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sql_load.cc
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/*
Copyright (c) 2000, 2020, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/* Copy data from a text file to table */
#include "sql/sql_load.h"
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
// Execute_load_query_log_event,
// LOG_EVENT_UPDATE_TABLE_MAP_VERSION_F
#include <string.h>
#include <sys/types.h>
#include <algorithm>
#include <atomic>
#include "libbinlogevents/include/load_data_events.h"
#include "m_ctype.h"
#include "m_string.h"
#include "my_base.h"
#include "my_bitmap.h"
#include "my_dbug.h"
#include "my_dir.h"
#include "my_inttypes.h"
#include "my_io.h"
#include "my_loglevel.h"
#include "my_macros.h"
#include "my_sys.h"
#include "my_thread_local.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/psi/mysql_file.h"
#include "mysql/service_mysql_alloc.h"
#include "mysql/thread_type.h"
#include "mysql_com.h"
#include "mysqld_error.h"
#include "sql/auth/auth_acls.h"
#include "sql/auth/auth_common.h"
#include "sql/binlog.h"
#include "sql/derror.h"
#include "sql/error_handler.h" // Ignore_error_handler
#include "sql/field.h"
#include "sql/handler.h"
#include "sql/item.h"
#include "sql/item_func.h"
#include "sql/item_timefunc.h" // Item_func_now_local
#include "sql/log.h"
#include "sql/log_event.h" // Delete_file_log_event,
#include "sql/mysqld.h" // mysql_real_data_home
#include "sql/protocol.h"
#include "sql/protocol_classic.h"
#include "sql/psi_memory_key.h"
#include "sql/query_result.h"
#include "sql/rpl_rli.h" // Relay_log_info
#include "sql/rpl_slave.h"
#include "sql/sql_base.h" // fill_record_n_invoke_before_triggers
#include "sql/sql_class.h"
#include "sql/sql_error.h"
#include "sql/sql_insert.h" // check_that_all_fields_are_given_values,
#include "sql/sql_lex.h"
#include "sql/sql_list.h"
#include "sql/sql_show.h"
#include "sql/sql_view.h" // check_key_in_view
#include "sql/system_variables.h"
#include "sql/table.h"
#include "sql/table_trigger_dispatcher.h" // Table_trigger_dispatcher
#include "sql/thr_malloc.h"
#include "sql/transaction_info.h"
#include "sql/trigger_def.h"
#include "sql_string.h"
#include "thr_lock.h"
class READ_INFO;
using std::max;
using std::min;
class XML_TAG {
public:
int level;
String field;
String value;
XML_TAG(int l, String f, String v);
};
XML_TAG::XML_TAG(int l, String f, String v) {
level = l;
field.append(f);
value.append(v);
}
#define GET (stack_pos != stack ? *--stack_pos : my_b_get(&cache))
#define PUSH(A) *(stack_pos++) = (A)
class READ_INFO {
File file;
uchar *buffer, /* Buffer for read text */
*end_of_buff; /* Data in bufferts ends here */
uint buff_length; /* Length of buffer */
const uchar *field_term_ptr, *line_term_ptr;
const char *line_start_ptr, *line_start_end;
size_t field_term_length, line_term_length, enclosed_length;
int field_term_char, line_term_char, enclosed_char, escape_char;
int *stack, *stack_pos;
bool found_end_of_line, start_of_line, eof;
bool need_end_io_cache;
IO_CACHE cache;
int level; /* for load xml */
public:
bool error, line_truncated, found_null, enclosed;
uchar *row_start, /* Found row starts here */
*row_end; /* Found row ends here */
const CHARSET_INFO *read_charset;
READ_INFO(File file, uint tot_length, const CHARSET_INFO *cs,
const String &field_term, const String &line_start,
const String &line_term, const String &enclosed, int escape,
bool get_it_from_net, bool is_fifo);
~READ_INFO();
bool read_field();
bool read_fixed_length();
bool next_line();
char unescape(char chr);
bool terminator(const uchar *ptr, size_t length);
bool find_start_of_fields();
/* load xml */
List<XML_TAG> taglist;
int read_value(int delim, String *val);
int read_cdata(String *val, bool *have_cdata);
bool read_xml();
void clear_level(int level);
/*
We need to force cache close before destructor is invoked to log
the last read block
*/
void end_io_cache() {
::end_io_cache(&cache);
need_end_io_cache = false;
}
/*
Either this method, or we need to make cache public
Arg must be set from Sql_cmd_load_table::execute_inner()
since constructor does not see either the table or THD value
*/
void set_io_cache_arg(void *arg) { cache.arg = arg; }
/**
skip all data till the eof.
*/
void skip_data_till_eof() {
while (GET != my_b_EOF)
;
}
};
/**
Execute LOAD DATA query
@param thd Current thread.
@param handle_duplicates Indicates whenever we should emit error or
replace row if we will meet duplicates.
@returns true if error
*/
bool Sql_cmd_load_table::execute_inner(THD *thd,
enum enum_duplicates handle_duplicates) {
char name[FN_REFLEN];
File file;
bool error = false;
const String *field_term = m_exchange.field.field_term;
const String *escaped = m_exchange.field.escaped;
const String *enclosed = m_exchange.field.enclosed;
bool is_fifo = false;
SELECT_LEX *select = thd->lex->select_lex;
LOAD_FILE_INFO lf_info;
THD::killed_state killed_status = THD::NOT_KILLED;
bool is_concurrent;
bool transactional_table;
TABLE_LIST *const table_list = thd->lex->query_tables;
const char *db = table_list->db; // This is never null
/*
If path for file is not defined, we will use the current database.
If this is not set, we will use the directory where the table to be
loaded is located
*/
const char *tdb = thd->db().str ? thd->db().str : db; // Result is never null
ulong skip_lines = m_exchange.skip_lines;
DBUG_TRACE;
/*
Bug #34283
mysqlbinlog leaves tmpfile after termination if binlog contains
load data infile, so in mixed mode we go to row-based for
avoiding the problem.
*/
thd->set_current_stmt_binlog_format_row_if_mixed();
if (escaped->length() > 1 || enclosed->length() > 1) {
my_error(ER_WRONG_FIELD_TERMINATORS, MYF(0));
return true;
}
/* Report problems with non-ascii separators */
if (!escaped->is_ascii() || !enclosed->is_ascii() ||
!field_term->is_ascii() || !m_exchange.line.line_term->is_ascii() ||
!m_exchange.line.line_start->is_ascii()) {
push_warning(thd, Sql_condition::SL_WARNING,
WARN_NON_ASCII_SEPARATOR_NOT_IMPLEMENTED,
ER_THD(thd, WARN_NON_ASCII_SEPARATOR_NOT_IMPLEMENTED));
}
if (open_and_lock_tables(thd, table_list, 0)) return true;
THD_STAGE_INFO(thd, stage_executing);
if (select->setup_tables(thd, table_list, false)) return true;
if (run_before_dml_hook(thd)) return true;
if (table_list->is_view() && select->resolve_placeholder_tables(thd, false))
return true; /* purecov: inspected */
TABLE_LIST *const insert_table_ref =
table_list->is_updatable() && // View must be updatable
!table_list
->is_multiple_tables() && // Multi-table view not allowed
!table_list->is_derived()
? // derived tables not allowed
table_list->updatable_base_table()
: nullptr;
if (insert_table_ref == nullptr ||
check_key_in_view(thd, table_list, insert_table_ref)) {
my_error(ER_NON_UPDATABLE_TABLE, MYF(0), table_list->alias, "LOAD");
return true;
}
if (select->derived_table_count &&
select->check_view_privileges(thd, INSERT_ACL, SELECT_ACL))
return true; /* purecov: inspected */
if (table_list->is_merged()) {
if (table_list->prepare_check_option(thd)) return true;
if (handle_duplicates == DUP_REPLACE &&
table_list->prepare_replace_filter(thd))
return true;
}
// Pass the check option down to the underlying table:
insert_table_ref->check_option = table_list->check_option;
/*
Let us emit an error if we are loading data to table which is used
in subselect in SET clause like we do it for INSERT.
The main thing to fix to remove this restriction is to ensure that the
table is marked to be 'used for insert' in which case we should never
mark this table as 'const table' (ie, one that has only one row).
