diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/expr.c | 17 | ||||
| -rw-r--r-- | src/vdbe.c | 100 | ||||
| -rw-r--r-- | src/vdbeInt.h | 1 | ||||
| -rw-r--r-- | src/vdbemem.c | 57 |
4 files changed, 71 insertions, 104 deletions
diff --git a/src/expr.c b/src/expr.c index 0d2292e94..fabdae2fc 100644 --- a/src/expr.c +++ b/src/expr.c @@ -2595,26 +2595,13 @@ int sqlite3ExprCodeTarget(Parse *pParse, Expr *pExpr, int target){ #ifndef SQLITE_OMIT_CAST case TK_CAST: { /* Expressions of the form: CAST(pLeft AS token) */ - int aff, to_op; inReg = sqlite3ExprCodeTarget(pParse, pExpr->pLeft, target); - assert( !ExprHasProperty(pExpr, EP_IntValue) ); - aff = sqlite3AffinityType(pExpr->u.zToken, 0); - to_op = aff - SQLITE_AFF_TEXT + OP_ToText; - assert( to_op==OP_ToText || aff!=SQLITE_AFF_TEXT ); - assert( to_op==OP_ToBlob || aff!=SQLITE_AFF_NONE ); - assert( to_op==OP_ToNumeric || aff!=SQLITE_AFF_NUMERIC ); - assert( to_op==OP_ToInt || aff!=SQLITE_AFF_INTEGER ); - assert( to_op==OP_ToReal || aff!=SQLITE_AFF_REAL ); - testcase( to_op==OP_ToText ); - testcase( to_op==OP_ToBlob ); - testcase( to_op==OP_ToNumeric ); - testcase( to_op==OP_ToInt ); - testcase( to_op==OP_ToReal ); if( inReg!=target ){ sqlite3VdbeAddOp2(v, OP_SCopy, inReg, target); inReg = target; } - sqlite3VdbeAddOp1(v, to_op, inReg); + sqlite3VdbeAddOp2(v, OP_Cast, target, + sqlite3AffinityType(pExpr->u.zToken, 0)); testcase( usedAsColumnCache(pParse, inReg, inReg) ); sqlite3ExprCacheAffinityChange(pParse, inReg, 1); break; diff --git a/src/vdbe.c b/src/vdbe.c index 72a1552ce..ec2b64f77 100644 --- a/src/vdbe.c +++ b/src/vdbe.c @@ -1768,106 +1768,30 @@ case OP_RealAffinity: { /* in1 */ #endif #ifndef SQLITE_OMIT_CAST -/* Opcode: ToText P1 * * * * +/* Opcode: Cast P1 P2 * * * ** -** Force the value in register P1 to be text. -** If the value is numeric, convert it to a string using the -** equivalent of sprintf(). Blob values are unchanged and -** are afterwards simply interpreted as text. +** Force the value in register P1 to be the type defined by P2. +** +** <ul> +** <li value="97"> TEXT +** <li value="98"> BLOB +** <li value="99"> NUMERIC +** <li value="100"> INTEGER +** <li value="101"> REAL +** </ul> ** ** A NULL value is not changed by this routine. It remains NULL. */ -case OP_ToText: { /* same as TK_TO_TEXT, in1 */ +case OP_Cast: { /* in1 */ pIn1 = &aMem[pOp->p1]; memAboutToChange(p, pIn1); - if( pIn1->flags & MEM_Null ) break; - assert( MEM_Str==(MEM_Blob>>3) ); - pIn1->flags |= (pIn1->flags&MEM_Blob)>>3; - applyAffinity(pIn1, SQLITE_AFF_TEXT, encoding); rc = ExpandBlob(pIn1); - assert( pIn1->flags & MEM_Str || db->mallocFailed ); - pIn1->flags &= ~(MEM_Int|MEM_Real|MEM_Blob|MEM_Zero); + sqlite3VdbeMemCast(pIn1, pOp->p2, encoding); UPDATE_MAX_BLOBSIZE(pIn1); break; } - -/* Opcode: ToBlob P1 * * * * -** -** Force the value in register P1 to be a BLOB. -** If the value is numeric, convert it to a string first. -** Strings are simply reinterpreted as blobs with no change -** to the underlying data. -** -** A NULL value is not changed by this routine. It remains NULL. -*/ -case OP_ToBlob: { /* same as TK_TO_BLOB, in1 */ - pIn1 = &aMem[pOp->p1]; - if( pIn1->flags & MEM_Null ) break; - if( (pIn1->flags & MEM_Blob)==0 ){ - applyAffinity(pIn1, SQLITE_AFF_TEXT, encoding); - assert( pIn1->flags & MEM_Str || db->mallocFailed ); - MemSetTypeFlag(pIn1, MEM_Blob); - }else{ - pIn1->flags &= ~(MEM_TypeMask&~MEM_Blob); - } - UPDATE_MAX_BLOBSIZE(pIn1); - break; -} - -/* Opcode: ToNumeric P1 * * * * -** -** Force the value in register P1 to be numeric (either an -** integer or a floating-point number.) -** If the value is text or blob, try to convert it to an using the -** equivalent of atoi() or atof() and store 0 if no such conversion -** is possible. -** -** A NULL value is not changed by this routine. It remains NULL. -*/ -case OP_ToNumeric: { /* same as TK_TO_NUMERIC, in1 */ - pIn1 = &aMem[pOp->p1]; - sqlite3VdbeMemNumerify(pIn1); - break; -} #endif /* SQLITE_OMIT_CAST */ -/* Opcode: ToInt P1 * * * * -** -** Force the value in register P1 to be an integer. If -** The value is currently a real number, drop its fractional part. -** If the value is text or blob, try to convert it to an integer using the -** equivalent of atoi() and store 0 if no such conversion is possible. -** -** A NULL value is not changed by this routine. It remains NULL. -*/ -case OP_ToInt: { /* same as TK_TO_INT, in1 */ - pIn1 = &aMem[pOp->p1]; - if( (pIn1->flags & MEM_Null)==0 ){ - sqlite3VdbeMemIntegerify(pIn1); - } - break; -} - -#if !defined(SQLITE_OMIT_CAST) && !defined(SQLITE_OMIT_FLOATING_POINT) -/* Opcode: ToReal P1 * * * * -** -** Force the value in register P1 to be a floating point number. -** If The value is currently an integer, convert it. -** If the value is text or blob, try to convert it to an integer using the -** equivalent of atoi() and store 0.0 if no such conversion is possible. -** -** A NULL value is not changed by this routine. It remains NULL. -*/ -case OP_ToReal: { /* same as TK_TO_REAL, in1 */ - pIn1 = &aMem[pOp->p1]; - memAboutToChange(p, pIn1); - if( (pIn1->flags & MEM_Null)==0 ){ - sqlite3VdbeMemRealify(pIn1); - } - break; -} -#endif /* !defined(SQLITE_OMIT_CAST) && !defined(SQLITE_OMIT_FLOATING_POINT) */ - /* Opcode: Lt P1 P2 P3 P4 P5 ** Synopsis: if r[P1]<r[P3] goto P2 ** diff --git a/src/vdbeInt.h b/src/vdbeInt.h index 384c5eb37..3f84ba845 100644 --- a/src/vdbeInt.h +++ b/src/vdbeInt.h @@ -425,6 +425,7 @@ double sqlite3VdbeRealValue(Mem*); void sqlite3VdbeIntegerAffinity(Mem*); int sqlite3VdbeMemRealify(Mem*); int sqlite3VdbeMemNumerify(Mem*); +void sqlite3VdbeMemCast(Mem*,u8,u8); int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,int,Mem*); void sqlite3VdbeMemRelease(Mem *p); void sqlite3VdbeMemReleaseExternal(Mem *p); diff --git a/src/vdbemem.c b/src/vdbemem.c index 55e212d8c..22e213898 100644 --- a/src/vdbemem.c +++ b/src/vdbemem.c @@ -523,6 +523,51 @@ int sqlite3VdbeMemNumerify(Mem *pMem){ } /* +** Cast the datatype of the value in pMem according to the affinity +** "aff". Casting is different from applying affinity in that a cast +** is forced. In other words, the value is converted into the desired +** affinity even if that results in loss of data. This routine is +** used (for example) to implement the SQL "cast()" operator. +*/ +void sqlite3VdbeMemCast(Mem *pMem, u8 aff, u8 encoding){ + if( pMem->flags & MEM_Null ) return; + switch( aff ){ + case SQLITE_AFF_NONE: { /* Really a cast to BLOB */ + if( (pMem->flags & MEM_Blob)==0 ){ + sqlite3ValueApplyAffinity(pMem, SQLITE_AFF_TEXT, encoding); + assert( pMem->flags & MEM_Str || pMem->db->mallocFailed ); + MemSetTypeFlag(pMem, MEM_Blob); + }else{ + pMem->flags &= ~(MEM_TypeMask&~MEM_Blob); + } + break; + } + case SQLITE_AFF_NUMERIC: { + sqlite3VdbeMemNumerify(pMem); + break; + } + case SQLITE_AFF_INTEGER: { + sqlite3VdbeMemIntegerify(pMem); + break; + } + case SQLITE_AFF_REAL: { + sqlite3VdbeMemRealify(pMem); + break; + } + default: { + assert( aff==SQLITE_AFF_TEXT ); + assert( MEM_Str==(MEM_Blob>>3) ); + pMem->flags |= (pMem->flags&MEM_Blob)>>3; + sqlite3ValueApplyAffinity(pMem, SQLITE_AFF_TEXT, encoding); + assert( pMem->flags & MEM_Str || pMem->db->mallocFailed ); + pMem->flags &= ~(MEM_Int|MEM_Real|MEM_Blob|MEM_Zero); + break; + } + } +} + + +/* ** Delete any previous value and set the value stored in *pMem to NULL. */ void sqlite3VdbeMemSetNull(Mem *pMem){ @@ -1015,9 +1060,19 @@ static int valueFromExpr( *ppVal = 0; return SQLITE_OK; } - op = pExpr->op; + while( (op = pExpr->op)==TK_UPLUS ) pExpr = pExpr->pLeft; if( NEVER(op==TK_REGISTER) ) op = pExpr->op2; + if( op==TK_CAST ){ + u8 aff = sqlite3AffinityType(pExpr->u.zToken,0); + rc = valueFromExpr(db, pExpr->pLeft, enc, aff, ppVal, pCtx); + if( rc==SQLITE_OK && *ppVal ){ + sqlite3VdbeMemCast(*ppVal, aff, SQLITE_UTF8); + sqlite3ValueApplyAffinity(*ppVal, affinity, SQLITE_UTF8); + } + return rc; + } + /* Handle negative integers in a single step. This is needed in the ** case when the value is -9223372036854775808. */ |