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/* Copyright (C) 2003 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <NdbApi.hpp>
#include <common/StmtArea.hpp>
#include <common/ResultArea.hpp>
#include <codegen/Code_expr.hpp>
#include <codegen/Code_query_lookup.hpp>
#include <codegen/Code_table.hpp>
void
Exec_query_lookup::execImpl(Ctx& ctx, Ctl& ctl)
{
const Code& code = getCode();
Data& data = getData();
data.m_done = false;
Ndb* const ndb = ndbObject();
NdbConnection* const tcon = ndbConnection();
if (data.m_con != 0) {
ndb->closeTransaction(data.m_con);
data.m_con = 0;
data.m_op = 0;
ctx_log2(("lookup closed at re-execute"));
}
const bool unco = connArea().uncommitted();
if (! unco) {
// use new transaction to not run out of operations
data.m_con = ndb->startTransaction();
if (data.m_con == 0) {
ctx.pushStatus(ndb, "startTransaction");
return;
}
} else {
ctx_log3(("lookup using main transaction"));
}
data.m_op = (unco ? tcon : data.m_con)->getNdbOperation(code.m_tableName);
if (data.m_op == 0) {
ctx.pushStatus(ndb, (unco ? tcon : data.m_con), 0, "getNdbOperation");
return;
}
if (data.m_op->readTuple() == -1) {
ctx.pushStatus(ndb, (unco ? tcon : data.m_con), data.m_op, "readTuple");
return;
}
// key attributes
for (unsigned k = 1; k <= code.m_keyCount; k++) {
Exec_expr* exprMatch = code.m_keyMatch[k];
ctx_assert(exprMatch != 0);
exprMatch->evaluate(ctx, ctl);
if (! ctx.ok())
return;
const SqlField& keyMatch = exprMatch->getData().sqlField();
SqlField f(code.m_keySpecs.getEntry(k));
if (! keyMatch.cast(ctx, f)) {
data.m_done = true; // match is not possible
return;
}
const NdbAttrId keyId = code.m_keyId[k];
const void* addr = f.addr();
const char* value = static_cast<const char*>(addr);
if (data.m_op->equal(keyId, value) == -1) {
ctx.pushStatus(ndb, (unco ? tcon : data.m_con), data.m_op, "equal attrId=%u", (unsigned)keyId);
return;
}
}
// queried attributes
const SqlRow& sqlRow = data.sqlRow();
ctx_assert(sqlRow.count() == code.m_attrCount);
for (unsigned i = 1; i <= code.m_attrCount; i++) {
const NdbAttrId attrId = code.m_attrId[i];
SqlField& f = sqlRow.getEntry(i);
char* addr = static_cast<char*>(f.addr());
NdbRecAttr* recAttr = data.m_op->getValue(attrId, addr);
if (recAttr == 0) {
ctx.pushStatus(ndb, (unco ? tcon : data.m_con), data.m_op, "getValue attrId=%u", (unsigned)attrId);
return;
}
data.m_recAttr[i] = recAttr;
}
if (code.m_attrCount == 0) { // NDB requires one
(void)data.m_op->getValue((NdbAttrId)0);
}
data.setCount(0);
if ((unco ? tcon : data.m_con)->execute(unco ? NoCommit : Commit) == -1) {
// XXX when did 626 move to connection level
if ((unco ? tcon : data.m_con)->getNdbError().code != 626 && data.m_op->getNdbError().code != 626) {
ctx.pushStatus(ndb, (unco ? tcon : data.m_con), data.m_op, "execute xxx");
return;
}
data.m_done = true;
} else {
stmtArea().incTuplesFetched();
data.m_done = false;
}
if (! unco) {
ndb->closeTransaction(data.m_con);
data.m_con = 0;
data.m_op = 0;
ctx_log3(("lookup closed at execute"));
}
}
bool
Exec_query_lookup::fetchImpl(Ctx &ctx, Ctl& ctl)
{
const Code& code = getCode();
Data& data = getData();
// returns at most one row
if (data.m_done)
return false;
// set null bits
const SqlRow& sqlRow = data.sqlRow();
ctx_assert(sqlRow.count() == code.m_attrCount);
for (unsigned i = 1; i <= code.m_attrCount; i++) {
NdbRecAttr* recAttr = data.m_recAttr[i];
int isNULL = recAttr->isNULL();
SqlField& f = sqlRow.getEntry(i);
ctx_assert(isNULL == 0 || isNULL == 1);
f.sqlNull(isNULL == 1);
}
data.m_done = true;
return true;
}
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