SQLite

      /* pkChng!=0 does not mean that the rowid has changed, only that
      ** it might have changed.  Skip the conflict logic below if the rowid
      ** is unchanged. */
      sqlite3VdbeAddOp3(v, OP_Eq, regNewData, addrRowidOk, regOldData);
      sqlite3VdbeChangeP5(v, SQLITE_NOTNULL);
      VdbeCoverage(v);
    }

    /* figure out whether or not upsert applies in this case */
    if( pUpsert && (pUpsert->pUpsertTarget==0 || pUpsert->pUpsertIdx==0) ){
      if( pUpsert->pUpsertSet==0 ){
        onError = OE_Ignore;  /* DO NOTHING is the same as INSERT OR IGNORE */
      }else{
        onError = OE_Update;  /* DO UPDATE */
      }
    }

    /* If the response to a rowid conflict is REPLACE but the response
    ** to some other UNIQUE constraint is FAIL or IGNORE, then we need
    ** to defer the running of the rowid conflict checking until after
    ** the UNIQUE constraints have run.
    */
    if( onError==OE_Replace && overrideError!=OE_Replace ){
      for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
        if( pIdx->onError==OE_Ignore || pIdx->onError==OE_Fail ){
          ipkTop = sqlite3VdbeAddOp0(v, OP_Goto);
          break;
        }
      }
    }

    /* Check to see if the new rowid already exists in the table.  Skip
    ** the following conflict logic if it does not. */
    sqlite3VdbeAddOp3(v, OP_NotExists, iDataCur, addrRowidOk, regNewData);
    VdbeCoverage(v);


    switch( onError ){
      default: {
        onError = OE_Abort;
        /* Fall thru into the next case */
      }
      case OE_Rollback:
      case OE_Abort:

            sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur,0,-1);
          }
        }
        seenReplace = 1;
        break;
      }
      case OE_Ignore: {

        sqlite3VdbeGoto(v, ignoreDest);
        break;
      }
    }
    sqlite3VdbeResolveLabel(v, addrRowidOk);
    if( ipkTop ){
      ipkBottom = sqlite3VdbeAddOp0(v, OP_Goto);

      continue;  /* pIdx is not a UNIQUE index */
    }
    if( overrideError!=OE_Default ){
      onError = overrideError;
    }else if( onError==OE_Default ){
      onError = OE_Abort;
    }

    /* Figure out if the upsert clause applies to this index */
    if( pUpsert && (pUpsert->pUpsertTarget==0 || pUpsert->pUpsertIdx==pIdx) ){
      if( pUpsert->pUpsertSet==0 ){
        onError = OE_Ignore;  /* DO NOTHING is the same as INSERT OR IGNORE */
      }else{
        onError = OE_Update;  /* DO UPDATE */
      }
    }

    /* Collision detection may be omitted if all of the following are true:
    **   (1) The conflict resolution algorithm is REPLACE
    **   (2) The table is a WITHOUT ROWID table
    **   (3) There are no secondary indexes on the table
    **   (4) No delete triggers need to be fired if there is a conflict
    **   (5) No FK constraint counters need to be updated if a conflict occurs.

*/
#define OE_None     0   /* There is no constraint to check */
#define OE_Rollback 1   /* Fail the operation and rollback the transaction */
#define OE_Abort    2   /* Back out changes but do no rollback transaction */
#define OE_Fail     3   /* Stop the operation but leave all prior changes */
#define OE_Ignore   4   /* Ignore the error. Do not do the INSERT or UPDATE */
#define OE_Replace  5   /* Delete existing record, then do INSERT or UPDATE */
#define OE_Update   6   /* Process as a DO UPDATE in an upsert */
#define OE_Restrict 7   /* OE_Abort for IMMEDIATE, OE_Rollback for DEFERRED */
#define OE_SetNull  8   /* Set the foreign key value to NULL */
#define OE_SetDflt  9   /* Set the foreign key value to its default */
#define OE_Cascade  10  /* Cascade the changes */

