the SQL call. param: array $params array of sql parameters return: bool true |
| delete_records_select($table, $select, array $params=null) X-Ref |
| Delete one or more records from a table which match a particular WHERE clause. param: string $table The database table to be checked against. param: string $select A fragment of SQL to be used in a where clause in the SQL call (used to define the selection criteria). param: array $params array of sql parameters return: bool true |
| sql_null_from_clause() X-Ref |
| No description |
| sql_bitand($int1, $int2) X-Ref |
| No description |
| sql_bitnot($int1) X-Ref |
| No description |
| sql_bitor($int1, $int2) X-Ref |
| No description |
| sql_bitxor($int1, $int2) X-Ref |
| No description |
| sql_modulo($int1, $int2) X-Ref |
| Returns the SQL text to be used in order to perform module '%' operation - remainder after division param: integer int1 first integer in the operation param: integer int2 second integer in the operation return: string the piece of SQL code to be used in your statement. |
| sql_cast_to_char(string $field) X-Ref |
| Return SQL for casting to char of given field/expression param: string $field Table field or SQL expression to be cast return: string |
| sql_cast_char2int($fieldname, $text=false) X-Ref |
| No description |
| sql_cast_char2real($fieldname, $text=false) X-Ref |
| No description |
| sql_like($fieldname, $param, $casesensitive = true, $accentsensitive = true, $notlike = false, $escapechar = '\\') X-Ref |
| Returns 'LIKE' part of a query. param: string $fieldname usually name of the table column param: string $param usually bound query parameter (?, :named) param: bool $casesensitive use case sensitive search param: bool $accensensitive use accent sensitive search (not all databases support accent insensitive) param: bool $notlike true means "NOT LIKE" param: string $escapechar escape char for '%' and '_' return: string SQL code fragment |
| sql_concat() X-Ref |
| No description |
| sql_concat_join($separator="' '", $elements = array() X-Ref |
| No description |
| sql_group_concat(string $field, string $separator = ', ', string $sort = '') X-Ref |
| Return SQL for performing group concatenation on given field/expression param: string $field param: string $separator param: string $sort return: string |
| sql_order_by_null(string $fieldname, int $sort = SORT_ASC) X-Ref |
| Returns the SQL text to be used to order by columns, standardising the return pattern of null values across database types to sort nulls first when ascending and last when descending. param: string $fieldname The name of the field we need to sort by. param: int $sort An order to sort the results in. return: string The piece of SQL code to be used in your statement. |
| get_in_or_equal($items, $type=SQL_PARAMS_QM, $prefix='param', $equal=true, $onemptyitems=false) X-Ref |
| Constructs 'IN()' or '=' sql fragment Method overriding {@link moodle_database::get_in_or_equal} to be able to get more than 1000 elements working, to avoid ORA-01795. We use a pivoting technique to be able to transform the params into virtual rows, so the original IN() expression gets transformed into a subquery. Once more, be noted that we shouldn't be using ever get_in_or_equal() with such number of parameters (proper subquery and/or chunking should be used instead). param: mixed $items A single value or array of values for the expression. param: int $type Parameter bounding type : SQL_PARAMS_QM or SQL_PARAMS_NAMED. param: string $prefix Named parameter placeholder prefix (a unique counter value is appended to each parameter name). param: bool $equal True means we want to equate to the constructed expression, false means we don't want to equate to it. param: mixed $onemptyitems This defines the behavior when the array of items provided is empty. Defaults to false, return: array A list containing the constructed sql fragment and an array of parameters. |
| recursive_concat(array $args) X-Ref |
| Mega hacky magic to work around crazy Oracle NULL concats. param: array $args return: string |
| sql_position($needle, $haystack) X-Ref |
| Returns the SQL for returning searching one string for the location of another. |
| sql_isempty($tablename, $fieldname, $nullablefield, $textfield) X-Ref |
| Returns the SQL to know if one field is empty. param: string $tablename Name of the table (without prefix). Not used for now but can be param: string $fieldname Name of the field we are going to check param: bool $nullablefield For specifying if the field is nullable (true) or no (false) in the DB. param: bool $textfield For specifying if it is a text (also called clob) field (true) or a varchar one (false) return: string the sql code to be added to check for empty values |
| sql_order_by_text($fieldname, $numchars=32) X-Ref |
| No description |
| oci_package_installed() X-Ref |
| Is the required OCI server package installed? return: bool |
| attempt_oci_package_install() X-Ref |
| Try to add required moodle package into oracle server. |
| replace_all_text_supported() X-Ref |
| Does this driver support tool_replace? return: bool |
| session_lock_supported() X-Ref |
| No description |
| get_session_lock($rowid, $timeout) X-Ref |
| Obtain session lock param: int $rowid id of the row with session record param: int $timeout max allowed time to wait for the lock in seconds return: void |
| release_session_lock($rowid) X-Ref |
| No description |
| begin_transaction() X-Ref |
| Driver specific start of real database transaction, this can not be used directly in code. return: void |
| commit_transaction() X-Ref |
| Driver specific commit of real database transaction, this can not be used directly in code. return: void |
| rollback_transaction() X-Ref |
| Driver specific abort of real database transaction, this can not be used directly in code. return: void |
