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2018 lines (1920 loc) · 74.7 KB
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/*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle INSERT statements in SQLite.
*/
#include "sqliteInt.h"
/*
** Generate code that will
**
** (1) acquire a lock for table pTab then
** (2) open pTab as cursor iCur.
**
** If pTab is a WITHOUT ROWID table, then it is the PRIMARY KEY index
** for that table that is actually opened.
*/
void sqlite3OpenTable(
Parse *pParse, /* Generate code into this VDBE */
int iCur, /* The cursor number of the table */
int iDb, /* The database index in sqlite3.aDb[] */
Table *pTab, /* The table to be opened */
int opcode /* OP_OpenRead or OP_OpenWrite */
){
Vdbe *v;
assert( !IsVirtual(pTab) );
v = sqlite3GetVdbe(pParse);
assert( opcode==OP_OpenWrite || opcode==OP_OpenRead );
sqlite3TableLock(pParse, iDb, pTab->tnum,
(opcode==OP_OpenWrite)?1:0, pTab->zName);
if( HasRowid(pTab) ){
sqlite3VdbeAddOp4Int(v, opcode, iCur, pTab->tnum, iDb, pTab->nCol);
VdbeComment((v, "%s", pTab->zName));
}else{
Index *pPk = sqlite3PrimaryKeyIndex(pTab);
assert( pPk!=0 );
assert( pPk->tnum=pTab->tnum );
sqlite3VdbeAddOp3(v, opcode, iCur, pPk->tnum, iDb);
sqlite3VdbeSetP4KeyInfo(pParse, pPk);
VdbeComment((v, "%s", pTab->zName));
}
}
/*
** Return a pointer to the column affinity string associated with index
** pIdx. A column affinity string has one character for each column in
** the table, according to the affinity of the column:
**
** Character Column affinity
** ------------------------------
** 'a' TEXT
** 'b' NONE
** 'c' NUMERIC
** 'd' INTEGER
** 'e' REAL
**
** An extra 'd' is appended to the end of the string to cover the
** rowid that appears as the last column in every index.
**
** Memory for the buffer containing the column index affinity string
** is managed along with the rest of the Index structure. It will be
** released when sqlite3DeleteIndex() is called.
*/
const char *sqlite3IndexAffinityStr(Vdbe *v, Index *pIdx){
if( !pIdx->zColAff ){
/* The first time a column affinity string for a particular index is
** required, it is allocated and populated here. It is then stored as
** a member of the Index structure for subsequent use.
**
** The column affinity string will eventually be deleted by
** sqliteDeleteIndex() when the Index structure itself is cleaned
** up.
*/
int n;
Table *pTab = pIdx->pTable;
sqlite3 *db = sqlite3VdbeDb(v);
pIdx->zColAff = (char *)sqlite3DbMallocRaw(0, pIdx->nColumn+1);
if( !pIdx->zColAff ){
db->mallocFailed = 1;
return 0;
}
for(n=0; n<pIdx->nColumn; n++){
i16 x = pIdx->aiColumn[n];
pIdx->zColAff[n] = x<0 ? SQLITE_AFF_INTEGER : pTab->aCol[x].affinity;
}
pIdx->zColAff[n] = 0;
}
return pIdx->zColAff;
}
/*
** Compute the affinity string for table pTab, if it has not already been
** computed. As an optimization, omit trailing SQLITE_AFF_NONE affinities.
**
** If the affinity exists (if it is no entirely SQLITE_AFF_NONE 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,
** 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' TEXT
** 'b' NONE
** 'c' NUMERIC
** 'd' INTEGER
** 'e' REAL
*/
void sqlite3TableAffinity(Vdbe *v, Table *pTab, int iReg){
int i;
char *zColAff = pTab->zColAff;
if( zColAff==0 ){
sqlite3 *db = sqlite3VdbeDb(v);
zColAff = (char *)sqlite3DbMallocRaw(0, pTab->nCol+1);
if( !zColAff ){
db->mallocFailed = 1;
return;
}
for(i=0; i<pTab->nCol; i++){
zColAff[i] = pTab->aCol[i].affinity;
}
do{
zColAff[i--] = 0;
}while( i>=0 && zColAff[i]==SQLITE_AFF_NONE );
pTab->zColAff = zColAff;
}
i = sqlite3Strlen30(zColAff);
if( i ){
if( iReg ){
sqlite3VdbeAddOp4(v, OP_Affinity, iReg, i, 0, zColAff, i);
}else{
sqlite3VdbeChangeP4(v, -1, zColAff, i);
}
}
}
/*
** Return non-zero if the table pTab in database iDb or any of its indices
** have been opened at any point in the VDBE program. This is used to see if
** a statement of the form "INSERT INTO <iDb, pTab> SELECT ..." can
** run without using a temporary table for the results of the SELECT.
*/
static int readsTable(Parse *p, int iDb, Table *pTab){
Vdbe *v = sqlite3GetVdbe(p);
int i;
int iEnd = sqlite3VdbeCurrentAddr(v);
#ifndef SQLITE_OMIT_VIRTUALTABLE
VTable *pVTab = IsVirtual(pTab) ? sqlite3GetVTable(p->db, pTab) : 0;
#endif
for(i=1; i<iEnd; i++){
VdbeOp *pOp = sqlite3VdbeGetOp(v, i);
assert( pOp!=0 );
if( pOp->opcode==OP_OpenRead && pOp->p3==iDb ){
Index *pIndex;
int tnum = pOp->p2;
if( tnum==pTab->tnum ){
return 1;
}
for(pIndex=pTab->pIndex; pIndex; pIndex=pIndex->pNext){
if( tnum==pIndex->tnum ){
return 1;
}
}
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( pOp->opcode==OP_VOpen && pOp->p4.pVtab==pVTab ){
assert( pOp->p4.pVtab!=0 );
assert( pOp->p4type==P4_VTAB );
return 1;
}
#endif
}
return 0;
}
#ifndef SQLITE_OMIT_AUTOINCREMENT
/*
** Locate or create an AutoincInfo structure associated with table pTab
** which is in database iDb. Return the register number for the register
** that holds the maximum rowid.
**
** There is at most one AutoincInfo structure per table even if the
** same table is autoincremented multiple times due to inserts within
** triggers. A new AutoincInfo structure is created if this is the
** first use of table pTab. On 2nd and subsequent uses, the original
** AutoincInfo structure is used.
**
** Three memory locations are allocated:
**
** (1) Register to hold the name of the pTab table.
** (2) Register to hold the maximum ROWID of pTab.
** (3) Register to hold the rowid in sqlite_sequence of pTab
**
** The 2nd register is the one that is returned. That is all the
** insert routine needs to know about.
*/
static int autoIncBegin(
Parse *pParse, /* Parsing context */
int iDb, /* Index of the database holding pTab */
Table *pTab /* The table we are writing to */
){
int memId = 0; /* Register holding maximum rowid */
if( pTab->tabFlags & TF_Autoincrement ){
Parse *pToplevel = sqlite3ParseToplevel(pParse);
AutoincInfo *pInfo;
pInfo = pToplevel->pAinc;
while( pInfo && pInfo->pTab!=pTab ){ pInfo = pInfo->pNext; }
if( pInfo==0 ){
pInfo = sqlite3DbMallocRaw(pParse->db, sizeof(*pInfo));
if( pInfo==0 ) return 0;
pInfo->pNext = pToplevel->pAinc;
pToplevel->pAinc = pInfo;
pInfo->pTab = pTab;
pInfo->iDb = iDb;
pToplevel->nMem++; /* Register to hold name of table */
pInfo->regCtr = ++pToplevel->nMem; /* Max rowid register */
pToplevel->nMem++; /* Rowid in sqlite_sequence */
}
memId = pInfo->regCtr;
}
return memId;
}
/*
** This routine generates code that will initialize all of the
** register used by the autoincrement tracker.
*/
void sqlite3AutoincrementBegin(Parse *pParse){
AutoincInfo *p; /* Information about an AUTOINCREMENT */
sqlite3 *db = pParse->db; /* The database connection */
Db *pDb; /* Database only autoinc table */
int memId; /* Register holding max rowid */
int addr; /* A VDBE address */
Vdbe *v = pParse->pVdbe; /* VDBE under construction */
/* This routine is never called during trigger-generation. It is
** only called from the top-level */
assert( pParse->pTriggerTab==0 );
assert( pParse==sqlite3ParseToplevel(pParse) );
assert( v ); /* We failed long ago if this is not so */
for(p = pParse->pAinc; p; p = p->pNext){
pDb = &db->aDb[p->iDb];
memId = p->regCtr;
assert( sqlite3SchemaMutexHeld(db, 0, pDb->pSchema) );
sqlite3OpenTable(pParse, 0, p->iDb, pDb->pSchema->pSeqTab, OP_OpenRead);
sqlite3VdbeAddOp3(v, OP_Null, 0, memId, memId+1);
addr = sqlite3VdbeCurrentAddr(v);
sqlite3VdbeAddOp4(v, OP_String8, 0, memId-1, 0, p->pTab->zName, 0);
sqlite3VdbeAddOp2(v, OP_Rewind, 0, addr+9); VdbeCoverage(v);
sqlite3VdbeAddOp3(v, OP_Column, 0, 0, memId);
sqlite3VdbeAddOp3(v, OP_Ne, memId-1, addr+7, memId); VdbeCoverage(v);
sqlite3VdbeChangeP5(v, SQLITE_JUMPIFNULL);
sqlite3VdbeAddOp2(v, OP_Rowid, 0, memId+1);
sqlite3VdbeAddOp3(v, OP_Column, 0, 1, memId);
sqlite3VdbeAddOp2(v, OP_Goto, 0, addr+9);
sqlite3VdbeAddOp2(v, OP_Next, 0, addr+2); VdbeCoverage(v);
sqlite3VdbeAddOp2(v, OP_Integer, 0, memId);
sqlite3VdbeAddOp0(v, OP_Close);
