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Improved comments. Fewer opcodes for integrity_check on strict tables.

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FossilOrigin-Name: 4ee57fb588b41ab76649c605f57c7bcf5b7b638435af458d69f69a8ccbb121e8
This commit is contained in:
drh
2021-08-19 16:29:33 +00:00
parent 9e1209d111
commit 71c770fbda
7 changed files with 104 additions and 50 deletions
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44
src/insert.c
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@@ -110,24 +110,44 @@ const char *sqlite3IndexAffinityStr(sqlite3 *db, Index *pIdx){
}
/*
** Make changes to the evolving bytecode to do affinity transformations
** of values that are about to be gathered into a row for table pTab.
**
** For ordinary (legacy, non-strict) tables:
** -----------------------------------------
**
** Compute the affinity string for table pTab, if it has not already been
** computed. As an optimization, omit trailing SQLITE_AFF_BLOB affinities.
**
** If the affinity exists (if it is not entirely SQLITE_AFF_BLOB values) and
** if iReg>0 then code an OP_Affinity opcode that will set the affinities
** for register iReg and following. Or if affinities exists and iReg==0,
** If the affinity string is empty (because it was all SQLITE_AFF_BLOB entries
** which were then optimized out) then this routine becomes a no-op.
**
** Otherwise if iReg>0 then code an OP_Affinity opcode that will set the
** affinities for register iReg and following. Or if iReg==0,
** then just set the P4 operand of the previous opcode (which should be
** an OP_MakeRecord) to the affinity string.
**
** A column affinity string has one character per column:
**
** Character Column affinity
** ------------------------------
** 'A' BLOB
** 'B' TEXT
** 'C' NUMERIC
** 'D' INTEGER
** 'E' REAL
** Character Column affinity
** --------- ---------------
** 'A' BLOB
** 'B' TEXT
** 'C' NUMERIC
** 'D' INTEGER
** 'E' REAL
**
** For STRICT tables:
** ------------------
**
** Generate an appropropriate OP_TypeCheck opcode that will verify the
** datatypes against the column definitions in pTab. If iReg==0, that
** means an OP_MakeRecord opcode has already been generated and should be
** the last opcode generated. The new OP_TypeCheck needs to be inserted
** before the OP_MakeRecord. The new OP_TypeCheck should use the same
** register set as the OP_MakeRecord. If iReg>0 then register iReg is
** the first of a series of registers that will form the new record.
** Apply the type checking to that array of registers.
*/
void sqlite3TableAffinity(Vdbe *v, Table *pTab, int iReg){
int i, j;
@@ -140,6 +160,8 @@ void sqlite3TableAffinity(Vdbe *v, Table *pTab, int iReg){
VdbeOp *pPrev;
sqlite3VdbeAppendP4(v, pTab, P4_TABLE);
pPrev = sqlite3VdbeGetOp(v, -1);
assert( pPrev!=0 );
assert( pPrev->opcode==OP_MakeRecord || sqlite3VdbeDb(v)->mallocFailed );
pPrev->opcode = OP_TypeCheck;
sqlite3VdbeAddOp3(v, OP_MakeRecord, pPrev->p1, pPrev->p2, pPrev->p3);
}else{
@@ -175,6 +197,8 @@ void sqlite3TableAffinity(Vdbe *v, Table *pTab, int iReg){
if( iReg ){
sqlite3VdbeAddOp4(v, OP_Affinity, iReg, i, 0, zColAff, i);
}else{
assert( sqlite3VdbeGetOp(v, -1)->opcode==OP_MakeRecord
|| sqlite3VdbeDb(v)->mallocFailed );
sqlite3VdbeChangeP4(v, -1, zColAff, i);
}
}