Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
Comment: | If a table column name begins with "__hidden__" then do not include that column in "*" expansions in SELECT statements, nor fill in that column in an INSERT INTO that omits the column list. This branch is a proof-of-concept only and is not intended to ever be merged into trunk. |
---|---|
Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | hidden-columns-in-tables |
Files: | files | file ages | folders |
SHA1: |
2dbffb3a3b20dba7d7d86c8ad2e34633 |
User & Date: | drh 2015-11-18 18:43:15.107 |
Original Comment: | If a table column name begins with "__hidden__" then do not include that column in "*" expansions in SELECT statements, nor fill in that column in an INSERT INTO that omits the column list. This branch is a proof-of-concept only and is not intended to ever be merged into trunk. |
Context
2015-11-18
| ||
20:07 | Add a test for the __hidden__ hack on this branch. (check-in: ebf4bbffec user: dan tags: hidden-columns-in-tables) | |
18:43 | If a table column name begins with "__hidden__" then do not include that column in "*" expansions in SELECT statements, nor fill in that column in an INSERT INTO that omits the column list. This branch is a proof-of-concept only and is not intended to ever be merged into trunk. (check-in: 2dbffb3a3b user: drh tags: hidden-columns-in-tables) | |
2015-11-17
| ||
21:42 | When using mmap mode on Win32, use a read-only mapping by default. Write to the database file using WriteFile(). Unless SQLITE_MMAP_READWRITE is defined, in which case use a read/write mapping and write into the file using memcpy(). (check-in: 4f521b5bb3 user: mistachkin tags: trunk) | |
Changes
Changes to src/build.c.
︙ | ︙ | |||
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 | return; } p->aCol = aNew; } pCol = &p->aCol[p->nCol]; memset(pCol, 0, sizeof(p->aCol[0])); pCol->zName = z; /* If there is no type specified, columns have the default affinity ** 'BLOB'. If there is a type specified, then sqlite3AddColumnType() will ** be called next to set pCol->affinity correctly. */ pCol->affinity = SQLITE_AFF_BLOB; pCol->szEst = 1; | > > > | 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 | return; } p->aCol = aNew; } pCol = &p->aCol[p->nCol]; memset(pCol, 0, sizeof(p->aCol[0])); pCol->zName = z; if( sqlite3_strnicmp(z, "__hidden__", 10)==0 ){ pCol->colFlags |= COLFLAG_HIDDEN; } /* If there is no type specified, columns have the default affinity ** 'BLOB'. If there is a type specified, then sqlite3AddColumnType() will ** be called next to set pCol->affinity correctly. */ pCol->affinity = SQLITE_AFF_BLOB; pCol->szEst = 1; |
︙ | ︙ |
Changes to src/insert.c.
︙ | ︙ | |||
732 733 734 735 736 737 738 | if( pColumn==0 && nColumn>0 ){ ipkColumn = pTab->iPKey; } /* Make sure the number of columns in the source data matches the number ** of columns to be inserted into the table. */ | < | | < | 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 | if( pColumn==0 && nColumn>0 ){ ipkColumn = pTab->iPKey; } /* Make sure the number of columns in the source data matches the number ** of columns to be inserted into the table. */ for(i=0; i<pTab->nCol; i++){ nHidden += (IsHiddenColumn(&pTab->aCol[i]) ? 1 : 0); } if( pColumn==0 && nColumn && nColumn!=(pTab->nCol-nHidden) ){ sqlite3ErrorMsg(pParse, "table %S has %d columns but %d values were supplied", pTabList, 0, pTab->nCol-nHidden, nColumn); goto insert_cleanup; } |
︙ | ︙ | |||
930 931 932 933 934 935 936 | ** taking up data space with information that will never be used. ** As there may be shallow copies of this value, make it a soft-NULL */ sqlite3VdbeAddOp1(v, OP_SoftNull, iRegStore); continue; } if( pColumn==0 ){ if( IsHiddenColumn(&pTab->aCol[i]) ){ | | > | 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 | ** taking up data space with information that will never be used. ** As there may be shallow copies of this value, make it a soft-NULL */ sqlite3VdbeAddOp1(v, OP_SoftNull, iRegStore); continue; } if( pColumn==0 ){ if( IsHiddenColumn(&pTab->aCol[i]) ){ assert( IsVirtual(pTab) || sqlite3_strnicmp(pTab->aCol[i].zName,"__hidden__",10)==0 ); j = -1; nHidden++; }else{ j = i - nHidden; } }else{ for(j=0; j<pColumn->nId; j++){ |
︙ | ︙ |
Changes to src/select.c.
︙ | ︙ | |||
4361 4362 4363 4364 4365 4366 4367 | } /* If a column is marked as 'hidden' (currently only possible ** for virtual tables), do not include it in the expanded ** result-set list. */ if( IsHiddenColumn(&pTab->aCol[j]) ){ | | > | 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 | } /* If a column is marked as 'hidden' (currently only possible ** for virtual tables), do not include it in the expanded ** result-set list. */ if( IsHiddenColumn(&pTab->aCol[j]) ){ assert( IsVirtual(pTab) || sqlite3_strnicmp(pTab->aCol[j].zName,"__hidden__", 10)==0 ); continue; } tableSeen = 1; if( i>0 && zTName==0 ){ if( (pFrom->fg.jointype & JT_NATURAL)!=0 && tableAndColumnIndex(pTabList, i, zName, 0, 0) |
︙ | ︙ |