}
}
/*
** Update the maximum rowid for an autoincrement calculation.
**
** This routine should be called when the top of the stack holds a
** new rowid that is about to be inserted. If that new rowid is
** larger than the maximum rowid in the memId memory cell, then the
** memory cell is updated. The stack is unchanged.
*/
static void autoIncStep(Parse *pParse, int memId, int regRowid){
if( memId>0 ){
sqlite3VdbeAddOp2(pParse->pVdbe, OP_MemMax, memId, regRowid);
}
}
/*
** This routine generates the code needed to write autoincrement
** maximum rowid values back into the sqlite_sequence register.
** Every statement that might do an INSERT into an autoincrement
** table (either directly or through triggers) needs to call this
** routine just before the "exit" code.
*/
void sqlite3AutoincrementEnd(Parse *pParse){
AutoincInfo *p;
Vdbe *v = pParse->pVdbe;
sqlite3 *db = pParse->db;
assert( v );
for(p = pParse->pAinc; p; p = p->pNext){
Db *pDb = &db->aDb[p->iDb];
int j1;
int iRec;
int memId = p->regCtr;
iRec = sqlite3GetTempReg(pParse);
assert( sqlite3SchemaMutexHeld(db, 0, pDb->pSchema) );
sqlite3OpenTable(pParse, 0, p->iDb, pDb->pSchema->pSeqTab, OP_OpenWrite);
j1 = sqlite3VdbeAddOp1(v, OP_NotNull, memId+1); VdbeCoverage(v);
sqlite3VdbeAddOp2(v, OP_NewRowid, 0, memId+1);
sqlite3VdbeJumpHere(v, j1);
sqlite3VdbeAddOp3(v, OP_MakeRecord, memId-1, 2, iRec);
sqlite3VdbeAddOp3(v, OP_Insert, 0, iRec, memId+1);
sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
sqlite3VdbeAddOp0(v, OP_Close);
sqlite3ReleaseTempReg(pParse, iRec);
}
}
#else
/*
** If SQLITE_OMIT_AUTOINCREMENT is defined, then the three routines
** above are all no-ops
*/
# define autoIncBegin(A,B,C) (0)
# define autoIncStep(A,B,C)
#endif /* SQLITE_OMIT_AUTOINCREMENT */
/* Forward declaration */
static int xferOptimization(
Parse *pParse, /* Parser context */
Table *pDest, /* The table we are inserting into */
Select *pSelect, /* A SELECT statement to use as the data source */
int onError, /* How to handle constraint errors */
int iDbDest /* The database of pDest */
);
/*
** This routine is called to handle SQL of the following forms:
**
** insert into TABLE (IDLIST) values(EXPRLIST)
** insert into TABLE (IDLIST) select
**
** The IDLIST following the table name is always optional. If omitted,
** then a list of all columns for the table is substituted. The IDLIST
** appears in the pColumn parameter. pColumn is NULL if IDLIST is omitted.
**
** The pList parameter holds EXPRLIST in the first form of the INSERT
** statement above, and pSelect is NULL. For the second form, pList is
** NULL and pSelect is a pointer to the select statement used to generate
** data for the insert.
**
** The code generated follows one of four templates. For a simple
** insert with data coming from a VALUES clause, the code executes
** once straight down through. Pseudo-code follows (we call this
** the "1st template"):
**
** open write cursor to <table> and its indices
** put VALUES clause expressions into registers
** write the resulting record into <table>
** cleanup
**
** The three remaining templates assume the statement is of the form
**
** INSERT INTO <table> SELECT ...
**
** If the SELECT clause is of the restricted form "SELECT * FROM <table2>" -
** in other words if the SELECT pulls all columns from a single table
** and there is no WHERE or LIMIT or GROUP BY or ORDER BY clauses, and
** if <table2> and <table1> are distinct tables but have identical
** schemas, including all the same indices, then a special optimization
** is invoked that copies raw records from <table2> over to <table1>.
** See the xferOptimization() function for the implementation of this
** template. This is the 2nd template.
**
** open a write cursor to <table>
** open read cursor on <table2>
** transfer all records in <table2> over to <table>
** close cursors
** foreach index on <table>
** open a write cursor on the <table> index
** open a read cursor on the corresponding <table2> index
** transfer all records from the read to the write cursors
** close cursors
** end foreach
**
** The 3rd template is for when the second template does not apply
** and the SELECT clause does not read from <table> at any time.
** The generated code follows this template:
**
** X <- A
** goto B
** A: setup for the SELECT
** loop over the rows in the SELECT
** load values into registers R..R+n
** yield X
** end loop
** cleanup after the SELECT
** end-coroutine X
** B: open write cursor to <table> and its indices
** C: yield X, at EOF goto D
** insert the select result into <table> from R..R+n
** goto C
** D: cleanup
**
** The 4th template is used if the insert statement takes its
** values from a SELECT but the data is being inserted into a table
** that is also read as part of the SELECT. In the third form,
** we have to use a intermediate table to store the results of
** the select. The template is like this:
**
** X <- A
** goto B
** A: setup for the SELECT
** loop over the tables in the SELECT
** load value into register R..R+n
** yield X
** end loop
** cleanup after the SELECT
** end co-routine R
** B: open temp table
** L: yield X, at EOF goto M
** insert row from R..R+n into temp table
** goto L
** M: open write cursor to <table> and its indices
** rewind temp table
** C: loop over rows of intermediate table
** transfer values form intermediate table into <table>
** end loop
** D: cleanup
*/
void sqlite3Insert(
Parse *pParse, /* Parser context */
SrcList *pTabList, /* Name of table into which we are inserting */
Select *pSelect, /* A SELECT statement to use as the data source */
IdList *pColumn, /* Column names corresponding to IDLIST. */
int onError /* How to handle constraint errors */
){
sqlite3 *db; /* The main database structure */
Table *pTab; /* The table to insert into. aka TABLE */
char *zTab; /* Name of the table into which we are inserting */
const char *zDb; /* Name of the database holding this table */
int i, j, idx; /* Loop counters */
Vdbe *v; /* Generate code into this virtual machine */
Index *pIdx; /* For looping over indices of the table */
int nColumn; /* Number of columns in the data */
int nHidden = 0; /* Number of hidden columns if TABLE is virtual */
int iDataCur = 0; /* VDBE cursor that is the main data repository */
int iIdxCur = 0; /* First index cursor */
int ipkColumn = -1; /* Column that is the INTEGER PRIMARY KEY */
int endOfLoop; /* Label for the end of the insertion loop */
int srcTab = 0; /* Data comes from this temporary cursor if >=0 */
int addrInsTop = 0; /* Jump to label "D" */
int addrCont = 0; /* Top of insert loop. Label "C" in templates 3 and 4 */
SelectDest dest; /* Destination for SELECT on rhs of INSERT */
int iDb; /* Index of database holding TABLE */
Db *pDb; /* The database containing table being inserted into */
u8 useTempTable = 0; /* Store SELECT results in intermediate table */
u8 appendFlag = 0; /* True if the insert is likely to be an append */
u8 withoutRowid; /* 0 for normal table. 1 for WITHOUT ROWID table */
u8 bIdListInOrder = 1; /* True if IDLIST is in table order */
ExprList *pList = 0; /* List of VALUES() to be inserted */
/* Register allocations */
int regFromSelect = 0;/* Base register for data coming from SELECT */
int regAutoinc = 0; /* Register holding the AUTOINCREMENT counter */
int regRowCount = 0; /* Memory cell used for the row counter */
int regIns; /* Block of regs holding rowid+data being inserted */
int regRowid; /* registers holding insert rowid */
int regData; /* register holding first column to insert */
int *aRegIdx = 0; /* One register allocated to each index */
#ifndef SQLITE_OMIT_TRIGGER
int isView; /* True if attempting to insert into a view */
Trigger *pTrigger; /* List of triggers on pTab, if required */
int tmask; /* Mask of trigger times */
#endif
db = pParse->db;
memset(&dest, 0, sizeof(dest));
if( pParse->nErr || db->mallocFailed ){
goto insert_cleanup;
}
/* If the Select object is really just a simple VALUES() list with a
** single row values (the common case) then keep that one row of values
** and go ahead and discard the Select object
*/
if( pSelect && (pSelect->selFlags & SF_Values)!=0 && pSelect->pPrior==0 ){
pList = pSelect->pEList;
pSelect->pEList = 0;
sqlite3SelectDelete(db, pSelect);
pSelect = 0;
}
/* Locate the table into which we will be inserting new information.