*/
if (unique_table(insert_table_ref, table_list->next_global, false)) {
my_error(ER_UPDATE_TABLE_USED, MYF(0), table_list->table_name);
return true;
}
TABLE *const table = insert_table_ref->table;
for (Field **cur_field = table->field; *cur_field; ++cur_field)
(*cur_field)->reset_warnings();
transactional_table = table->file->has_transactions();
is_concurrent =
(table_list->lock_descriptor().type == TL_WRITE_CONCURRENT_INSERT);
if (m_opt_fields_or_vars.empty()) {
Field_iterator_table_ref field_iterator;
field_iterator.set(table_list);
for (; !field_iterator.end_of_fields(); field_iterator.next()) {
Item *item;
if (!(item = field_iterator.create_item(thd))) return true;
if (item->field_for_view_update() == nullptr) {
my_error(ER_NONUPDATEABLE_COLUMN, MYF(0), item->item_name.ptr());
return true;
}
m_opt_fields_or_vars.push_back(item->real_item());
}
bitmap_set_all(table->write_set);
/*
Let us also prepare SET clause, altough it is probably empty
in this case.
*/
if (setup_fields(thd, /*want_privilege=*/INSERT_ACL,
/*allow_sum_func=*/false, /*split_sum_funcs=*/false,
/*column_update=*/true, /*typed_items=*/nullptr,
&m_opt_set_fields, Ref_item_array()) ||
setup_fields(thd, /*want_privilege=*/SELECT_ACL,
/*allow_sum_func=*/false, /*split_sum_funcs=*/false,
/*column_update=*/false, /*typed_items=*/nullptr,
&m_opt_set_exprs, Ref_item_array()))
return true;
} else { // Part field list
/*
Because m_opt_fields_or_vars may contain user variables,
pass false for column_update in first call below.
*/
if (setup_fields(thd, /*want_privilege=*/INSERT_ACL,
/*allow_sum_func=*/false, /*split_sum_funcs=*/false,
/*column_update=*/false, /*typed_items=*/nullptr,
&m_opt_fields_or_vars, Ref_item_array()) ||
setup_fields(thd, /*want_privilege=*/INSERT_ACL,
/*allow_sum_func=*/false, /*split_sum_funcs=*/false,
/*column_update=*/true, /*typed_items=*/nullptr,
&m_opt_set_fields, Ref_item_array()))
return true;
/*
Special updatability test is needed because m_opt_fields_or_vars may
contain a mix of column references and user variables.
*/
for (Item *item : m_opt_fields_or_vars) {
if ((item->type() == Item::FIELD_ITEM ||
item->type() == Item::REF_ITEM) &&
item->field_for_view_update() == nullptr) {
my_error(ER_NONUPDATEABLE_COLUMN, MYF(0), item->item_name.ptr());
return true;
}
if (item->type() == Item::STRING_ITEM) {
/*
This item represents a user variable. Create a new item with the
same name that can be added to LEX::set_var_list. This ensures
that corresponding Item_func_get_user_var items are resolved as
non-const items.
*/
Item_func_set_user_var *user_var =
new (thd->mem_root) Item_func_set_user_var(item->item_name, item);
if (user_var == nullptr) return true;
thd->lex->set_var_list.push_back(user_var);
}
}
// Consider the following table:
//
// CREATE TABLE t1 (x DOUBLE, y DOUBLE, g POINT SRID 4326 NOT NULL);
//
// If the user wants to load a file which only contains two values (x and y
// coordinates), it is possible to do it by executing the following
// statement:
//
// LOAD DATA INFILE 'data' (@x, @y)
// SET x = @x, y = @y, g = ST_SRID(POINT(@x, @y));
//
// However, the columns that are specified in the SET clause are only marked
// in the write set, and not in fields_set_during_insert. The latter is the
// bitmap used during check_that_all_fields_are_given_values(), so we need
// to copy the bits from the write set over to said bitmap. If not, the
// server will return an error saying that column 'g' doesn't have a default
// value.
bitmap_union(table->fields_set_during_insert, table->write_set);
if (check_that_all_fields_are_given_values(thd, table, table_list))
return true;
/* Fix the expressions in SET clause */
if (setup_fields(thd, /*want_privilege=*/SELECT_ACL,
/*allow_sum_func=*/false, /*split_sum_funcs=*/false,
/*column_update=*/false, /*typed_items=*/nullptr,
&m_opt_set_exprs, Ref_item_array()))
return true;
}
const int escape_char =
(escaped->length() &&
(m_exchange.escaped_given() ||
!(thd->variables.sql_mode & MODE_NO_BACKSLASH_ESCAPES)))
? (*escaped)[0]
: INT_MAX;
/*
* LOAD DATA INFILE fff INTO TABLE xxx SET columns2
sets all columns, except if file's row lacks some: in that case,
defaults are set by read_fixed_length() and read_sep_field(),
not by COPY_INFO.
