SQLite

Check-in [a9b6a0672f]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Minor simplification to the OP_AutoCommit opcode. Fix some code comments related to transaction control.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: a9b6a0672f84dd205f9333951e4c2a608d027d71
User & Date: drh 2016-02-01 13:21:13.072
Context
2016-02-01
13:58
Fix a problem causing the OR/covering-index optimization to be disabled if compile time parameter SQLITE_MAX_ATTACHED were set to greater than 30. (check-in: a17712bf8d user: dan tags: trunk)
13:21
Minor simplification to the OP_AutoCommit opcode. Fix some code comments related to transaction control. (check-in: a9b6a0672f user: drh tags: trunk)
00:21
Fix an assert() that might fail on a corrupt database. (check-in: 22eaced727 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/build.c.
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
      p->a[i].fg.jointype = p->a[i-1].fg.jointype;
    }
    p->a[0].fg.jointype = 0;
  }
}

/*
** Begin a transaction
*/
void sqlite3BeginTransaction(Parse *pParse, int type){
  sqlite3 *db;
  Vdbe *v;
  int i;

  assert( pParse!=0 );
  db = pParse->db;
  assert( db!=0 );
/*  if( db->aDb[0].pBt==0 ) return; */
  if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "BEGIN", 0, 0) ){
    return;
  }
  v = sqlite3GetVdbe(pParse);
  if( !v ) return;
  if( type!=TK_DEFERRED ){
    for(i=0; i<db->nDb; i++){
      sqlite3VdbeAddOp2(v, OP_Transaction, i, (type==TK_EXCLUSIVE)+1);
      sqlite3VdbeUsesBtree(v, i);
    }
  }
  sqlite3VdbeAddOp2(v, OP_AutoCommit, 0, 0);
}

/*
** Commit a transaction
*/
void sqlite3CommitTransaction(Parse *pParse){
  Vdbe *v;

  assert( pParse!=0 );
  assert( pParse->db!=0 );
  if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "COMMIT", 0, 0) ){
    return;
  }
  v = sqlite3GetVdbe(pParse);
  if( v ){
    sqlite3VdbeAddOp2(v, OP_AutoCommit, 1, 0);
  }
}

/*
** Rollback a transaction
*/
void sqlite3RollbackTransaction(Parse *pParse){
  Vdbe *v;

  assert( pParse!=0 );
  assert( pParse->db!=0 );
  if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "ROLLBACK", 0, 0) ){







|









<











|



|











|




|







3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904

3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
      p->a[i].fg.jointype = p->a[i-1].fg.jointype;
    }
    p->a[0].fg.jointype = 0;
  }
}

/*
** Generate VDBE code for a BEGIN statement.
*/
void sqlite3BeginTransaction(Parse *pParse, int type){
  sqlite3 *db;
  Vdbe *v;
  int i;

  assert( pParse!=0 );
  db = pParse->db;
  assert( db!=0 );

  if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "BEGIN", 0, 0) ){
    return;
  }
  v = sqlite3GetVdbe(pParse);
  if( !v ) return;
  if( type!=TK_DEFERRED ){
    for(i=0; i<db->nDb; i++){
      sqlite3VdbeAddOp2(v, OP_Transaction, i, (type==TK_EXCLUSIVE)+1);
      sqlite3VdbeUsesBtree(v, i);
    }
  }
  sqlite3VdbeAddOp0(v, OP_AutoCommit);
}

/*
** Generate VDBE code for a COMMIT statement.
*/
void sqlite3CommitTransaction(Parse *pParse){
  Vdbe *v;

  assert( pParse!=0 );
  assert( pParse->db!=0 );
  if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "COMMIT", 0, 0) ){
    return;
  }
  v = sqlite3GetVdbe(pParse);
  if( v ){
    sqlite3VdbeAddOp1(v, OP_AutoCommit, 1);
  }
}

/*
** Generate VDBE code for a ROLLBACK statement.
*/
void sqlite3RollbackTransaction(Parse *pParse){
  Vdbe *v;

  assert( pParse!=0 );
  assert( pParse->db!=0 );
  if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "ROLLBACK", 0, 0) ){
Changes to src/vdbe.c.
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032








