/**
* Method declaration
*
*
* @return
*
* @throws Exception
*/
public Result processUpdate()
{
string token = tTokenizer.getstring();
cChannel.checkReadWrite();
cChannel.check(token, Access.UPDATE);
Table table = dDatabase.getTable(token, cChannel);
TableFilter filter = new TableFilter(table, null, false);
tTokenizer.getThis("SET");
ArrayList vColumn = new ArrayList();
ArrayList eColumn = new ArrayList();
int len = 0;
token = null;
do
{
len++;
int i = table.getColumnNr(tTokenizer.getstring());
vColumn.Add(i);
tTokenizer.getThis("=");
Expression e = parseExpression();
e.resolve(filter);
eColumn.Add(e);
token = tTokenizer.getstring();
} while (token.Equals(","));
Expression eCondition = null;
if (token.Equals("WHERE"))
{
eCondition = parseExpression();
eCondition.resolve(filter);
filter.setCondition(eCondition);
}
else
{
tTokenizer.back();
}
// do the update
Expression[] exp = new Expression[len];
eColumn.CopyTo(exp);
int[] col = new int[len];
int[] type = new int[len];
for (int i = 0; i < len; i++)
{
col[i] = ((int) vColumn[i]);
type[i] = table.getType(col[i]);
}
int count = 0;
if (filter.findFirst())
{
Result del = new Result(); // don't need column count and so on
Result ins = new Result();
int size = table.getColumnCount();
do
{
if (eCondition == null || eCondition.test())
{
object[] nd = filter.oCurrentData;
del.add(nd);
object[] ni = table.getNewRow();
for (int i = 0; i < size; i++)
{
ni[i] = nd[i];
}
for (int i = 0; i < len; i++)
{
ni[col[i]] = exp[i].getValue(type[i]);
}
ins.add(ni);
}
} while (filter.next());
cChannel.beginNestedTransaction();
try
{
Record nd = del.rRoot;
while (nd != null)
{
table.deleteNoCheck(nd.data, cChannel);
nd = nd.next;
}
Record ni = ins.rRoot;
while (ni != null)
{
table.insertNoCheck(ni.data, cChannel);
ni = ni.next;
count++;
}
table.checkUpdate(col, del, ins);
ni = ins.rRoot;
while (ni != null)
{
ni = ni.next;
}
cChannel.endNestedTransaction(false);
}
catch (Exception e)
{
// update failed (violation of primary key / referential integrity)
cChannel.endNestedTransaction(true);
throw e;
}
}
Result r = new Result();
r.iUpdateCount = count;
return r;
}
// [email protected] end changes from 1.50 // [email protected] begin changes from 1.50 public Result getResult(int start, int cnt) { int maxrows = start + cnt; //<-new, cut definitly // [email protected] begin changes from 1.50 resolve(); checkResolved(); if (sUnion != null && sUnion.iResultLen != iResultLen) { throw Trace.error(Trace.COLUMN_COUNT_DOES_NOT_MATCH); } int len = eColumn.Length; Result r = new Result(len); bool aggregated = false; bool grouped = false; for (int i = 0; i < len; i++) { Expression e = eColumn[i]; r.iType[i] = e.getDataType(); if (e.isAggregate()) { aggregated = true; } } object[] agg = null; if (aggregated) { agg = new object[len]; } if (iGroupLen > 0) { // has been set in Parser grouped = true; } bool simple_maxrows = false; if (maxrows != 0 && grouped == false && sUnion == null && iOrderLen == 0) { simple_maxrows = true; } else { simple_maxrows = false; } int count = 0; int filter = tFilter.Length; bool[] first = new bool[filter]; int level = 0; while (level >= 0) { TableFilter t = tFilter[level]; bool found; if (!first[level]) { found = t.findFirst(); first[level] = found; } else { found = t.next(); first[level] = found; } if (!found) { level--; continue; } if (level < filter - 1) { level++; continue; } if (eCondition == null || eCondition.test()) { object[] row = new object[len]; for (int i = 0; i < len; i++) { row[i] = eColumn[i].getValue(); } count++; if (aggregated) { updateAggregateRow(agg, row, len); } else { r.add(row); if (simple_maxrows && count >= maxrows) { break; } } } } if (aggregated && !grouped) { addAggregateRow(r, agg, len, count); } else if (grouped) { int[] order = new int[iGroupLen]; int[] way = new int[iGroupLen]; for (int i = iResultLen, j = 0; j < iGroupLen; i++, j++) { order[j] = i; way[j] = 1; } r = sortResult(r, order, way); Record n = r.rRoot; Result x = new Result(len); for (int i = 0; i < len; i++) { x.iType[i] = r.iType[i]; } do { object[] row = new object[len]; count = 0; bool newgroup = false; while (n != null && newgroup == false) { count++; for (int i = 0; i < iGroupLen; i++) { if (n.next == null) { newgroup = true; } else if (Column.compare(n.data[i], n.next.data[i], r.iType[i]) != 0) { // can't use .Equals because 'null' is also one group newgroup = true; } } updateAggregateRow(row, n.data, len); n = n.next; } addAggregateRow(x, row, len, count); } while (n != null); r = x; } if (iOrderLen != 0) { int[] order = new int[iOrderLen]; int[] way = new int[iOrderLen]; for (int i = iResultLen, j = 0; j < iOrderLen; i++, j++) { order[j] = i; way[j] = eColumn[i].isDescending() ? -1 : 1; } r = sortResult(r, order, way); } // the result is maybe bigger (due to group and order by) // but don't tell this anybody else r.setColumnCount(iResultLen); if (bDistinct) { r = removeDuplicates(r); } for (int i = 0; i < iResultLen; i++) { Expression e = eColumn[i]; r.sLabel[i] = e.getAlias(); r.sTable[i] = e.getTableName(); r.sName[i] = e.getColumnName(); } if (sUnion != null) { Result x = sUnion.getResult(0); if (iUnionType == UNION) { r.append(x); r = removeDuplicates(r); } else if (iUnionType == UNIONALL) { r.append(x); } else if (iUnionType == INTERSECT) { r = removeDuplicates(r); x = removeDuplicates(x); r = removeDifferent(r, x); } else if (iUnionType == EXCEPT) { r = removeDuplicates(r); x = removeDuplicates(x); r = removeSecond(r, x); } } if (maxrows > 0 && !simple_maxrows) { trimResult(r, maxrows); } // [email protected] begin changes from 1.50 if (start > 0) { //then cut the first 'start' elements trimResultFront(r, start); } // [email protected] end changes from 1.50 return(r); }
/**
* Method declaration
*
*
* @return
*
* @throws Exception
*/
public Result processDelete()
{
tTokenizer.getThis("FROM");
string token = tTokenizer.getstring();
cChannel.checkReadWrite();
cChannel.check(token, Access.DELETE);
Table table = dDatabase.getTable(token, cChannel);
TableFilter filter = new TableFilter(table, null, false);
token = tTokenizer.getstring();
Expression eCondition = null;
if (token.Equals("WHERE"))
{
eCondition = parseExpression();
eCondition.resolve(filter);
filter.setCondition(eCondition);
}
else
{
tTokenizer.back();
}
int count = 0;
if (filter.findFirst())
{
Result del = new Result(); // don't need column count and so on
do
{
if (eCondition == null || eCondition.test())
{
del.add(filter.oCurrentData);
}
} while (filter.next());
Record n = del.rRoot;
while (n != null)
{
table.delete(n.data, cChannel);
count++;
n = n.next;
}
}
Result r = new Result();
r.iUpdateCount = count;
return r;
}
