sql_load.cc
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:20k
- /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- 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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- /* Copy data from a textfile to table */
- #include "mysql_priv.h"
- #include <my_dir.h>
- #include <m_ctype.h>
- class READ_INFO {
- File file;
- byte *buffer, /* Buffer for read text */
- *end_of_buff; /* Data in bufferts ends here */
- uint buff_length, /* Length of buffert */
- max_length; /* Max length of row */
- char *field_term_ptr,*line_term_ptr,*line_start_ptr,*line_start_end;
- uint 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;
- IO_CACHE cache;
- NET *io_net;
- public:
- bool error,line_cuted,found_null,enclosed;
- byte *row_start, /* Found row starts here */
- *row_end; /* Found row ends here */
- READ_INFO(File file,uint tot_length,
- String &field_term,String &line_start,String &line_term,
- String &enclosed,int escape,bool get_it_from_net, bool is_fifo);
- ~READ_INFO();
- int read_field();
- int read_fixed_length(void);
- int next_line(void);
- char unescape(char chr);
- int terminator(char *ptr,uint length);
- bool find_start_of_fields();
- };
- static int read_fixed_length(THD *thd,COPY_INFO &info,TABLE *table,
- List<Item> &fields, READ_INFO &read_info);
- static int read_sep_field(THD *thd,COPY_INFO &info,TABLE *table,
- List<Item> &fields, READ_INFO &read_info,
- String &enclosed);
- int mysql_load(THD *thd,sql_exchange *ex,TABLE_LIST *table_list,
- List<Item> &fields, enum enum_duplicates handle_duplicates,
- bool read_file_from_client,thr_lock_type lock_type)
- {
- char name[FN_REFLEN];
- File file;
- TABLE *table;
- int error;
- uint save_skip_lines = ex->skip_lines;
- String *field_term=ex->field_term,*escaped=ex->escaped,
- *enclosed=ex->enclosed;
- bool is_fifo=0;
- DBUG_ENTER("mysql_load");
- if (escaped->length() > 1 || enclosed->length() > 1)
- {
- my_message(ER_WRONG_FIELD_TERMINATORS,ER(ER_WRONG_FIELD_TERMINATORS),
- MYF(0));
- DBUG_RETURN(-1);
- }
- if (!(table = open_ltable(thd,table_list,lock_type)))
- DBUG_RETURN(-1);
- if (!fields.elements)
- {
- Field **field;
- for (field=table->field; *field ; field++)
- fields.push_back(new Item_field(*field));
- }
- else
- { // Part field list
- thd->dupp_field=0;
- if (setup_fields(thd,table_list,fields,1,0) < 0)
- DBUG_RETURN(-1);
- if (thd->dupp_field)
- {
- my_error(ER_FIELD_SPECIFIED_TWICE, MYF(0), thd->dupp_field->field_name);
- DBUG_RETURN(-1);
- }
- }
- uint tot_length=0;
- bool use_blobs=0,use_timestamp=0;
- List_iterator<Item> it(fields);
- Item_field *field;
- while ((field=(Item_field*) it++))
- {
- if (field->field->flags & BLOB_FLAG)
- {
- use_blobs=1;
- tot_length+=256; // Will be extended if needed
- }
- else
- tot_length+=field->field->field_length;
- if (!field_term->length() && !(field->field->flags & NOT_NULL_FLAG))
- field->field->set_notnull();
- if (field->field == table->timestamp_field)
- use_timestamp=1;
- }