3033
3034
3035
3036
3037
3038
3039
** there are active writing VMs or active VMs that use shared cache.
**
** This instruction causes the VM to halt.
*/
case OP_AutoCommit: {
  int desiredAutoCommit;
  int iRollback;
  int turnOnAC;

  desiredAutoCommit = pOp->p1;
  iRollback = pOp->p2;
  turnOnAC = desiredAutoCommit && !db->autoCommit;
  assert( desiredAutoCommit==1 || desiredAutoCommit==0 );
  assert( desiredAutoCommit==1 || iRollback==0 );
  assert( db->nVdbeActive>0 );  /* At least this one VM is active */
  assert( p->bIsReader );

  if( turnOnAC && !iRollback && db->nVdbeWrite>0 ){
    /* If this instruction implements a COMMIT and other VMs are writing
    ** return an error indicating that the other VMs must complete first. 
    */
    sqlite3VdbeError(p, "cannot commit transaction - "
                        "SQL statements in progress");
    rc = SQLITE_BUSY;
  }else if( desiredAutoCommit!=db->autoCommit ){
    if( iRollback ){
      assert( desiredAutoCommit==1 );
      sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
      db->autoCommit = 1;








    }else if( (rc = sqlite3VdbeCheckFk(p, 1))!=SQLITE_OK ){
      goto vdbe_return;
    }else{
      db->autoCommit = (u8)desiredAutoCommit;
    }
    if( sqlite3VdbeHalt(p)==SQLITE_BUSY ){
      p->pc = (int)(pOp - aOp);







<



<





<
<
<
<
<
<
<
|




>
>
>
>
>
>
>
>







3004
3005
3006
3007
3008
3009
3010

3011
3012
3013

3014
3015
3016
3017
3018







3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
** there are active writing VMs or active VMs that use shared cache.
**
** This instruction causes the VM to halt.
*/
case OP_AutoCommit: {
  int desiredAutoCommit;
  int iRollback;


  desiredAutoCommit = pOp->p1;
  iRollback = pOp->p2;

  assert( desiredAutoCommit==1 || desiredAutoCommit==0 );
  assert( desiredAutoCommit==1 || iRollback==0 );
  assert( db->nVdbeActive>0 );  /* At least this one VM is active */
  assert( p->bIsReader );








  if( desiredAutoCommit!=db->autoCommit ){
    if( iRollback ){
      assert( desiredAutoCommit==1 );
      sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
      db->autoCommit = 1;
    }else if( desiredAutoCommit && db->nVdbeWrite>0 ){
      /* If this instruction implements a COMMIT and other VMs are writing
      ** return an error indicating that the other VMs must complete first. 
      */
      sqlite3VdbeError(p, "cannot commit transaction - "
                          "SQL statements in progress");
      rc = SQLITE_BUSY;
      break;
    }else if( (rc = sqlite3VdbeCheckFk(p, 1))!=SQLITE_OK ){
      goto vdbe_return;
    }else{
      db->autoCommit = (u8)desiredAutoCommit;
    }
    if( sqlite3VdbeHalt(p)==SQLITE_BUSY ){
      p->pc = (int)(pOp - aOp);
Changes to src/vdbeaux.c.
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
  Parse *pParse = p->pParse;
  int *aLabel = pParse->aLabel;
  p->readOnly = 1;
  p->bIsReader = 0;
  for(pOp=p->aOp, i=p->nOp-1; i>=0; i--, pOp++){
    u8 opcode = pOp->opcode;

    /* NOTE: Be sure to update mkopcodeh.awk when adding or removing
    ** cases from this switch! */
    switch( opcode ){
      case OP_Transaction: {
        if( pOp->p2!=0 ) p->readOnly = 0;
        /* fall thru */
      }
      case OP_AutoCommit:







|







530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
  Parse *pParse = p->pParse;
  int *aLabel = pParse->aLabel;
  p->readOnly = 1;
  p->bIsReader = 0;
  for(pOp=p->aOp, i=p->nOp-1; i>=0; i--, pOp++){
    u8 opcode = pOp->opcode;

    /* NOTE: Be sure to update mkopcodeh.tcl when adding or removing
    ** cases from this switch! */
    switch( opcode ){
      case OP_Transaction: {
        if( pOp->p2!=0 ) p->readOnly = 0;
        /* fall thru */
      }
      case OP_AutoCommit: