private void FindDependencies(Component instruction, ref Schema schema)
{
var dependencies = instruction.Dependencies;
foreach (var dependency in dependencies)
{
var componentTo = FindComponent(dependency);
schema.Components.Add(componentTo.Name);
schema.AddConnection(instruction.Name, dependency, componentTo.Name);
FindDependencies(componentTo, ref schema);
}
}
public static void SimpleResolved(Component instruction, ref Schema schema)
{
var dependencies = instruction.Dependencies;
foreach (var dependency in dependencies)
{
var componentTo = FindComponent(dependency);
schema.Components.Add(componentTo.Name);
schema.AddConnection(instruction.Name, dependency, componentTo.Name);
SimpleResolved(componentTo, ref schema);
}
}
public Schema GenerateSchema(string instructionName)
{
var instruction = _db.Instructions.FirstOrDefault(i => i.Name == instructionName);
if (instruction == null)
{
throw new Exception("нет такой инструкции");
}
var schema = new Schema();
//ResolvedAlgorithm.SimpleResolved(instruction, ref schema);
FindDependencies(instruction, ref schema);
return schema;
}
static bool sqlite3SchemaMutexHeld(object X, int y, Schema z)
{
return true;
}
static WRC LookupName(Parse parse, string dbName, string tableName, string colName, NameContext nc, Expr expr)
{
int cnt = 0; // Number of matching column names
int cntTab = 0; // Number of matching table names
int subquerys = 0; // How many levels of subquery
Context ctx = parse.Ctx; // The database connection
SrcList.SrcListItem item; // Use for looping over pSrcList items
SrcList.SrcListItem match = null; // The matching pSrcList item
NameContext topNC = nc; // First namecontext in the list
Schema schema = null; // Schema of the expression
bool isTrigger = false;
int i, j;
Debug.Assert(nc != null); // the name context cannot be NULL.
Debug.Assert(colName != null); // The Z in X.Y.Z cannot be NULL
Debug.Assert(!E.ExprHasAnyProperty(expr, EP.TokenOnly | EP.Reduced));
// Initialize the node to no-match
expr.TableId = -1;
expr.Table = null;
E.ExprSetIrreducible(expr);
// Translate the schema name in zDb into a pointer to the corresponding schema. If not found, pSchema will remain NULL and nothing will match
// resulting in an appropriate error message toward the end of this routine
if (dbName != null)
{
for (i = 0; i < ctx.DBs.length; i++)
{
Debug.Assert(ctx.DBs[i].Name != null);
if (string.Compare(ctx.DBs[i].Name, dbName) == 0)
{
schema = ctx.DBs[i].Schema;
break;
}
}
}
// Start at the inner-most context and move outward until a match is found
while (nc != null && cnt == 0)
{
ExprList list;
SrcList srcList = nc.SrcList;
if (srcList != null)
{
for (i = 0; i < srcList.Srcs; i++)
{
item = srcList.Ids[i];
Table table = item.Table;
Debug.Assert(table != null && table.Name != null);
Debug.Assert(table.Cols.length > 0);
if (item.Select != null && (item.Select.SelFlags & SF.NestedFrom) != 0)
{
bool hit = false;
list = item.Select.EList;
for (j = 0; j < list.Exprs; j++)
{
if (Walker.MatchSpanName(list.Ids[j].Span, colName, tableName, dbName))
{
cnt++;
cntTab = 2;
match = item;
expr.ColumnId = j;
hit = true;
}
}
if (hit || table == null)
{
continue;
}
}
if (dbName != null && table.Schema != schema)
{
continue;
}
if (tableName != null)
{
string tableName2 = (item.Alias != null ? item.Alias : table.Name);
Debug.Assert(tableName2 != null);
if (!string.Equals(tableName2, tableName, StringComparison.OrdinalIgnoreCase))
{
continue;
}
}
if (cntTab++ == 0)
{
match = item;
}
Column col;
for (j = 0; j < table.Cols.length; j++)
{
col = table.Cols[j];
if (string.Equals(col.Name, colName, StringComparison.InvariantCultureIgnoreCase))
{
// If there has been exactly one prior match and this match is for the right-hand table of a NATURAL JOIN or is in a
// USING clause, then skip this match.
if (cnt == 1)
{
if ((item.Jointype & JT.NATURAL) != 0)
{
continue;
}
if (NameInUsingClause(item.Using, colName))
{
continue;
}
}
cnt++;
match = item;
// Substitute the rowid (column -1) for the INTEGER PRIMARY KEY
expr.ColumnId = (j == table.PKey ? -1 : (short)j);
break;
}
}
}
if (match != null)
{
expr.TableId = match.Cursor;
expr.Table = match.Table;
schema = expr.Table.Schema;
}
}
#if !OMIT_TRIGGER
// If we have not already resolved the name, then maybe it is a new.* or old.* trigger argument reference
if (dbName == null && tableName != null && cnt == 0 && parse.TriggerTab != null)
{
TK op = parse.TriggerOp;
Table table = null;
Debug.Assert(op == TK.DELETE || op == TK.UPDATE || op == TK.INSERT);
if (op != TK.DELETE && string.Equals("new", tableName, StringComparison.InvariantCultureIgnoreCase))
{
expr.TableId = 1;
table = parse.TriggerTab;
}
else if (op != TK.INSERT && string.Equals("old", tableName, StringComparison.InvariantCultureIgnoreCase))
{
expr.TableId = 0;
table = parse.TriggerTab;
}
if (table != null)
{
int colId;
schema = table.Schema;
cntTab++;
for (colId = 0; colId < table.Cols.length; colId++)
{
Column col = table.Cols[colId];
if (string.Equals(col.Name, colName, StringComparison.InvariantCultureIgnoreCase))
{
if (colId == table.PKey)
{
colId = -1;
}
break;
}
}
if (colId >= table.Cols.length && Expr.IsRowid(colName))
{
colId = -1; // IMP: R-44911-55124
}
if (colId < table.Cols.length)
{
cnt++;
if (colId < 0)
{
expr.Aff = AFF.INTEGER;
}
else if (expr.TableId == 0)
{
C.ASSERTCOVERAGE(colId == 31);
C.ASSERTCOVERAGE(colId == 32);
parse.Oldmask |= (colId >= 32 ? 0xffffffff : (((uint)1) << colId));
}
else
{
C.ASSERTCOVERAGE(colId == 31);
C.ASSERTCOVERAGE(colId == 32);
parse.Newmask |= (colId >= 32 ? 0xffffffff : (((uint)1) << colId));
}
expr.ColumnId = (short)colId;
expr.Table = table;
isTrigger = true;
}
}
}
#endif
// Perhaps the name is a reference to the ROWID
if (cnt == 0 && cntTab == 1 && Expr.IsRowid(colName))
{
cnt = 1;
expr.ColumnId = -1; // IMP: R-44911-55124
expr.Aff = AFF.INTEGER;
}
// If the input is of the form Z (not Y.Z or X.Y.Z) then the name Z might refer to an result-set alias. This happens, for example, when
// we are resolving names in the WHERE clause of the following command:
//
// SELECT a+b AS x FROM table WHERE x<10;
//
// In cases like this, replace pExpr with a copy of the expression that forms the result set entry ("a+b" in the example) and return immediately.
// Note that the expression in the result set should have already been resolved by the time the WHERE clause is resolved.
if (cnt == 0 && (list = nc.EList) != null && tableName == null)
{
for (j = 0; j < list.Exprs; j++)
{
string asName = list.Ids[j].Name;
if (asName != null && string.Equals(asName, colName, StringComparison.InvariantCultureIgnoreCase))
{
Debug.Assert(expr.Left == null && expr.Right == null);
Debug.Assert(expr.x.List == null);
Debug.Assert(expr.x.Select == null);
Expr orig = list.Ids[j].Expr;
if ((nc.NCFlags & NC.AllowAgg) == 0 && E.ExprHasProperty(orig, EP.Agg))
{
parse.ErrorMsg("misuse of aliased aggregate %s", asName);
return(WRC.Abort);
}
ResolveAlias(parse, list, j, expr, "", subquerys);
cnt = 1;
match = null;
Debug.Assert(tableName == null && dbName == null);
goto lookupname_end;
}
}
}
// Advance to the next name context. The loop will exit when either we have a match (cnt>0) or when we run out of name contexts.
if (cnt == 0)
{
nc = nc.Next;
subquerys++;
}
}
// If X and Y are NULL (in other words if only the column name Z is supplied) and the value of Z is enclosed in double-quotes, then
// Z is a string literal if it doesn't match any column names. In that case, we need to return right away and not make any changes to
// pExpr.
//
// Because no reference was made to outer contexts, the pNC->nRef fields are not changed in any context.
if (cnt == 0 && tableName == null && E.ExprHasProperty(expr, EP.DblQuoted))
{
expr.OP = TK.STRING;
expr.Table = null;
return(WRC.Prune);
}
// cnt==0 means there was not match. cnt>1 means there were two or more matches. Either way, we have an error.
if (cnt != 1)
{
string err = (cnt == 0 ? "no such column" : "ambiguous column name");
if (dbName != null)
{
parse.ErrorMsg("%s: %s.%s.%s", err, dbName, tableName, colName);
}
else if (tableName != null)
{
parse.ErrorMsg("%s: %s.%s", err, tableName, colName);
}
else
{
parse.ErrorMsg("%s: %s", err, colName);
}
parse.CheckSchema = 1;
topNC.Errs++;
}
// If a column from a table in pSrcList is referenced, then record this fact in the pSrcList.a[].colUsed bitmask. Column 0 causes
// bit 0 to be set. Column 1 sets bit 1. And so forth. If the column number is greater than the number of bits in the bitmask
// then set the high-order bit of the bitmask.
if (expr.ColumnId >= 0 && match != null)
{
int n = expr.ColumnId;
C.ASSERTCOVERAGE(n == BMS - 1);
if (n >= BMS)
{
n = BMS - 1;
}
Debug.Assert(match.Cursor == expr.TableId);
match.ColUsed |= ((Bitmask)1) << n;
}
// Clean up and return
Expr.Delete(ctx, ref expr.Left);
expr.Left = null;
Expr.Delete(ctx, ref expr.Right);
expr.Right = null;
expr.OP = (isTrigger ? TK.TRIGGER : TK.COLUMN);
lookupname_end:
if (cnt == 1)
{
Debug.Assert(nc != null);
Auth.Read(parse, expr, schema, nc.SrcList);
// Increment the nRef value on all name contexts from TopNC up to the point where the name matched.
for (; ;)
{
Debug.Assert(topNC != null);
topNC.Refs++;
if (topNC == nc)
{
break;
}
topNC = topNC.Next;
}
return(WRC.Prune);
}
return(WRC.Abort);
}