- if (use_blobs && !ex->line_term->length() && !field_term->length())
- {
- my_message(ER_BLOBS_AND_NO_TERMINATED,ER(ER_BLOBS_AND_NO_TERMINATED),
- MYF(0));
- DBUG_RETURN(-1);
- }
- /* We can't give an error in the middle when using LOCAL files */
- if (read_file_from_client && handle_duplicates == DUP_ERROR)
- handle_duplicates=DUP_IGNORE;
- if (read_file_from_client && (thd->client_capabilities & CLIENT_LOCAL_FILES))
- {
- char tmp [FN_REFLEN+1],*end;
- DBUG_PRINT("info",("reading local file"));
- tmp[0] = (char) 251; /* NULL_LENGTH */
- end=strnmov(tmp+1,ex->file_name,sizeof(tmp)-2);
- (void) my_net_write(&thd->net,tmp,(uint) (end-tmp));
- (void) net_flush(&thd->net);
- file = -1;
- }
- else
- {
- read_file_from_client=0;
- #ifdef DONT_ALLOW_FULL_LOAD_DATA_PATHS
- ex->file_name+=dirname_length(ex->file_name);
- #endif
- if (!dirname_length(ex->file_name) &&
- strlen(ex->file_name)+strlen(mysql_data_home)+strlen(thd->db)+3 <
- FN_REFLEN)
- {
- (void) sprintf(name,"%s/%s/%s",mysql_data_home,thd->db,ex->file_name);
- unpack_filename(name,name); /* Convert to system format */
- }
- else
- {
- unpack_filename(name,ex->file_name);
- #ifndef __WIN__
- MY_STAT stat_info;
- if (!my_stat(name,&stat_info,MYF(MY_WME)))
- DBUG_RETURN(-1);
-
- // the file must be:
- if (!((stat_info.st_mode & S_IROTH) == S_IROTH && // readable by others
- #ifndef __EMX__
- (stat_info.st_mode & S_IFLNK) != S_IFLNK && // and not a symlink
- #endif
- ((stat_info.st_mode & S_IFREG) == S_IFREG ||
- (stat_info.st_mode & S_IFIFO) == S_IFIFO)))
- {
- my_error(ER_TEXTFILE_NOT_READABLE,MYF(0),name);
- DBUG_RETURN(-1);
- }
- if ((stat_info.st_mode & S_IFIFO) == S_IFIFO)
- is_fifo = 1;
- #endif
- }
- if ((file=my_open(name,O_RDONLY,MYF(MY_WME))) < 0)
- DBUG_RETURN(-1);
- }
- COPY_INFO info;
- bzero((char*) &info,sizeof(info));
- info.handle_duplicates=handle_duplicates;
- info.escape_char=escaped->length() ? (*escaped)[0] : INT_MAX;
- READ_INFO read_info(file,tot_length,*field_term,
- *ex->line_start, *ex->line_term, *enclosed,
- info.escape_char, read_file_from_client, is_fifo);
- if (read_info.error)
- {
- if (file >= 0)
- my_close(file,MYF(0)); // no files in net reading
- DBUG_RETURN(-1); // Can't allocate buffers
- }
- restore_record(table,2);
- thd->count_cuted_fields=1; /* calc cuted fields */
- thd->cuted_fields=0L;
- if (ex->line_term->length() && field_term->length())
- {
- while (ex->skip_lines--)
- {
- if (read_info.next_line())
- break;
- }
- }
- if (!(error=test(read_info.error)))
- {
- uint save_time_stamp=table->time_stamp;
- if (use_timestamp)
- table->time_stamp=0;
- table->next_number_field=table->found_next_number_field;
- VOID(table->file->extra(HA_EXTRA_WRITE_CACHE));
- if (handle_duplicates == DUP_IGNORE ||
- handle_duplicates == DUP_REPLACE)
- table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
- table->file->deactivate_non_unique_index((ha_rows) 0);
- table->copy_blobs=1;
- if (!field_term->length() && !enclosed->length())
- error=read_fixed_length(thd,info,table,fields,read_info);
- else
- error=read_sep_field(thd,info,table,fields,read_info,*enclosed);
- if (table->file->extra(HA_EXTRA_NO_CACHE) ||
- table->file->activate_all_index(thd))
- error=1; /* purecov: inspected */
- table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);
- table->time_stamp=save_time_stamp;
- table->next_number_field=0;
- if (thd->lock)
- {
- mysql_unlock_tables(thd, thd->lock);
- thd->lock=0;
- }
- }
- if (file >= 0) my_close(file,MYF(0));
- free_blobs(table); /* if pack_blob was used */
- table->copy_blobs=0;
- thd->count_cuted_fields=0; /* Don`t calc cuted fields */
- if (error)
- DBUG_RETURN(-1); // Error on read
- sprintf(name,ER(ER_LOAD_INFO),info.records,info.deleted,
- info.records-info.copied,thd->cuted_fields);
- send_ok(&thd->net,info.copied+info.deleted,0L,name);
- // on the slave thd->query is never initialized
- if(!thd->slave_thread)
- mysql_update_log.write(thd,thd->query,thd->query_length);
-
- if (!table->file->has_transactions())
- thd->options|=OPTION_STATUS_NO_TRANS_UPDATE;
- if (!read_file_from_client && mysql_bin_log.is_open())
- {
- ex->skip_lines = save_skip_lines;
- Load_log_event qinfo(thd, ex, table->table_name, fields,
- handle_duplicates);
- mysql_bin_log.write(&qinfo);
- }
- DBUG_RETURN(0);
- }
- /****************************************************************************
- ** Read of rows of fixed size + optional garage + optonal newline
- ****************************************************************************/
- static int
- read_fixed_length(THD *thd,COPY_INFO &info,TABLE *table,List<Item> &fields,
- READ_INFO &read_info)
- {
- List_iterator<Item> it(fields);
- Item_field *sql_field;
- DBUG_ENTER("read_fixed_length");
- /* No fields can be null in this format. mark all fields as not null */
- while ((sql_field= (Item_field*) it++))
- sql_field->field->set_notnull();
- while (!read_info.read_fixed_length())
- {
- if (thd->killed)
- {
- my_error(ER_SERVER_SHUTDOWN,MYF(0));
- DBUG_RETURN(1);
- }
- it.rewind();
- byte *pos=read_info.row_start;
- #ifdef HAVE_purify
- read_info.row_end[0]=0;
- #endif
- while ((sql_field= (Item_field*) it++))
- {
- Field *field=sql_field->field;
- if (pos == read_info.row_end)
- {
- thd->cuted_fields++; /* Not enough fields */
- field->reset();
- }
- else
- {
- uint length;
- byte save_chr;
- if ((length=(uint) (read_info.row_end-pos)) >
- field->field_length)
- length=field->field_length;
- save_chr=pos[length]; pos[length]=' '; // Safeguard aganst malloc
- field->store((char*) pos,length);
- 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->cuted_fields++; /* To long row */
- if (write_record(table,&info))
- DBUG_RETURN(1);
- if (table->next_number_field)
- table->next_number_field->reset(); // Clear for next record
- if (read_info.next_line()) // Skipp to next line
- break;
- if (read_info.line_cuted)
- thd->cuted_fields++; /* To long row */
- }
- DBUG_RETURN(test(read_info.error));
- }
- static int
- read_sep_field(THD *thd,COPY_INFO &info,TABLE *table,