*/
assert( pTabList->nSrc==1 );
zTab = pTabList->a[0].zName;
if( NEVER(zTab==0) ) goto insert_cleanup;
pTab = sqlite3SrcListLookup(pParse, pTabList);
if( pTab==0 ){
goto insert_cleanup;
}
iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
assert( iDb<db->nDb );
pDb = &db->aDb[iDb];
zDb = pDb->zName;
if( sqlite3AuthCheck(pParse, SQLITE_INSERT, pTab->zName, 0, zDb) ){
goto insert_cleanup;
}
withoutRowid = !HasRowid(pTab);
/* Figure out if we have any triggers and if the table being
** inserted into is a view
*/
#ifndef SQLITE_OMIT_TRIGGER
pTrigger = sqlite3TriggersExist(pParse, pTab, TK_INSERT, 0, &tmask);
isView = pTab->pSelect!=0;
#else
# define pTrigger 0
# define tmask 0
# define isView 0
#endif
#ifdef SQLITE_OMIT_VIEW
# undef isView
# define isView 0
#endif
assert( (pTrigger && tmask) || (pTrigger==0 && tmask==0) );
/* If pTab is really a view, make sure it has been initialized.
** ViewGetColumnNames() is a no-op if pTab is not a view.
*/
if( sqlite3ViewGetColumnNames(pParse, pTab) ){
goto insert_cleanup;
}
/* Cannot insert into a read-only table.
*/
if( sqlite3IsReadOnly(pParse, pTab, tmask) ){
goto insert_cleanup;
}
/* Allocate a VDBE
*/
v = sqlite3GetVdbe(pParse);
if( v==0 ) goto insert_cleanup;
if( pParse->nested==0 ) sqlite3VdbeCountChanges(v);
sqlite3BeginWriteOperation(pParse, pSelect || pTrigger, iDb);
#ifndef SQLITE_OMIT_XFER_OPT
/* If the statement is of the form
**
** INSERT INTO <table1> SELECT * FROM <table2>;
**
** Then special optimizations can be applied that make the transfer
** very fast and which reduce fragmentation of indices.
**
** This is the 2nd template.
*/
if( pColumn==0 && xferOptimization(pParse, pTab, pSelect, onError, iDb) ){
assert( !pTrigger );
assert( pList==0 );
goto insert_end;
}
#endif /* SQLITE_OMIT_XFER_OPT */
/* If this is an AUTOINCREMENT table, look up the sequence number in the
** sqlite_sequence table and store it in memory cell regAutoinc.
*/
regAutoinc = autoIncBegin(pParse, iDb, pTab);
/* Allocate registers for holding the rowid of the new row,
** the content of the new row, and the assemblied row record.
*/
regRowid = regIns = pParse->nMem+1;
pParse->nMem += pTab->nCol + 1;
if( IsVirtual(pTab) ){
regRowid++;
pParse->nMem++;
}
regData = regRowid+1;
/* If the INSERT statement included an IDLIST term, then make sure
** all elements of the IDLIST really are columns of the table and
** remember the column indices.
**
** If the table has an INTEGER PRIMARY KEY column and that column
** is named in the IDLIST, then record in the ipkColumn variable
** the index into IDLIST of the primary key column. ipkColumn is
** the index of the primary key as it appears in IDLIST, not as
** is appears in the original table. (The index of the INTEGER
** PRIMARY KEY in the original table is pTab->iPKey.)
*/
if( pColumn ){
for(i=0; i<pColumn->nId; i++){
pColumn->a[i].idx = -1;
}
for(i=0; i<pColumn->nId; i++){
for(j=0; j<pTab->nCol; j++){
if( sqlite3StrICmp(pColumn->a[i].zName, pTab->aCol[j].zName)==0 ){
pColumn->a[i].idx = j;
if( i!=j ) bIdListInOrder = 0;
if( j==pTab->iPKey ){
ipkColumn = i; assert( !withoutRowid );
}
break;
}
}
if( j>=pTab->nCol ){
if( sqlite3IsRowid(pColumn->a[i].zName) && !withoutRowid ){
ipkColumn = i;
bIdListInOrder = 0;
}else{
sqlite3ErrorMsg(pParse, "table %S has no column named %s",
pTabList, 0, pColumn->a[i].zName);
pParse->checkSchema = 1;
goto insert_cleanup;