* LOAD DATA INFILE fff INTO TABLE xxx (columns1) SET columns2=
may need a default for columns other than columns1 and columns2.
*/
const bool manage_defaults = !m_opt_fields_or_vars.empty();
COPY_INFO info(COPY_INFO::INSERT_OPERATION, &m_opt_fields_or_vars,
&m_opt_set_fields, manage_defaults, handle_duplicates,
escape_char);
if (info.add_function_default_columns(table, table->write_set)) return true;
if (table->triggers) {
if (table->triggers->mark_fields(TRG_EVENT_INSERT)) return true;
}
prepare_triggers_for_insert_stmt(thd, table);
uint tot_length = 0;
bool use_blobs = false, use_vars = false;
for (Item *item : m_opt_fields_or_vars) {
const Item *real_item = item->real_item();
if (real_item->type() == Item::FIELD_ITEM) {
const Field *field = down_cast<const Item_field *>(real_item)->field;
if (field->is_flag_set(BLOB_FLAG)) {
use_blobs = true;
tot_length += 256; // Will be extended if needed
} else
tot_length += field->field_length;
} else if (item->type() == Item::STRING_ITEM)
use_vars = true;
}
if (use_blobs && m_exchange.line.line_term->is_empty() &&
field_term->is_empty()) {
my_error(ER_BLOBS_AND_NO_TERMINATED, MYF(0));
return true;
}
if (use_vars && !field_term->length() && !enclosed->length()) {
my_error(ER_LOAD_FROM_FIXED_SIZE_ROWS_TO_VAR, MYF(0));
return true;
}
if (m_is_local_file) {
(void)net_request_file(thd->get_protocol_classic()->get_net(),
m_exchange.file_name);
file = -1;
} else {
if (!dirname_length(m_exchange.file_name)) {
strxnmov(name, FN_REFLEN - 1, mysql_real_data_home, tdb, NullS);
(void)fn_format(name, m_exchange.file_name, name, "",
MY_RELATIVE_PATH | MY_UNPACK_FILENAME);
} else {
(void)fn_format(
name, m_exchange.file_name, mysql_real_data_home, "",
MY_RELATIVE_PATH | MY_UNPACK_FILENAME | MY_RETURN_REAL_PATH);
}
if ((thd->system_thread &
(SYSTEM_THREAD_SLAVE_SQL | SYSTEM_THREAD_SLAVE_WORKER)) != 0) {
Relay_log_info *rli = thd->rli_slave->get_c_rli();
if (strncmp(rli->slave_patternload_file, name,
rli->slave_patternload_file_size)) {
/*
LOAD DATA INFILE in the slave SQL Thread can only read from
--slave-load-tmpdir". This should never happen. Please, report a bug.
*/
LogErr(ERROR_LEVEL, ER_LOAD_DATA_INFILE_FAILED_IN_UNEXPECTED_WAY);
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--slave-load-tmpdir");
return true;
}
} else if (!is_secure_file_path(name)) {
/* Read only allowed from within dir specified by secure_file_priv */
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--secure-file-priv");
return true;
}
#if !defined(_WIN32)
MY_STAT stat_info;
if (!my_stat(name, &stat_info, MYF(MY_WME))) return true;
// if we are not in slave thread, the file must be:
if (!thd->slave_thread &&
!((stat_info.st_mode & S_IFLNK) != S_IFLNK && // symlink
((stat_info.st_mode & S_IFREG) == S_IFREG || // regular file
(stat_info.st_mode & S_IFIFO) == S_IFIFO))) // named pipe
{
my_error(ER_TEXTFILE_NOT_READABLE, MYF(0), name);
return true;
}
if ((stat_info.st_mode & S_IFIFO) == S_IFIFO) is_fifo = true;
#endif
if ((file = mysql_file_open(key_file_load, name, O_RDONLY, MYF(MY_WME))) <
0)
return true;
}
READ_INFO read_info(
file, tot_length,
m_exchange.cs ? m_exchange.cs : thd->variables.collation_database,
*field_term, *m_exchange.line.line_start, *m_exchange.line.line_term,
*enclosed, info.escape_char, m_is_local_file, is_fifo);
if (read_info.error) {
if (file >= 0) mysql_file_close(file, MYF(0)); // no files in net reading
return true; // Can't allocate buffers
}
if (mysql_bin_log.is_open()) {
lf_info.thd = thd;
lf_info.logged_data_file = false;
lf_info.last_pos_in_file = HA_POS_ERROR;
lf_info.log_delayed = transactional_table;
read_info.set_io_cache_arg((void *)&lf_info);
}
thd->check_for_truncated_fields = CHECK_FIELD_WARN;
thd->num_truncated_fields = 0L;
/* Skip lines if there is a line terminator */
if (m_exchange.line.line_term->length() &&
m_exchange.filetype != FILETYPE_XML) {
/* m_exchange.skip_lines needs to be preserved for logging */
while (skip_lines > 0) {
skip_lines--;
if (read_info.next_line()) break;
}
}
if (!(error = read_info.error)) {
table->next_number_field = table->found_next_number_field;
if (thd->lex->is_ignore() || handle_duplicates == DUP_REPLACE)
table->file->ha_extra(HA_EXTRA_IGNORE_DUP_KEY);
if (handle_duplicates == DUP_REPLACE &&
(!table->triggers || !table->triggers->has_delete_triggers()))
table->file->ha_extra(HA_EXTRA_WRITE_CAN_REPLACE);
if (thd->locked_tables_mode <= LTM_LOCK_TABLES)
table->file->ha_start_bulk_insert((ha_rows)0);
table->copy_blobs = true;
if (m_exchange.filetype == FILETYPE_XML) /* load xml */
error =
read_xml_field(thd, info, insert_table_ref, read_info, skip_lines);
else if (!field_term->length() && !enclosed->length())
error =
read_fixed_length(thd, info, insert_table_ref, read_info, skip_lines);
else
error = read_sep_field(thd, info, insert_table_ref, read_info, *enclosed,
skip_lines);
if (thd->locked_tables_mode <= LTM_LOCK_TABLES &&
table->file->ha_end_bulk_insert() && !error) {
table->file->print_error(my_errno(), MYF(0));
error = true;
}
table->next_number_field = nullptr;
}
if (file >= 0) mysql_file_close(file, MYF(0));
free_blobs(table); /* if pack_blob was used */
table->copy_blobs = false;
thd->check_for_truncated_fields = CHECK_FIELD_IGNORE;
/*
simulated killing in the middle of per-row loop
must be effective for binlogging
*/
DBUG_EXECUTE_IF("simulate_kill_bug27571", {
error = true;
thd->killed = THD::KILL_QUERY;
};);
killed_status = error ? thd->killed.load() : THD::NOT_KILLED;
if (error) {
if (m_is_local_file) read_info.skip_data_till_eof();
if (mysql_bin_log.is_open()) {
{
/*
Make sure last block (the one which caused the error) gets
logged. This is needed because otherwise after write of (to
the binlog, not to read_info (which is a cache))
Delete_file_log_event the bad block will remain in read_info
(because pre_read is not called at the end of the last
block; remember pre_read is called whenever a new block is
read from disk). At the end of Sql_cmd_load_table::execute_inner(),
the destructor of read_info will call end_io_cache() which will flush
read_info, so we will finally have this in the binlog:
Append_block # The last successful block
Delete_file
Append_block # The failing block
which is nonsense.
Or could also be (for a small file)
Create_file # The failing block
which is nonsense (Delete_file is not written in this case, because:
Create_file has not been written, so Delete_file is not written, then
when read_info is destroyed end_io_cache() is called which writes
Create_file.