- List<Item> &fields, READ_INFO &read_info,
- String &enclosed)
- {
- List_iterator<Item> it(fields);
- Item_field *sql_field;
- uint enclosed_length;
- DBUG_ENTER("read_sep_field");
- enclosed_length=enclosed.length();
- for (;;it.rewind())
- {
- if (thd->killed)
- {
- my_error(ER_SERVER_SHUTDOWN,MYF(0));
- DBUG_RETURN(1);
- }
- while ((sql_field=(Item_field*) it++))
- {
- uint length;
- byte *pos;
- if (read_info.read_field())
- break;
- pos=read_info.row_start;
- length=(uint) (read_info.row_end-pos);
- Field *field=sql_field->field;
- if (!read_info.enclosed &&
- (enclosed_length && length == 4 && !memcmp(pos,"NULL",4)) ||
- (length == 1 && read_info.found_null))
- {
- field->reset();
- field->set_null();
- if (!field->maybe_null())
- {
- if (field->type() == FIELD_TYPE_TIMESTAMP)
- ((Field_timestamp*) field)->set_time();
- else
- thd->cuted_fields++;
- }
- continue;
- }
- field->set_notnull();
- read_info.row_end[0]=0; // Safe to change end marker
- field->store((char*) read_info.row_start,length);
- }
- if (read_info.error)
- break;
- if (sql_field)
- { // Last record
- if (sql_field == (Item_field*) fields.head())
- break;
- for ( ; sql_field ; sql_field=(Item_field*) it++)
- {
- sql_field->field->set_null();
- sql_field->field->reset();
- thd->cuted_fields++;
- }
- }
- if (write_record(table,&info))
- DBUG_RETURN(1);
- if (table->next_number_field)
- table->next_number_field->reset(); // Clear for next record
- if (read_info.next_line()) // Skipp to next line
- break;
- if (read_info.line_cuted)
- thd->cuted_fields++; /* To long row */
- }
- DBUG_RETURN(test(read_info.error));
- }
- /* Unescape all escape characters, mark N as null */
- char
- READ_INFO::unescape(char chr)
- {
- switch(chr) {
- case 'n': return 'n';
- case 't': return 't';
- case 'r': return 'r';
- case 'b': return 'b';
- case '0': return 0; // Ascii null
- case 'Z': return ' 32'; // Win32 end of file
- case 'N': found_null=1;
- /* fall through */
- default: return chr;
- }
- }
- /* Read a line using buffering */
- /* If last line is empty (in line mode) then it isn't outputed */
- READ_INFO::READ_INFO(File file_par, uint tot_length, String &field_term,
- String &line_start, String &line_term,
- String &enclosed_par, int escape, bool get_it_from_net,
- bool is_fifo)
- :file(file_par),escape_char(escape)
- {
- field_term_ptr=(char*) field_term.ptr();
- field_term_length= field_term.length();
- line_term_ptr=(char*) line_term.ptr();
- line_term_length= line_term.length();
- if (line_start.length() == 0)
- {
- line_start_ptr=0;
- start_of_line= 0;
- }
- else
- {
- line_start_ptr=(char*) line_start.ptr();
- line_start_end=line_start_ptr+line_start.length();
- start_of_line= 1;
- }
- /* If field_terminator == line_terminator, don't use line_terminator */
- if (field_term_length == line_term_length &&
- !memcmp(field_term_ptr,line_term_ptr,field_term_length))
- {
- line_term_length=0;
- line_term_ptr=(char*) "";
- }
- enclosed_char= (enclosed_length=enclosed_par.length()) ?