}
}
}
}
/* Figure out how many columns of data are supplied. If the data
** is coming from a SELECT statement, then generate a co-routine that
** produces a single row of the SELECT on each invocation. The
** co-routine is the common header to the 3rd and 4th templates.
*/
if( pSelect ){
/* Data is coming from a SELECT. Generate a co-routine to run the SELECT */
int regYield; /* Register holding co-routine entry-point */
int addrTop; /* Top of the co-routine */
int rc; /* Result code */
regYield = ++pParse->nMem;
addrTop = sqlite3VdbeCurrentAddr(v) + 1;
sqlite3VdbeAddOp3(v, OP_InitCoroutine, regYield, 0, addrTop);
sqlite3SelectDestInit(&dest, SRT_Coroutine, regYield);
dest.iSdst = bIdListInOrder ? regData : 0;
dest.nSdst = pTab->nCol;
rc = sqlite3Select(pParse, pSelect, &dest);
regFromSelect = dest.iSdst;
assert( pParse->nErr==0 || rc );
if( rc || db->mallocFailed ) goto insert_cleanup;
sqlite3VdbeAddOp1(v, OP_EndCoroutine, regYield);
sqlite3VdbeJumpHere(v, addrTop - 1); /* label B: */
assert( pSelect->pEList );
nColumn = pSelect->pEList->nExpr;
/* Set useTempTable to TRUE if the result of the SELECT statement
** should be written into a temporary table (template 4). Set to
** FALSE if each output row of the SELECT can be written directly into
** the destination table (template 3).
**
** A temp table must be used if the table being updated is also one
** of the tables being read by the SELECT statement. Also use a
** temp table in the case of row triggers.
*/
if( pTrigger || readsTable(pParse, iDb, pTab) ){
useTempTable = 1;
}
if( useTempTable ){
/* Invoke the coroutine to extract information from the SELECT
** and add it to a transient table srcTab. The code generated
** here is from the 4th template:
**
** B: open temp table
** L: yield X, goto M at EOF
** insert row from R..R+n into temp table
** goto L
** M: ...
*/
int regRec; /* Register to hold packed record */
int regTempRowid; /* Register to hold temp table ROWID */
int addrL; /* Label "L" */
srcTab = pParse->nTab++;
regRec = sqlite3GetTempReg(pParse);
regTempRowid = sqlite3GetTempReg(pParse);
sqlite3VdbeAddOp2(v, OP_OpenEphemeral, srcTab, nColumn);
addrL = sqlite3VdbeAddOp1(v, OP_Yield, dest.iSDParm); VdbeCoverage(v);
sqlite3VdbeAddOp3(v, OP_MakeRecord, regFromSelect, nColumn, regRec);
sqlite3VdbeAddOp2(v, OP_NewRowid, srcTab, regTempRowid);
sqlite3VdbeAddOp3(v, OP_Insert, srcTab, regRec, regTempRowid);
sqlite3VdbeAddOp2(v, OP_Goto, 0, addrL);
sqlite3VdbeJumpHere(v, addrL);
sqlite3ReleaseTempReg(pParse, regRec);
sqlite3ReleaseTempReg(pParse, regTempRowid);
}
}else{
/* This is the case if the data for the INSERT is coming from a VALUES
** clause
*/
NameContext sNC;
memset(&sNC, 0, sizeof(sNC));
sNC.pParse = pParse;
srcTab = -1;
assert( useTempTable==0 );
nColumn = pList ? pList->nExpr : 0;
for(i=0; i<nColumn; i++){
if( sqlite3ResolveExprNames(&sNC, pList->a[i].pExpr) ){
goto insert_cleanup;
}
}
}
/* If there is no IDLIST term but the table has an integer primary
** key, the set the ipkColumn variable to the integer primary key
** column index in the original table definition.
*/
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.
*/
if( IsVirtual(pTab) ){
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;
}
if( pColumn!=0 && nColumn!=pColumn->nId ){
sqlite3ErrorMsg(pParse, "%d values for %d columns", nColumn, pColumn->nId);
goto insert_cleanup;
}
/* Initialize the count of rows to be inserted
*/
if( db->flags & SQLITE_CountRows ){
regRowCount = ++pParse->nMem;
sqlite3VdbeAddOp2(v, OP_Integer, 0, regRowCount);
}
/* If this is not a view, open the table and and all indices */
if( !isView ){
int nIdx;
nIdx = sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, -1, 0,
&iDataCur, &iIdxCur);
aRegIdx = sqlite3DbMallocRaw(db, sizeof(int)*(nIdx+1));
if( aRegIdx==0 ){
goto insert_cleanup;
}
for(i=0; i<nIdx; i++){
aRegIdx[i] = ++pParse->nMem;