*/
read_info.end_io_cache();
/* If the file was not empty, wrote_create_file is true */
if (lf_info.logged_data_file) {
int errcode = query_error_code(thd, killed_status == THD::NOT_KILLED);
/* since there is already an error, the possible error of
writing binary log will be ignored */
if (thd->get_transaction()->cannot_safely_rollback(
Transaction_ctx::STMT))
(void)write_execute_load_query_log_event(
thd, table_list->db, table_list->table_name, is_concurrent,
handle_duplicates, transactional_table, errcode);
else {
Delete_file_log_event d(thd, db, transactional_table);
(void)mysql_bin_log.write_event(&d);
}
}
}
}
error = true; // Error on read
goto err;
}
snprintf(name, sizeof(name), ER_THD(thd, ER_LOAD_INFO),
(long)info.stats.records, (long)info.stats.deleted,
(long)(info.stats.records - info.stats.copied),
(long)thd->get_stmt_da()->current_statement_cond_count());
if (mysql_bin_log.is_open()) {
/*
We need to do the job that is normally done inside
binlog_query() here, which is to ensure that the pending event
is written before tables are unlocked and before any other
events are written. We also need to update the table map
version for the binary log to mark that table maps are invalid
after this point.
*/
if (thd->is_current_stmt_binlog_format_row())
error = thd->binlog_flush_pending_rows_event(true, transactional_table);
else {
/*
As already explained above, we need to call end_io_cache() or the last
block will be logged only after Execute_load_query_log_event (which is
wrong), when read_info is destroyed.
*/
read_info.end_io_cache();
if (lf_info.logged_data_file) {
int errcode = query_error_code(thd, killed_status == THD::NOT_KILLED);
error = write_execute_load_query_log_event(
thd, table_list->db, table_list->table_name, is_concurrent,
handle_duplicates, transactional_table, errcode);
}
}
if (error) goto err;
}
/* ok to client sent only after binlog write and engine commit */
my_ok(thd, info.stats.copied + info.stats.deleted, 0L, name);
err:
DBUG_ASSERT(
table->file->has_transactions() ||
!(info.stats.copied || info.stats.deleted) ||
thd->get_transaction()->cannot_safely_rollback(Transaction_ctx::STMT));
table->file->ha_release_auto_increment();
return error;
}
/**
@note Not a very useful function; just to avoid duplication of code
@returns true if error
*/
bool Sql_cmd_load_table::write_execute_load_query_log_event(
THD *thd, const char *db_arg, const char *table_name_arg,
bool is_concurrent, enum enum_duplicates duplicates,
bool transactional_table, int errcode) {
const char *tbl = table_name_arg;
const char *tdb = (thd->db().str != nullptr ? thd->db().str : db_arg);
const String *query = nullptr;
String string_buf;
size_t fname_start = 0;
size_t fname_end = 0;
if (thd->db().str == nullptr || strcmp(db_arg, thd->db().str)) {
/*
If used database differs from table's database,
prefix table name with database name so that it
becomes a FQ name.
*/
string_buf.set_charset(system_charset_info);
append_identifier(thd, &string_buf, db_arg, strlen(db_arg));
string_buf.append(".");
}
append_identifier(thd, &string_buf, table_name_arg, strlen(table_name_arg));
tbl = string_buf.c_ptr_safe();
Load_query_generator gen(thd, &m_exchange, tdb, tbl, is_concurrent,
duplicates == DUP_REPLACE, thd->lex->is_ignore());
query = gen.generate(&fname_start, &fname_end);
Execute_load_query_log_event e(
thd, query->ptr(), query->length(), fname_start, fname_end,
(duplicates == DUP_REPLACE)
? binary_log::LOAD_DUP_REPLACE
: (thd->lex->is_ignore() ? binary_log::LOAD_DUP_IGNORE
: binary_log::LOAD_DUP_ERROR),
transactional_table, false, false, errcode);
return mysql_bin_log.write_event(&e);
}
namespace {
/**
Checks if an item is a hidden generated column.
@param table Pointer to TABLE object
@param item Item to check
@returns true if checked item is a hidden generated column.
*/
inline bool is_hidden_generated_column(TABLE *table, Item *item) {
Item *real_item = item->real_item();
if (table->has_gcol() && real_item->type() == Item::FIELD_ITEM) {
const Field *field = down_cast<Item_field *>(real_item)->field;
if (bitmap_is_set(&table->fields_for_functional_indexes,
field->field_index()))
return true;
}
return false;
}
} // namespace
/**
Read of rows of fixed size + optional garbage + optional newline
@param thd Pointer to THD object
@param info Pointer to COPY_INFO object
@param table_list Pointer to TABLE_LIST object
@param read_info Pointer to READ_INFO object
@param skip_lines Number of ignored lines
at the start of the file.
@returns true if error
*/
bool Sql_cmd_load_table::read_fixed_length(THD *thd, COPY_INFO &info,
TABLE_LIST *table_list,
READ_INFO &read_info,
ulong skip_lines) {
TABLE *table = table_list->table;
bool err;
DBUG_TRACE;
while (!read_info.read_fixed_length()) {
if (thd->killed) {
thd->send_kill_message();
return true;
}
if (skip_lines) {
/*
We could implement this with a simple seek if:
- We are not using DATA INFILE LOCAL
- escape character is ""
- line starting prefix is ""
*/
skip_lines--;
continue;
}
uchar *pos = read_info.row_start;
restore_record(table, s->default_values);
/*
Check whether default values of the fields not specified in column list
are correct or not.
*/
if (validate_default_values_of_unset_fields(thd, table)) {
read_info.error = true;
break;
}
Autoinc_field_has_explicit_non_null_value_reset_guard after_each_row(table);
for (Item *item : m_opt_fields_or_vars) {
// Skip hidden generated columns.
if (is_hidden_generated_column(table, item)) continue;
/*
There is no variables in fields_vars list in this format so
this conversion is safe (no need to check for STRING_ITEM).
*/
DBUG_ASSERT(item->real_item()->type() == Item::FIELD_ITEM);
Item_field *sql_field = static_cast<Item_field *>(item->real_item());
Field *field = sql_field->field;
if (field == table->next_number_field)
table->autoinc_field_has_explicit_non_null_value = true;
/*
No fields specified in fields_vars list can be null in this format.
Mark field as not null, we should do this for each row because of
restore_record...
*/
field->set_notnull();
if (pos == read_info.row_end) {
thd->num_truncated_fields++; /* Not enough fields */
push_warning_printf(thd, Sql_condition::SL_WARNING,
ER_WARN_TOO_FEW_RECORDS,
ER_THD(thd, ER_WARN_TOO_FEW_RECORDS),
thd->get_stmt_da()->current_row_for_condition());
if (field->type() == FIELD_TYPE_TIMESTAMP && !field->is_nullable()) {
// Specific of TIMESTAMP NOT NULL: set to CURRENT_TIMESTAMP.
Item_func_now_local::store_in(field);
}
} else {
uint length;
uchar save_chr;
if ((length = (uint)(read_info.row_end - pos)) > field->field_length)
length = field->field_length;
save_chr = pos[length];
pos[length] = '\0'; // Safeguard aganst malloc
field->store((char *)pos, length, read_info.read_charset);
pos[length] = save_chr;
if ((pos += length) > read_info.row_end)
pos = read_info.row_end; /* Fills rest with space */
}
}
if (pos != read_info.row_end) {
thd->num_truncated_fields++; /* Too long row */
push_warning_printf(thd, Sql_condition::SL_WARNING,
ER_WARN_TOO_MANY_RECORDS,
ER_THD(thd, ER_WARN_TOO_MANY_RECORDS),
thd->get_stmt_da()->current_row_for_condition());
}
if (thd->killed || fill_record_n_invoke_before_triggers(
thd, &info, m_opt_set_fields, m_opt_set_exprs, table,
TRG_EVENT_INSERT, table->s->fields, true, nullptr))
return true;
switch (table_list->view_check_option(thd)) {
case VIEW_CHECK_SKIP:
read_info.next_line();
goto continue_loop;
case VIEW_CHECK_ERROR:
return true;
}
if (invoke_table_check_constraints(thd, table)) {
if (thd->is_error()) return true;
// continue when IGNORE clause is used.
read_info.next_line();
goto continue_loop;
}
err = write_record(thd, table, &info, nullptr);
if (err) return true;
/*
We don't need to reset auto-increment field since we are restoring
its default value at the beginning of each loop iteration.