- (uchar) enclosed_par[0] : INT_MAX;
- field_term_char= field_term_length ? (uchar) field_term_ptr[0] : INT_MAX;
- line_term_char= line_term_length ? (uchar) line_term_ptr[0] : INT_MAX;
- error=eof=found_end_of_line=found_null=line_cuted=0;
- buff_length=tot_length;
- /* Set of a stack for unget if long terminators */
- uint length=max(field_term_length,line_term_length)+1;
- set_if_bigger(length,line_start.length());
- stack=stack_pos=(int*) sql_alloc(sizeof(int)*length);
- if (!(buffer=(byte*) my_malloc(buff_length+1,MYF(0))))
- error=1; /* purecov: inspected */
- else
- {
- end_of_buff=buffer+buff_length;
- if (init_io_cache(&cache,(get_it_from_net) ? -1 : file, 0,
- (get_it_from_net) ? READ_NET :
- (is_fifo ? READ_FIFO : READ_CACHE),0L,1,
- MYF(MY_WME)))
- {
- my_free((gptr) buffer,MYF(0)); /* purecov: inspected */
- error=1;
- }
- }
- }
- READ_INFO::~READ_INFO()
- {
- if (!error)
- {
- end_io_cache(&cache);
- my_free((gptr) buffer,MYF(0));
- error=1;
- }
- }
- #define GET (stack_pos != stack ? *--stack_pos : my_b_get(&cache))
- #define PUSH(A) *(stack_pos++)=(A)
- inline int READ_INFO::terminator(char *ptr,uint length)
- {
- int chr=0; // Keep gcc happy
- uint i;
- for (i=1 ; i < length ; i++)
- {
- if ((chr=GET) != *++ptr)
- {
- break;
- }
- }
- if (i == length)
- return 1;
- PUSH(chr);
- while (i-- > 1)
- PUSH((uchar) *--ptr);
- return 0;
- }
- int READ_INFO::read_field()
- {
- int chr,found_enclosed_char;
- byte *to,*new_buffer;
- found_null=0;
- if (found_end_of_line)
- return 1; // One have to call next_line
- /* Skipp until we find 'line_start' */
- if (start_of_line)
- { // Skipp until line_start
- start_of_line=0;
- if (find_start_of_fields())
- return 1;
- }
- if ((chr=GET) == my_b_EOF)
- {
- found_end_of_line=eof=1;
- return 1;
- }
- to=buffer;
- if (chr == enclosed_char)
- {
- found_enclosed_char=enclosed_char;
- *to++=(byte) chr; // If error
- }
- else
- {
- found_enclosed_char= INT_MAX;
- PUSH(chr);
- }
- for (;;)
- {
- while ( to < end_of_buff)
- {
- chr = GET;
- #ifdef USE_MB
- if (use_mb(default_charset_info) &&
- my_ismbhead(default_charset_info, chr) &&
- to+my_mbcharlen(default_charset_info, chr) <= end_of_buff)
- {
- uchar* p = (uchar*)to;
- *to++ = chr;
- int ml = my_mbcharlen(default_charset_info, chr);
- int i;
- for (i=1; i<ml; i++) {
- chr = GET;
- if (chr == my_b_EOF)
- goto found_eof;
- *to++ = chr;
- }
- if (my_ismbchar(default_charset_info,
- (const char *)p,
- (const char *)to))
- continue;
- for (i=0; i<ml; i++)
- PUSH((uchar) *--to);
- chr = GET;
- }
- #endif
- if (chr == my_b_EOF)
- goto found_eof;
- if (chr == escape_char)
- {
- if ((chr=GET) == my_b_EOF)
- {
- *to++= (byte) escape_char;
- goto found_eof;
- }
- *to++ = (byte) unescape((char) chr);
- continue;
- }
- #ifdef ALLOW_LINESEPARATOR_IN_STRINGS
- if (chr == line_term_char)
- #else
- if (chr == line_term_char && found_enclosed_char == INT_MAX)
- #endif
- {
- if (terminator(line_term_ptr,line_term_length))
- { // Maybe unexpected linefeed
- enclosed=0;
- found_end_of_line=1;
- row_start=buffer;
- row_end= to;
- return 0;
- }
- }
- if (chr == found_enclosed_char)
- {
- if ((chr=GET) == found_enclosed_char)
- { // Remove dupplicated
- *to++ = (byte) chr;
- continue;
- }
- // End of enclosed field if followed by field_term or line_term
