Code_query_lookup.cpp
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:5k
源码类别:
MySQL数据库
开发平台:
Visual C++
- /* 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 <common/StmtArea.hpp>
- #include <dictionary/DictTable.hpp>
- #include <dictionary/DictColumn.hpp>
- #include "Code_query_lookup.hpp"
- #include "Code_column.hpp"
- #include "Code_expr.hpp"
- #include "Code_root.hpp"
- // Plan_query_lookup
- Plan_query_lookup::~Plan_query_lookup()
- {
- }
- Plan_base*
- Plan_query_lookup::analyze(Ctx& ctx, Ctl& ctl)
- {
- ctx_assert(m_table != 0);
- m_table->analyze(ctx, ctl);
- if (! ctx.ok())
- return 0;
- return this;
- }
- Exec_base*
- Plan_query_lookup::codegen(Ctx& ctx, Ctl& ctl)
- {
- // set up
- ctx_assert(m_table != 0);
- const BaseString& tableName = m_table->getName();
- const DictTable& dictTable = m_table->dictTable();
- const unsigned keyCount = dictTable.keyCount();
- const ColumnVector& columns = m_table->exprColumns();
- ctx_assert(columns.size() > 0);
- const unsigned attrCount = columns.size() - 1;
- // create the code
- Exec_query_lookup::Code& code = *new Exec_query_lookup::Code(keyCount, attrCount);
- code.m_tableName = strcpy(new char[tableName.length() + 1], tableName.c_str());
- // key attributes
- code.m_keyId = new NdbAttrId[1 + keyCount];
- code.m_keyId[0] = (NdbAttrId)-1;
- for (unsigned k = 1; k <= keyCount; k++) {
- const DictColumn* keyColumn = dictTable.getKey(k);
- const SqlType& sqlType = keyColumn->sqlType();
- SqlSpec sqlSpec(sqlType, SqlSpec::Physical);
- code.m_keySpecs.setEntry(k, sqlSpec);
- code.m_keyId[k] = keyColumn->getAttrId();
- }
- // matching expressions
- const Plan_table::Index& index = m_table->m_indexList[0];
- ctx_assert(index.m_keyFound);
- const ExprVector& keyEq = index.m_keyEq;
- ctx_assert(keyEq.size() == 1 + keyCount);
- code.m_keyMatch = new Exec_expr* [1 + keyCount];
- code.m_keyMatch[0] = 0;
- for (unsigned k = 1; k <= keyCount; k++) {
- Plan_expr* expr = keyEq[k];
- Exec_expr* execExpr = static_cast<Exec_expr*>(expr->codegen(ctx, ctl));
- if (! ctx.ok())
- return 0;
- ctx_assert(execExpr != 0);
- code.m_keyMatch[k] = execExpr;
- }
- // queried attributes
- code.m_attrId = new NdbAttrId[1 + attrCount];
- code.m_attrId[0] = (NdbAttrId)-1;
- for (unsigned i = 1; i <= attrCount; i++) {
- Plan_column* column = columns[i];
- ctx_assert(column != 0);
- const DictColumn& dictColumn = column->dictColumn();
- const SqlType& sqlType = dictColumn.sqlType();
- SqlSpec sqlSpec(sqlType, SqlSpec::Physical);
- code.m_sqlSpecs.setEntry(i, sqlSpec);
- code.m_attrId[i] = dictColumn.getAttrId();
- }
- // create the exec
- Exec_query_lookup* exec = new Exec_query_lookup(ctl.m_execRoot);
- ctl.m_execRoot->saveNode(exec);
- exec->setCode(code);
- return exec;
- }
- void
- Plan_query_lookup::print(Ctx& ctx)
- {
- ctx.print(" [query_lookup");
- Plan_base* a[] = { m_table };
- printList(ctx, a, 1);
- ctx.print("]");
- }
- // Exec_query_lookup
- Exec_query_lookup::Code::~Code()
- {
- delete[] m_tableName;
- delete[] m_keyId;
- delete[] m_keyMatch;
- delete[] m_attrId;
- }
- Exec_query_lookup::Data::~Data()
- {
- delete[] m_recAttr;
- }
- Exec_query_lookup::~Exec_query_lookup()
- {
- }
- void
- Exec_query_lookup::alloc(Ctx& ctx, Ctl& ctl)
- {
- const Code& code = getCode();
- // create data
- Data& data = *new Data(this, code.sqlSpecs());
- setData(data);
- // allocate matching expressions
- for (unsigned k = 1; k <= code.m_keyCount; k++) {
- Exec_expr* expr = code.m_keyMatch[k];
- ctx_assert(expr != 0);
- expr->alloc(ctx, ctl);
- if (! ctx.ok())
- return;
- }
- // needed for isNULL
- data.m_recAttr = new NdbRecAttr* [1 + code.m_attrCount];
- for (unsigned i = 0; i <= code.m_attrCount; i++) {
- data.m_recAttr[i] = 0;
- }
- }
- void
- Exec_query_lookup::close(Ctx& ctx)
- {
- Data& data = getData();
- if (data.m_con != 0) {
- Ndb* const ndb = ndbObject();
- ndb->closeTransaction(data.m_con);
- data.m_con = 0;
- data.m_op = 0;
- data.m_done = true;
- ctx_log2(("lookup closed at statement close"));
- }
- }
- void
- Exec_query_lookup::print(Ctx& ctx)
- {
- ctx.print(" [query_lookup");
- if (m_code != 0) {
- const Code& code = getCode();
- ctx.print(" keyId=");
- for (unsigned i = 1; i <= code.m_keyCount; i++) {
- if (i > 1)
- ctx.print(",");
- ctx.print("%u", (unsigned)code.m_keyId[i]);
- }
- ctx.print(" attrId=");
- for (unsigned i = 1; i <= code.m_attrCount; i++) {
- if (i > 1)
- ctx.print(",");
- ctx.print("%u", (unsigned)code.m_attrId[i]);
- }
- ctx.print(" table=%s", code.m_tableName);
- }
- ctx.print("]");
- }