*/
if (read_info.next_line()) // Skip to next line
break;
if (read_info.line_truncated) {
thd->num_truncated_fields++; /* Too long row */
push_warning_printf(thd, Sql_condition::SL_WARNING,
ER_WARN_TOO_MANY_RECORDS,
ER_THD(thd, ER_WARN_TOO_MANY_RECORDS),
thd->get_stmt_da()->current_row_for_condition());
}
thd->get_stmt_da()->inc_current_row_for_condition();
continue_loop:;
}
return read_info.error;
}
class Field_tmp_nullability_guard {
public:
explicit Field_tmp_nullability_guard(Item *item) : m_field(nullptr) {
if (item->type() == Item::FIELD_ITEM) {
m_field = ((Item_field *)item)->field;
/*
Enable temporary nullability for items that corresponds
to table fields.
*/
m_field->set_tmp_nullable();
}
}
~Field_tmp_nullability_guard() {
if (m_field) m_field->reset_tmp_nullable();
}
private:
Field *m_field;
};
/**
Read rows in delimiter-separated formats.
@param thd Pointer to THD object
@param info Pointer to COPY_INFO object
@param table_list Pointer to TABLE_LIST object
@param read_info Pointer to READ_INFO object
@param enclosed ENCLOSED BY character
@param skip_lines Number of ignored lines
at the start of the file.
@returns true if error
*/
bool Sql_cmd_load_table::read_sep_field(THD *thd, COPY_INFO &info,
TABLE_LIST *table_list,
READ_INFO &read_info,
const String &enclosed,
ulong skip_lines) {
TABLE *table = table_list->table;
size_t enclosed_length;
bool err;
DBUG_TRACE;
enclosed_length = enclosed.length();
for (;;) {
if (thd->killed) {
thd->send_kill_message();
return true;
}
restore_record(table, s->default_values);
/*
Check whether default values of the fields not specified in column list
are correct or not.
*/
if (validate_default_values_of_unset_fields(thd, table)) {
read_info.error = true;
break;
}
Autoinc_field_has_explicit_non_null_value_reset_guard after_each_row(table);
auto it = m_opt_fields_or_vars.begin();
for (; it != m_opt_fields_or_vars.end(); ++it) {
Item *item = *it;
uint length;
uchar *pos;
Item *real_item;
// Skip hidden generated columns.
if (is_hidden_generated_column(table, item)) continue;
if (read_info.read_field()) break;
/* If this line is to be skipped we don't want to fill field or var */
if (skip_lines) continue;
pos = read_info.row_start;
length = (uint)(read_info.row_end - pos);
real_item = item->real_item();
Field_tmp_nullability_guard fld_tmp_nullability_guard(real_item);
if ((!read_info.enclosed && (enclosed_length && length == 4 &&
!memcmp(pos, STRING_WITH_LEN("NULL")))) ||
(length == 1 && read_info.found_null)) {
if (real_item->type() == Item::FIELD_ITEM) {
Field *field = ((Item_field *)real_item)->field;
if (field->reset()) // Set to 0
{
my_error(ER_WARN_NULL_TO_NOTNULL, MYF(0), field->field_name,
thd->get_stmt_da()->current_row_for_condition());
return true;
}
if (!field->is_nullable() && field->type() == FIELD_TYPE_TIMESTAMP) {
// Specific of TIMESTAMP NOT NULL: set to CURRENT_TIMESTAMP.
Item_func_now_local::store_in(field);
} else {
/*
Set field to NULL. Later we will clear temporary nullability flag
and check NOT NULL constraint.
*/
field->set_null();
}
} else if (item->type() == Item::STRING_ITEM) {
DBUG_ASSERT(nullptr !=
dynamic_cast<Item_user_var_as_out_param *>(item));
((Item_user_var_as_out_param *)item)
->set_null_value(read_info.read_charset);
}
continue;
}
if (real_item->type() == Item::FIELD_ITEM) {
Field *field = ((Item_field *)real_item)->field;
field->set_notnull();
read_info.row_end[0] = 0; // Safe to change end marker
if (field == table->next_number_field)
table->autoinc_field_has_explicit_non_null_value = true;
field->store((char *)pos, length, read_info.read_charset);
} else if (item->type() == Item::STRING_ITEM) {
DBUG_ASSERT(nullptr !=
dynamic_cast<Item_user_var_as_out_param *>(item));
((Item_user_var_as_out_param *)item)