#define OE_Default  11  /* Do whatever the default action is */


/*
** An instance of the following structure is passed as the first
** argument to sqlite3VdbeKeyCompare and is used to control the
** comparison of the two index keys.
**

source $testdir/tester.tcl
set testprefix zipfile

do_execsql_test upsert1-100 {
  CREATE TABLE t1(a INTEGER PRIMARY KEY, b TEXT, c DEFAULT 0);
  CREATE UNIQUE INDEX t1x1 ON t1(b);
  INSERT INTO t1(a,b) VALUES(1,2) ON CONFLICT DO NOTHING;
  INSERT INTO t1(a,b) VALUES(1,99),(99,2) ON CONFLICT DO NOTHING;
  SELECT * FROM t1;
} {1 2 0}
do_execsql_test upsert1-101 {
  DELETE FROM t1;
  INSERT INTO t1(a,b) VALUES(2,3) ON CONFLICT(a) DO NOTHING;
  INSERT INTO t1(a,b) VALUES(2,99) ON CONFLICT(a) DO NOTHING;
  SELECT * FROM t1;
} {2 3 0}
do_execsql_test upsert1-102 {
  DELETE FROM t1;
  INSERT INTO t1(a,b) VALUES(3,4) ON CONFLICT(b) DO NOTHING;
  INSERT INTO t1(a,b) VALUES(99,4) ON CONFLICT(b) DO NOTHING;
  SELECT * FROM t1;
} {3 4 0}
do_catchsql_test upsert1-110 {
  INSERT INTO t1(a,b) VALUES(5,6) ON CONFLICT(x) DO NOTHING;
  SELECT * FROM t1;
} {1 {no such column: x}}
do_catchsql_test upsert1-120 {

do_execsql_test upsert1-140 {
  DELETE FROM t1;
  INSERT INTO t1(a,b) VALUES(5,6) ON CONFLICT(b COLLATE binary) DO NOTHING;
  SELECT * FROM t1;
} {5 6 0}

do_catchsql_test upsert1-200 {
  DROP TABLE t1;
  CREATE TABLE t1(a INTEGER PRIMARY KEY, b INT, c DEFAULT 0);
  CREATE UNIQUE INDEX t1x1 ON t1(a+b);
  INSERT INTO t1(a,b) VALUES(7,8) ON CONFLICT(a+b) DO NOTHING;
  INSERT INTO t1(a,b) VALUES(8,7),(9,6) ON CONFLICT(a+b) DO NOTHING;
  SELECT * FROM t1;
} {0 {7 8 0}}
do_catchsql_test upsert1-201 {
  INSERT INTO t1(a,b) VALUES(8,7),(9,6) ON CONFLICT(a) DO NOTHING;
} {1 {UNIQUE constraint failed: index 't1x1'}}
do_catchsql_test upsert1-210 {
  DELETE FROM t1;
  INSERT INTO t1(a,b) VALUES(9,10) ON CONFLICT(a+(+b)) DO NOTHING;
  SELECT * FROM t1;
} {1 {ON CONFLICT clause does not match any PRIMARY KEY or UNIQUE constraint}}

do_catchsql_test upsert1-300 {
  DROP INDEX t1x1;
  DELETE FROM t1;
  CREATE UNIQUE INDEX t1x1 ON t1(b) WHERE b>10;
  INSERT INTO t1(a,b) VALUES(1,2),(3,2) ON CONFLICT(b) DO NOTHING;
  SELECT * FROM t1;
} {1 {ON CONFLICT clause does not match any PRIMARY KEY or UNIQUE constraint}}
do_catchsql_test upsert1-310 {
  DELETE FROM t1;
  INSERT INTO t1(a,b) VALUES(1,2),(3,2) ON CONFLICT(b) WHERE b!=10 DO NOTHING;
  SELECT * FROM t1;
} {1 {ON CONFLICT clause does not match any PRIMARY KEY or UNIQUE constraint}}
do_execsql_test upsert1-320 {
  DELETE FROM t1;
  INSERT INTO t1(a,b) VALUES(1,2),(3,2),(4,20),(5,20)
         ON CONFLICT(b) WHERE b>10 DO NOTHING;
  SELECT *, 'x' FROM t1 ORDER BY b, a;
} {1 2 0 x 3 2 0 x 4 20 0 x}

finish_test