- if (chr == my_b_EOF ||
- chr == line_term_char && terminator(line_term_ptr,
- line_term_length))
- { // Maybe unexpected linefeed
- enclosed=1;
- found_end_of_line=1;
- row_start=buffer+1;
- row_end= to;
- return 0;
- }
- if (chr == field_term_char &&
- terminator(field_term_ptr,field_term_length))
- {
- enclosed=1;
- row_start=buffer+1;
- row_end= to;
- return 0;
- }
- /* Copy the found '"' character */
- PUSH(chr);
- chr='"';
- }
- else if (chr == field_term_char && found_enclosed_char == INT_MAX)
- {
- if (terminator(field_term_ptr,field_term_length))
- {
- enclosed=0;
- row_start=buffer;
- row_end= to;
- return 0;
- }
- }
- *to++ = (byte) chr;
- }
- /*
- ** We come here if buffer is too small. Enlarge it and continue
- */
- if (!(new_buffer=(byte*) my_realloc((char*) buffer,buff_length+1+IO_SIZE,
- MYF(MY_WME))))
- return (error=1);
- to=new_buffer + (to-buffer);
- buffer=new_buffer;
- buff_length+=IO_SIZE;
- end_of_buff=buffer+buff_length;
- }
- found_eof:
- enclosed=0;
- found_end_of_line=eof=1;
- row_start=buffer;
- row_end=to;
- return 0;
- }
- /*
- ** One can't use fixed length with multi-byte charset **
- */
-
- int READ_INFO::read_fixed_length()
- {
- int chr;
- byte *to;
- if (found_end_of_line)
- return 1; // One have to call next_line
- if (start_of_line)
- { // Skipp until line_start
- start_of_line=0;
- if (find_start_of_fields())
- return 1;
- }
- to=row_start=buffer;
- while (to < end_of_buff)
- {
- if ((chr=GET) == my_b_EOF)
- goto found_eof;
- if (chr == escape_char)
- {
- if ((chr=GET) == my_b_EOF)
- {
- *to++= (byte) escape_char;
- goto found_eof;
- }
- *to++ =(byte) unescape((char) chr);
- continue;
- }
- if (chr == line_term_char)
- {
- if (terminator(line_term_ptr,line_term_length))
- { // Maybe unexpected linefeed
- found_end_of_line=1;
- row_end= to;
- return 0;
- }
- }
- *to++ = (byte) chr;
- }
- row_end=to; // Found full line
- return 0;
- found_eof:
- found_end_of_line=eof=1;
- row_start=buffer;
- row_end=to;
- return to == buffer ? 1 : 0;
- }
- int READ_INFO::next_line()
- {
- line_cuted=0;
- start_of_line= line_start_ptr != 0;
- if (found_end_of_line || eof)
- {
- found_end_of_line=0;
- return eof;
- }
- found_end_of_line=0;
- if (!line_term_length)
- return 0; // No lines
- for (;;)
- {
- int chr = GET;
- #ifdef USE_MB
- if (use_mb(default_charset_info) && my_ismbhead(default_charset_info, chr))
- {
- for (int i=1;
- chr != my_b_EOF && i<my_mbcharlen(default_charset_info, chr);
- i++)
- chr = GET;
- if (chr == escape_char)
- continue;
- }
- #endif
- if (chr == my_b_EOF)
- {
- eof=1;
- return 1;
- }
- if (chr == escape_char)
- {
- line_cuted=1;
- if (GET == my_b_EOF)
- return 1;
- continue;
- }
- if (chr == line_term_char && terminator(line_term_ptr,line_term_length))
- return 0;
- line_cuted=1;
- }
- }
- bool READ_INFO::find_start_of_fields()
- {
- int chr;
- try_again:
- do
- {
- if ((chr=GET) == my_b_EOF)
- {
- found_end_of_line=eof=1;
- return 1;
- }
- } while ((char) chr != line_start_ptr[0]);
- for (char *ptr=line_start_ptr+1 ; ptr != line_start_end ; ptr++)
- {
- chr=GET; // Eof will be checked later
- if ((char) chr != *ptr)
- { // Can't be line_start
- PUSH(chr);
- while (--ptr != line_start_ptr)
- { // Restart with next char
- PUSH((uchar) *ptr);
- }
- goto try_again;
- }
- }
- return 0;
- }