/*
** The expression is the default value for the most recently added column
** of the table currently under construction.
**
** Default value expressions must be constant. Raise an exception if this
** is not the case.
**
** This routine is called by the parser while in the middle of
** parsing a CREATE TABLE statement.
*/
static void sqlite3AddDefaultValue(Parse pParse, ExprSpan pSpan)
{
Table p;
Column pCol;
sqlite3 db = pParse.db;
p = pParse.pNewTable;
if (p != null)
{
pCol = (p.aCol[p.nCol - 1]);
if (sqlite3ExprIsConstantOrFunction(pSpan.pExpr) == 0)
{
sqlite3ErrorMsg(pParse, "default value of column [%s] is not constant",
pCol.zName);
}
else
{
/* A copy of pExpr is used instead of the original, as pExpr contains
** tokens that point to volatile memory. The 'span' of the expression
** is required by pragma table_info.
*/
sqlite3ExprDelete(db, ref pCol.pDflt);
pCol.pDflt = sqlite3ExprDup(db, pSpan.pExpr, EXPRDUP_REDUCE);
sqlite3DbFree(db, ref pCol.zDflt);
pCol.zDflt = pSpan.zStart.Substring(0, pSpan.zStart.Length - pSpan.zEnd.Length);
//sqlite3DbStrNDup( db, pSpan.zStart,
// (int)( pSpan.zEnd.Length - pSpan.zStart.Length ) );
}
}
sqlite3ExprDelete(db, ref pSpan.pExpr);
}
/*
** Set the ExprList.a[].zSpan element of the most recently added item
** on the expression list.
**
** pList might be NULL following an OOM error. But pSpan should never be
** NULL. If a memory allocation fails, the pParse.db.mallocFailed flag
** is set.
*/
static void sqlite3ExprListSetSpan(
Parse pParse, /* Parsing context */
ExprList pList, /* List to which to add the span. */
ExprSpan pSpan /* The span to be added */
)
{
sqlite3 db = pParse.db;
Debug.Assert( pList != null /*|| db.mallocFailed != 0 */ );
if ( pList != null )
{
ExprList_item pItem = pList.a[pList.nExpr - 1];
Debug.Assert( pList.nExpr > 0 );
Debug.Assert( /* db.mallocFailed != 0 || */ pItem.pExpr == pSpan.pExpr );
sqlite3DbFree( db, ref pItem.zSpan );
pItem.zSpan = pSpan.zStart.Substring( 0, pSpan.zStart.Length <= pSpan.zEnd.Length ? pSpan.zStart.Length : pSpan.zStart.Length - pSpan.zEnd.Length );// sqlite3DbStrNDup( db, pSpan.zStart,
//(int)( pSpan.zEnd- pSpan.zStart) );
}
}
/*
** The expression is the default value for the most recently added column
** of the table currently under construction.
**
** Default value expressions must be constant. Raise an exception if this
** is not the case.
**
** This routine is called by the parser while in the middle of
** parsing a CREATE TABLE statement.
*/
static void sqlite3AddDefaultValue(Parse pParse, ExprSpan pSpan)
{
Table p;
Column pCol;
sqlite3 db = pParse.db;
p = pParse.pNewTable;
if (p != null)
{
pCol = (p.aCol[p.nCol - 1]);
if (sqlite3ExprIsConstantOrFunction(pSpan.pExpr) == 0)
{
sqlite3ErrorMsg(pParse, "default value of column [%s] is not constant",
pCol.zName);
}
else
{
/* A copy of pExpr is used instead of the original, as pExpr contains
** tokens that point to volatile memory. The 'span' of the expression
** is required by pragma table_info.
*/
sqlite3ExprDelete(db, ref pCol.pDflt);
pCol.pDflt = sqlite3ExprDup(db, pSpan.pExpr, EXPRDUP_REDUCE);
sqlite3DbFree(db, ref pCol.zDflt);
pCol.zDflt = pSpan.zStart.Substring(0, pSpan.zStart.Length - pSpan.zEnd.Length);
//sqlite3DbStrNDup( db, pSpan.zStart,
// (int)( pSpan.zEnd.Length - pSpan.zStart.Length ) );
}
}
sqlite3ExprDelete(db, ref pSpan.pExpr);
}