}
}
/* This is the top of the main insertion loop */
if( useTempTable ){
/* This block codes the top of loop only. The complete loop is the
** following pseudocode (template 4):
**
** rewind temp table, if empty goto D
** C: loop over rows of intermediate table
** transfer values form intermediate table into <table>
** end loop
** D: ...
*/
addrInsTop = sqlite3VdbeAddOp1(v, OP_Rewind, srcTab); VdbeCoverage(v);
addrCont = sqlite3VdbeCurrentAddr(v);
}else if( pSelect ){
/* This block codes the top of loop only. The complete loop is the
** following pseudocode (template 3):
**
** C: yield X, at EOF goto D
** insert the select result into <table> from R..R+n
** goto C
** D: ...
*/
addrInsTop = addrCont = sqlite3VdbeAddOp1(v, OP_Yield, dest.iSDParm);
VdbeCoverage(v);
}
/* Run the BEFORE and INSTEAD OF triggers, if there are any
*/
endOfLoop = sqlite3VdbeMakeLabel(v);
if( tmask & TRIGGER_BEFORE ){
int regCols = sqlite3GetTempRange(pParse, pTab->nCol+1);
/* build the NEW.* reference row. Note that if there is an INTEGER
** PRIMARY KEY into which a NULL is being inserted, that NULL will be
** translated into a unique ID for the row. But on a BEFORE trigger,
** we do not know what the unique ID will be (because the insert has
** not happened yet) so we substitute a rowid of -1
*/
if( ipkColumn<0 ){
sqlite3VdbeAddOp2(v, OP_Integer, -1, regCols);
}else{
int j1;
assert( !withoutRowid );
if( useTempTable ){
sqlite3VdbeAddOp3(v, OP_Column, srcTab, ipkColumn, regCols);
}else{
assert( pSelect==0 ); /* Otherwise useTempTable is true */
sqlite3ExprCode(pParse, pList->a[ipkColumn].pExpr, regCols);
}
j1 = sqlite3VdbeAddOp1(v, OP_NotNull, regCols); VdbeCoverage(v);
sqlite3VdbeAddOp2(v, OP_Integer, -1, regCols);
sqlite3VdbeJumpHere(v, j1);
sqlite3VdbeAddOp1(v, OP_MustBeInt, regCols); VdbeCoverage(v);
}
/* Cannot have triggers on a virtual table. If it were possible,
** this block would have to account for hidden column.
*/
assert( !IsVirtual(pTab) );
/* Create the new column data
*/
for(i=0; i<pTab->nCol; i++){
if( pColumn==0 ){
j = i;
}else{
for(j=0; j<pColumn->nId; j++){
if( pColumn->a[j].idx==i ) break;
}
}
if( (!useTempTable && !pList) || (pColumn && j>=pColumn->nId) ){
sqlite3ExprCode(pParse, pTab->aCol[i].pDflt, regCols+i+1);
}else if( useTempTable ){
sqlite3VdbeAddOp3(v, OP_Column, srcTab, j, regCols+i+1);
}else{
assert( pSelect==0 ); /* Otherwise useTempTable is true */
sqlite3ExprCodeAndCache(pParse, pList->a[j].pExpr, regCols+i+1);
}
}
/* If this is an INSERT on a view with an INSTEAD OF INSERT trigger,
** do not attempt any conversions before assembling the record.
** If this is a real table, attempt conversions as required by the
** table column affinities.
*/
if( !isView ){
sqlite3TableAffinity(v, pTab, regCols+1);
}
/* Fire BEFORE or INSTEAD OF triggers */
sqlite3CodeRowTrigger(pParse, pTrigger, TK_INSERT, 0, TRIGGER_BEFORE,
pTab, regCols-pTab->nCol-1, onError, endOfLoop);
sqlite3ReleaseTempRange(pParse, regCols, pTab->nCol+1);
}
/* Compute the content of the next row to insert into a range of
** registers beginning at regIns.
*/
if( !isView ){
if( IsVirtual(pTab) ){
/* The row that the VUpdate opcode will delete: none */
sqlite3VdbeAddOp2(v, OP_Null, 0, regIns);
}
if( ipkColumn>=0 ){
if( useTempTable ){
sqlite3VdbeAddOp3(v, OP_Column, srcTab, ipkColumn, regRowid);
}else if( pSelect ){
sqlite3VdbeAddOp2(v, OP_Copy, regFromSelect+ipkColumn, regRowid);
}else{
VdbeOp *pOp;
sqlite3ExprCode(pParse, pList->a[ipkColumn].pExpr, regRowid);
pOp = sqlite3VdbeGetOp(v, -1);
if( ALWAYS(pOp) && pOp->opcode==OP_Null && !IsVirtual(pTab) ){
appendFlag = 1;
pOp->opcode = OP_NewRowid;
pOp->p1 = iDataCur;
pOp->p2 = regRowid;
pOp->p3 = regAutoinc;
}
}
/* If the PRIMARY KEY expression is NULL, then use OP_NewRowid
** to generate a unique primary key value.
*/
if( !appendFlag ){
int j1;
if( !IsVirtual(pTab) ){
j1 = sqlite3VdbeAddOp1(v, OP_NotNull, regRowid); VdbeCoverage(v);
sqlite3VdbeAddOp3(v, OP_NewRowid, iDataCur, regRowid, regAutoinc);
sqlite3VdbeJumpHere(v, j1);
}else{
j1 = sqlite3VdbeCurrentAddr(v);
sqlite3VdbeAddOp2(v, OP_IsNull, regRowid, j1+2); VdbeCoverage(v);
}
sqlite3VdbeAddOp1(v, OP_MustBeInt, regRowid); VdbeCoverage(v);
}
}else if( IsVirtual(pTab) || withoutRowid ){
sqlite3VdbeAddOp2(v, OP_Null, 0, regRowid);
}else{
sqlite3VdbeAddOp3(v, OP_NewRowid, iDataCur, regRowid, regAutoinc);
appendFlag = 1;
}
autoIncStep(pParse, regAutoinc, regRowid);
/* Compute data for all columns of the new entry, beginning
** with the first column.
*/
nHidden = 0;
for(i=0; i<pTab->nCol; i++){
int iRegStore = regRowid+1+i;
if( i==pTab->iPKey ){
/* The value of the INTEGER PRIMARY KEY column is always a NULL.
** Whenever this column is read, the rowid will be substituted
** in its place. Hence, fill this column with a NULL to avoid
** 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) );
j = -1;
nHidden++;
}else{
j = i - nHidden;
}
}else{
for(j=0; j<pColumn->nId; j++){
if( pColumn->a[j].idx==i ) break;
}
}
if( j<0 || nColumn==0 || (pColumn && j>=pColumn->nId) ){
sqlite3ExprCodeFactorable(pParse, pTab->aCol[i].pDflt, iRegStore);
}else if( useTempTable ){
sqlite3VdbeAddOp3(v, OP_Column, srcTab, j, iRegStore);
}else if( pSelect ){
if( regFromSelect!=regData ){
sqlite3VdbeAddOp2(v, OP_SCopy, regFromSelect+j, iRegStore);
}
}else{
sqlite3ExprCode(pParse, pList->a[j].pExpr, iRegStore);
}
}
/* Generate code to check constraints and generate index keys and
** do the insertion.
*/
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( IsVirtual(pTab) ){
const char *pVTab = (const char *)sqlite3GetVTable(db, pTab);
sqlite3VtabMakeWritable(pParse, pTab);
sqlite3VdbeAddOp4(v, OP_VUpdate, 1, pTab->nCol+2, regIns, pVTab, P4_VTAB);
sqlite3VdbeChangeP5(v, onError==OE_Default ? OE_Abort : onError);
sqlite3MayAbort(pParse);
}else
#endif
{
int isReplace; /* Set to true if constraints may cause a replace */
sqlite3GenerateConstraintChecks(pParse, pTab, aRegIdx, iDataCur, iIdxCur,
regIns, 0, ipkColumn>=0, onError, endOfLoop, &isReplace
);
sqlite3FkCheck(pParse, pTab, 0, regIns, 0, 0);
sqlite3CompleteInsertion(pParse, pTab, iDataCur, iIdxCur,
regIns, aRegIdx, 0, appendFlag, isReplace==0);
}
}
/* Update the count of rows that are inserted
*/
if( (db->flags & SQLITE_CountRows)!=0 ){
sqlite3VdbeAddOp2(v, OP_AddImm, regRowCount, 1);
}
if( pTrigger ){
/* Code AFTER triggers */
sqlite3CodeRowTrigger(pParse, pTrigger, TK_INSERT, 0, TRIGGER_AFTER,
pTab, regData-2-pTab->nCol, onError, endOfLoop);
}
/* The bottom of the main insertion loop, if the data source
** is a SELECT statement.
*/
sqlite3VdbeResolveLabel(v, endOfLoop);
if( useTempTable ){
sqlite3VdbeAddOp2(v, OP_Next, srcTab, addrCont); VdbeCoverage(v);
sqlite3VdbeJumpHere(v, addrInsTop);
sqlite3VdbeAddOp1(v, OP_Close, srcTab);
}else if( pSelect ){
sqlite3VdbeAddOp2(v, OP_Goto, 0, addrCont);
sqlite3VdbeJumpHere(v, addrInsTop);
}
if( !IsVirtual(pTab) && !isView ){
/* Close all tables opened */
if( iDataCur<iIdxCur ) sqlite3VdbeAddOp1(v, OP_Close, iDataCur);
for(idx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){
sqlite3VdbeAddOp1(v, OP_Close, idx+iIdxCur);
}
}