MySQL  8.0.18
Source Code Documentation
Sql_cmd_dml Class Referenceabstract

#include <sql_cmd_dml.h>

Inheritance diagram for Sql_cmd_dml:
Sql_cmd Sql_cmd_call Sql_cmd_delete Sql_cmd_insert_base Sql_cmd_select Sql_cmd_update Sql_cmd_insert_select Sql_cmd_insert_values Sql_cmd_do

Public Member Functions

virtual bool is_data_change_stmt () const
 
virtual bool prepare (THD *thd)
 Command-specific resolving (doesn't include LEX::prepare()) More...
 
virtual bool execute (THD *thd)
 Execute this query once. More...
 
virtual bool is_dml () const
 
virtual bool is_single_table_plan () const
 
- Public Member Functions inherited from Sql_cmd
virtual enum_sql_command sql_command_code () const =0
 Return the command code for this statement. More...
 
bool is_prepared () const
 
virtual void cleanup (THD *thd)
 Command-specific reinitialization before execution of prepared statement. More...
 
void set_owner (Prepared_statement *stmt)
 Set the owning prepared statement. More...
 
Prepared_statementget_owner ()
 Get the owning prepared statement. More...
 
virtual void unprepare (THD *thd)
 Temporary function used to "unprepare" a prepared statement after preparation, so that a subsequent execute statement will reprepare it. More...
 
virtual bool accept (THD *thd, Select_lex_visitor *visitor)
 
virtual const MYSQL_LEX_CSTRINGeligible_secondary_storage_engine () const
 Is this statement of a type and on a form that makes it eligible for execution in a secondary storage engine? More...
 
void disable_secondary_storage_engine ()
 Disable use of secondary storage engines in this statement. More...
 
bool secondary_storage_engine_disabled () const
 Has use of secondary storage engines been disabled for this statement? More...
 
void use_secondary_storage_engine (const handlerton *hton)
 Mark the current statement as using a secondary storage engine. More...
 
bool using_secondary_storage_engine () const
 Is this statement using a secondary storage engine? More...
 
const handlertonsecondary_engine () const
 Get the handlerton of the secondary engine that is used for executing this statement, or nullptr if a secondary engine is not used. More...
 

Protected Member Functions

 Sql_cmd_dml ()
 
bool is_empty_query () const
 
void set_empty_query ()
 Set statement as returning no data. More...
 
virtual bool precheck (THD *thd)=0
 Perform a precheck of table privileges for the specific operation. More...
 
virtual bool prepare_inner (THD *thd)=0
 Perform the command-specific parts of DML command preparation, to be called from prepare() More...
 
virtual bool execute_inner (THD *thd)
 The inner parts of query optimization and execution. More...
 
- Protected Member Functions inherited from Sql_cmd
 Sql_cmd ()
 
virtual ~Sql_cmd ()
 
bool needs_explicit_preparation () const
 
void set_prepared ()
 Set this statement as prepared. More...
 

Protected Attributes

LEXlex
 Pointer to LEX for this statement. More...
 
Query_resultresult
 Pointer to object for handling of the result. More...
 
bool m_empty_query
 True if query will produce no rows. More...
 
- Protected Attributes inherited from Sql_cmd
bool prepare_only
 

Constructor & Destructor Documentation

◆ Sql_cmd_dml()

Sql_cmd_dml::Sql_cmd_dml ( )
inlineprotected

Member Function Documentation

◆ is_data_change_stmt()

virtual bool Sql_cmd_dml::is_data_change_stmt ( ) const
inlinevirtual
Returns
true if data change statement, false if not (SELECT statement)

Reimplemented in Sql_cmd_select, and Sql_cmd_call.

◆ is_dml()

virtual bool Sql_cmd_dml::is_dml ( ) const
inlinevirtual
Returns
true if SQL command is a DML statement

Reimplemented from Sql_cmd.

◆ is_empty_query()

bool Sql_cmd_dml::is_empty_query ( ) const
inlineprotected
Returns
true if query is guaranteed to return no data
  • Check empty query expression for INSERT

◆ is_single_table_plan()

virtual bool Sql_cmd_dml::is_single_table_plan ( ) const
inlinevirtual
Returns
true if implemented as single table plan, DML statement only

Reimplemented from Sql_cmd.

Reimplemented in Sql_cmd_insert_values, Sql_cmd_update, and Sql_cmd_delete.

◆ precheck()

virtual bool Sql_cmd_dml::precheck ( THD thd)
protectedpure virtual

Perform a precheck of table privileges for the specific operation.

Check that user has some relevant privileges for all tables involved in the statement, e.g. SELECT privileges for tables selected from, INSERT privileges for tables inserted into, etc. This function will also populate TABLE_LIST::grant with all privileges the user has for each table, which is later used during checking of column privileges. Note that at preparation time, views are not expanded yet. Privilege checking is thus rudimentary and must be complemented with later calls to SELECT_LEX::check_view_privileges(). The reason to call this function at such an early stage is to be able to quickly reject statements for which the user obviously has insufficient privileges.

Parameters
thdthread handler
Returns
false if success, true if false

Implemented in Sql_cmd_insert_base, Sql_cmd_update, Sql_cmd_delete, Sql_cmd_select, and Sql_cmd_call.

◆ prepare_inner()

virtual bool Sql_cmd_dml::prepare_inner ( THD thd)
protectedpure virtual

Perform the command-specific parts of DML command preparation, to be called from prepare()

Parameters
thdthe current thread
Returns
false if success, true if error

Implemented in Sql_cmd_insert_base, Sql_cmd_update, Sql_cmd_delete, Sql_cmd_select, and Sql_cmd_call.

◆ set_empty_query()

void Sql_cmd_dml::set_empty_query ( )
inlineprotected

Set statement as returning no data.

Member Data Documentation

◆ lex

LEX* Sql_cmd_dml::lex
protected

Pointer to LEX for this statement.

◆ m_empty_query

bool Sql_cmd_dml::m_empty_query
protected

True if query will produce no rows.

◆ result

Query_result* Sql_cmd_dml::result
protected

Pointer to object for handling of the result.


The documentation for this class was generated from the following files: