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Overview
Comment:Experimental changes that allow a WITHOUT ROWID virtual table to be writable as long as it has only a single-column PRIMARY KEY.
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SHA3-256: ab9ee4c1e64c09c7130e385a23d043d78bad95dff5509c7adc9b992350a4a537
User & Date: drh 2017-08-10 15:19:39
Context
2017-08-10
17:53
Test case for writing to a WITHOUT ROWID virtual table. The TCLVAR virtual table is modified to add a "fullname" column which is the primary key, and to accept update operations against the primary key. (check-in: 6997e00c user: drh tags: writable-vtab-without-rowid)
15:19
Experimental changes that allow a WITHOUT ROWID virtual table to be writable as long as it has only a single-column PRIMARY KEY. (check-in: ab9ee4c1 user: drh tags: writable-vtab-without-rowid)
03:27
Add a first draft of the "vtablog" extensions that implements a generic virtual table useful for experimentation using the command-line shell. (check-in: e49279e6 user: drh tags: trunk)
Changes
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Changes to src/delete.c. 

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      if( !IsVirtual(pTab) && aToOpen[iDataCur-iTabCur] ){
        assert( pPk!=0 || pTab->pSelect!=0 );
        sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, addrBypass, iKey, nKey);
        VdbeCoverage(v);
      }
    }else if( pPk ){
      addrLoop = sqlite3VdbeAddOp1(v, OP_Rewind, iEphCur); VdbeCoverage(v);



      sqlite3VdbeAddOp2(v, OP_RowData, iEphCur, iKey);

      assert( nKey==0 );  /* OP_Found will use a composite key */
    }else{
      addrLoop = sqlite3VdbeAddOp3(v, OP_RowSetRead, iRowSet, 0, iKey);
      VdbeCoverage(v);
      assert( nKey==1 );
    }  
  








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      if( !IsVirtual(pTab) && aToOpen[iDataCur-iTabCur] ){
        assert( pPk!=0 || pTab->pSelect!=0 );
        sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, addrBypass, iKey, nKey);
        VdbeCoverage(v);
      }
    }else if( pPk ){
      addrLoop = sqlite3VdbeAddOp1(v, OP_Rewind, iEphCur); VdbeCoverage(v);
      if( IsVirtual(pTab) ){
        sqlite3VdbeAddOp3(v, OP_Column, iEphCur, 0, iKey);
      }else{
        sqlite3VdbeAddOp2(v, OP_RowData, iEphCur, iKey);
      }
      assert( nKey==0 );  /* OP_Found will use a composite key */
    }else{
      addrLoop = sqlite3VdbeAddOp3(v, OP_RowSetRead, iRowSet, 0, iKey);
      VdbeCoverage(v);
      assert( nKey==1 );
    }

Changes to src/update.c. 

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  regRowid = ++pParse->nMem;

  /* Start scanning the virtual table */
  pWInfo = sqlite3WhereBegin(pParse, pSrc, pWhere, 0,0,WHERE_ONEPASS_DESIRED,0);
  if( pWInfo==0 ) return;

  /* Populate the argument registers. */
  sqlite3VdbeAddOp2(v, OP_Rowid, iCsr, regArg);
  if( pRowid ){
    sqlite3ExprCode(pParse, pRowid, regArg+1);
  }else{
    sqlite3VdbeAddOp2(v, OP_Rowid, iCsr, regArg+1);
  }
  for(i=0; i<pTab->nCol; i++){
    if( aXRef[i]>=0 ){
      sqlite3ExprCode(pParse, pChanges->a[aXRef[i]].pExpr, regArg+2+i);
    }else{
      sqlite3VdbeAddOp3(v, OP_VColumn, iCsr, i, regArg+2+i);
    }
  }


















  bOnePass = sqlite3WhereOkOnePass(pWInfo, aDummy);

  if( bOnePass ){
    /* If using the onepass strategy, no-op out the OP_OpenEphemeral coded
    ** above. Also, if this is a top-level parse (not a trigger), clear the
    ** multi-write flag so that the VM does not open a statement journal */








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  regRowid = ++pParse->nMem;

  /* Start scanning the virtual table */
  pWInfo = sqlite3WhereBegin(pParse, pSrc, pWhere, 0,0,WHERE_ONEPASS_DESIRED,0);
  if( pWInfo==0 ) return;

  /* Populate the argument registers. */






  for(i=0; i<pTab->nCol; i++){
    if( aXRef[i]>=0 ){
      sqlite3ExprCode(pParse, pChanges->a[aXRef[i]].pExpr, regArg+2+i);
    }else{
      sqlite3VdbeAddOp3(v, OP_VColumn, iCsr, i, regArg+2+i);
    }
  }
  if( HasRowid(pTab) ){
    sqlite3VdbeAddOp2(v, OP_Rowid, iCsr, regArg);
    if( pRowid ){
      sqlite3ExprCode(pParse, pRowid, regArg+1);
    }else{
      sqlite3VdbeAddOp2(v, OP_Rowid, iCsr, regArg+1);
    }
  }else{
    Index *pPk;   /* PRIMARY KEY index */
    i16 iPk;      /* PRIMARY KEY column */
    pPk = sqlite3PrimaryKeyIndex(pTab);
    assert( pPk!=0 );
    assert( pPk->nKeyCol==1 );
    iPk = pPk->aiColumn[0];
    sqlite3VdbeAddOp3(v, OP_VColumn, iCsr, iPk, regArg);
    sqlite3VdbeAddOp2(v, OP_SCopy, regArg+2+iPk, regArg+1);
  }

  bOnePass = sqlite3WhereOkOnePass(pWInfo, aDummy);

  if( bOnePass ){
    /* If using the onepass strategy, no-op out the OP_OpenEphemeral coded
    ** above. Also, if this is a top-level parse (not a trigger), clear the
    ** multi-write flag so that the VM does not open a statement journal */

Changes to src/vtab.c. 

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      Index *pIdx;
      pTab->aCol = pNew->aCol;
      pTab->nCol = pNew->nCol;
      pTab->tabFlags |= pNew->tabFlags & (TF_WithoutRowid|TF_NoVisibleRowid);
      pNew->nCol = 0;
      pNew->aCol = 0;
      assert( pTab->pIndex==0 );


      if( !HasRowid(pNew) && pCtx->pVTable->pMod->pModule->xUpdate!=0 ){




        rc = SQLITE_ERROR;
      }
      pIdx = pNew->pIndex;
      if( pIdx ){
        assert( pIdx->pNext==0 );
        pTab->pIndex = pIdx;
        pNew->pIndex = 0;








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      Index *pIdx;
      pTab->aCol = pNew->aCol;
      pTab->nCol = pNew->nCol;
      pTab->tabFlags |= pNew->tabFlags & (TF_WithoutRowid|TF_NoVisibleRowid);
      pNew->nCol = 0;
      pNew->aCol = 0;
      assert( pTab->pIndex==0 );
      assert( HasRowid(pNew) || sqlite3PrimaryKeyIndex(pNew)!=0 );
      if( !HasRowid(pNew)
       && pCtx->pVTable->pMod->pModule->xUpdate!=0
       && sqlite3PrimaryKeyIndex(pNew)->nKeyCol!=1
      ){
        /* WITHOUT ROWID virtual tables must either be read-only (xUpdate==0)
        ** or else must have a single-column PRIMARY KEY */
        rc = SQLITE_ERROR;
      }
      pIdx = pNew->pIndex;
      if( pIdx ){
        assert( pIdx->pNext==0 );
        pTab->pIndex = pIdx;
        pNew->pIndex = 0;

Changes to test/csv01.test. 

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} {5 9}

# The rowid column is not visible on a WITHOUT ROWID virtual table
do_catchsql_test 3.2 {
  SELECT rowid, a FROM t3;
} {1 {no such column: rowid}}


do_catchsql_test 4.0 {
  DROP TABLE t3;
  CREATE VIRTUAL TABLE temp.t4 USING csv_wr(
    data=
'1,2,3,4
5,6,7,8
9,10,11,12
13,14,15,16
',
    columns=4,
    schema=
      'CREATE TABLE t3(a PRIMARY KEY,b TEXT,c TEXT,d TEXT) WITHOUT ROWID',

    testflags=1
  );
} {1 {vtable constructor failed: t4}}

















finish_test








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} {5 9}

# The rowid column is not visible on a WITHOUT ROWID virtual table
do_catchsql_test 3.2 {
  SELECT rowid, a FROM t3;
} {1 {no such column: rowid}}

# Multi-column WITHOUT ROWID virtual tables may not be writable.
do_catchsql_test 4.0 {
  DROP TABLE t3;
  CREATE VIRTUAL TABLE temp.t4 USING csv_wr(
    data=
'1,2,3,4
5,6,7,8
9,10,11,12
13,14,15,16',

    columns=4,
    schema=

      'CREATE TABLE t3(a,b,c,d,PRIMARY KEY(a,b)) WITHOUT ROWID',
    testflags=1
  );
} {1 {vtable constructor failed: t4}}

# WITHOUT ROWID tables with a single-column PRIMARY KEY may be writable.
do_catchsql_test 4.1 {
  DROP TABLE IF EXISTS t4;
  CREATE VIRTUAL TABLE temp.t4 USING csv_wr(
    data=
'1,2,3,4
5,6,7,8
9,10,11,12
13,14,15,16',
    columns=4,
    schema=
      'CREATE TABLE t3(a,b,c,d,PRIMARY KEY(b)) WITHOUT ROWID',
    testflags=1
  );
} {0 {}}

finish_test

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