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This patch adds support for SYS_REFCURSOR (a weakly typed cursor)
for both sql_mode=ORACLE and sql_mode=DEFAULT.
Works as a regular stored routine variable, parameter and return value:
- can be passed as an IN parameter to stored functions and procedures
- can be passed as an INOUT and OUT parameter to stored procedures
- can be returned from a stored function
Note, strongly typed REF CURSOR will be added separately.
Note, to maintain dependencies easier, some parts of sql_class.h
and item.h were moved to new header files:
- select_results.h:
class select_result_sink
class select_result
class select_result_interceptor
- sp_cursor.h:
class sp_cursor_statistics
class sp_cursor
- sp_rcontext_handler.h
class Sp_rcontext_handler and its descendants
The implementation consists of the following parts:
- A new class sp_cursor_array deriving from Dynamic_array
- A new class Statement_rcontext which contains data shared
between sub-statements of a compound statement.
It has a member m_statement_cursors of the sp_cursor_array data type,
as well as open cursor counter. THD inherits from Statement_rcontext.
- A new data type handler Type_handler_sys_refcursor in plugins/type_cursor/
It is designed to store uint16 references -
positions of the cursor in THD::m_statement_cursors.
- Type_handler_sys_refcursor suppresses some derived numeric features.
When a SYS_REFCURSOR variable is used as an integer an error is raised.
- A new abstract class sp_instr_fetch_cursor. It's needed to share
the common code between "OPEN cur" (for static cursors) and
"OPER cur FOR stmt" (for SYS_REFCURSORs).
- New sp_instr classes:
* sp_instr_copen_by_ref - OPEN sys_ref_curor FOR stmt;
* sp_instr_cfetch_by_ref - FETCH sys_ref_cursor INTO targets;
* sp_instr_cclose_by_ref - CLOSE sys_ref_cursor;
* sp_instr_destruct_variable - to destruct SYS_REFCURSOR variables when
the execution goes out of the BEGIN..END block
where SYS_REFCURSOR variables are declared.
- New methods in LEX:
* sp_open_cursor_for_stmt - handles "OPEN sys_ref_cursor FOR stmt".
* sp_add_instr_fetch_cursor - "FETCH cur INTO targets" for both
static cursors and SYS_REFCURSORs.
* sp_close - handles "CLOSE cur" both for static cursors and SYS_REFCURSORs.
- Changes in cursor functions to handle both static cursors and SYS_REFCURSORs:
* Item_func_cursor_isopen
* Item_func_cursor_found
* Item_func_cursor_notfound
* Item_func_cursor_rowcount
- A new system variable @@max_open_cursors - to limit the number
of cursors (static and SYS_REFCURSORs) opened at the same time.
Its allowed range is [0-65536], with 50 by default.
- A new virtual method Type_handler::can_return_bool() telling
if calling item->val_bool() is allowed for Items of this data type,
or if otherwise the "Illegal parameter for operation" error should be raised
at fix_fields() time.
- New methods in Sp_rcontext_handler:
* get_cursor()
* get_cursor_by_ref()
- A new class Sp_rcontext_handler_statement to handle top level statement
wide cursors which are shared by all substatements.
- A new virtual method expr_event_handler() in classes Item and Field.
It's needed to close (and make available for a new OPEN)
unused THD::m_statement_cursors elements which do not have any references
any more. It can happen in various moments in time, e.g.
* after evaluation parameters of an SQL routine
* after assigning a cursor expression into a SYS_REFCURSOR variable
* when leaving a BEGIN..END block with SYS_REFCURSOR variables
* after setting OUT/INOUT routine actual parameters from formal
parameters.
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| .. | ||
| anonymous_derived.result | ||
| binlog_ptr_mysqlbinlog.result | ||
| binlog_stm_ps.result | ||
| binlog_stm_sp.result | ||
| binlog_stm_sp_package.result | ||
| column_compression.result | ||
| custom_aggregate_functions.result | ||
| empty_string_literal.result | ||
| events.result | ||
| exception.result | ||
| func_add_months.result | ||
| func_case.result | ||
| func_concat.result | ||
| func_decode.result | ||
| func_length.result | ||
| func_misc.result | ||
| func_pad.result | ||
| func_qualified.result | ||
| func_regexp_replace.result | ||
| func_replace.result | ||
| func_substr.result | ||
| func_time.result | ||
| func_to_char.result | ||
| func_trim.result | ||
| gis-debug.result | ||
| gis.result | ||
| information_schema_parameters.result | ||
| keywords.result | ||
| lower_case_table_names.result | ||
| minus.result | ||
| misc.result | ||
| mysqldump_restore.result | ||
| mysqldump_restore_func_qualified.result | ||
| parser.result | ||
| plugin.result | ||
| ps.result | ||
| rpl_mariadb_date.result | ||
| rpl_sp_package.result | ||
| rpl_sp_package_variables.result | ||
| sequence.result | ||
| sp-anchor-row-type-table.result | ||
| sp-anchor-type.result | ||
| sp-anonymous.result | ||
| sp-code.result | ||
| sp-cursor-decl.result | ||
| sp-cursor-rowtype.result | ||
| sp-cursor.result | ||
| sp-default-param.result | ||
| sp-expr.result | ||
| sp-goto-debug.result | ||
| sp-goto.result | ||
| sp-inout.result | ||
| sp-memory-leak.result | ||
| sp-package-code.result | ||
| sp-package-concurrent-dml-db.result | ||
| sp-package-concurrent-dml-package.result | ||
| sp-package-concurrent-dml-trigger.result | ||
| sp-package-concurrent-dml-view.result | ||
| sp-package-i_s.result | ||
| sp-package-innodb.result | ||
| sp-package-mdl.result | ||
| sp-package-mysqldump.result | ||
| sp-package-security.result | ||
| sp-package.result | ||
| sp-param.result | ||
| sp-record.result | ||
| sp-row.result | ||
| sp-security.result | ||
| sp-sys_refcursor-alias.result | ||
| sp-sys_refcursor-func_hybrid.result | ||
| sp-sys_refcursor.result | ||
| sp.result | ||
| statement-expr.result | ||
| table_value_constr.result | ||
| trigger.result | ||
| truncate.result | ||
| type_blob.result | ||
| type_clob.result | ||
| type_date.result | ||
| type_number.result | ||
| type_raw.result | ||
| type_varchar.result | ||
| type_varchar2.result | ||
| update.result | ||
| update_innodb.result | ||
| variables.result | ||
| vcol.result | ||
| vcol_innodb.result | ||
| versioning.result | ||
| win.result | ||