001/**
002 * Copyright (c) 2022-2023, Mybatis-Flex (fuhai999@gmail.com).
003 * <p>
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 * <p>
008 * http://www.apache.org/licenses/LICENSE-2.0
009 * <p>
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package com.mybatisflex.core.mybatis;
017
018import com.mybatisflex.core.audit.AuditManager;
019import org.apache.ibatis.cursor.Cursor;
020import org.apache.ibatis.executor.Executor;
021import org.apache.ibatis.executor.ExecutorException;
022import org.apache.ibatis.executor.parameter.ParameterHandler;
023import org.apache.ibatis.executor.statement.CallableStatementHandler;
024import org.apache.ibatis.executor.statement.SimpleStatementHandler;
025import org.apache.ibatis.executor.statement.StatementHandler;
026import org.apache.ibatis.mapping.BoundSql;
027import org.apache.ibatis.mapping.MappedStatement;
028import org.apache.ibatis.session.ResultHandler;
029import org.apache.ibatis.session.RowBounds;
030
031import java.sql.Connection;
032import java.sql.SQLException;
033import java.sql.Statement;
034import java.util.List;
035
036/**
037 * 参考 {@link org.apache.ibatis.executor.statement.RoutingStatementHandler}
038 * 主要作用：
039 * 1、替换 PreparedStatementHandler 为 FlexPreparedStatementHandler
040 * 2、进行数据审计
041 */
042public class FlexStatementHandler implements StatementHandler {
043
044    private final StatementHandler delegate;
045    private final BoundSql boundSql;
046    private final boolean auditEnable = AuditManager.isAuditEnable();
047
048    public FlexStatementHandler(Executor executor, MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) {
049
050        switch (ms.getStatementType()) {
051            case STATEMENT:
052                delegate = new SimpleStatementHandler(executor, ms, parameter, rowBounds, resultHandler, boundSql);
053                break;
054            case PREPARED:
055                // delegate = new PreparedStatementHandler(executor, ms, parameter, rowBounds, resultHandler, boundSql);
056                // use FlexPreparedStatementHandler to replace PreparedStatementHandler
057                delegate = new FlexPreparedStatementHandler(executor, ms, parameter, rowBounds, resultHandler, boundSql);
058                break;
059            case CALLABLE:
060                delegate = new CallableStatementHandler(executor, ms, parameter, rowBounds, resultHandler, boundSql);
061                break;
062            default:
063                throw new ExecutorException("Unknown statement type: " + ms.getStatementType());
064        }
065
066        this.boundSql = delegate.getBoundSql();
067    }
068
069    @Override
070    public Statement prepare(Connection connection, Integer transactionTimeout) throws SQLException {
071        return delegate.prepare(connection, transactionTimeout);
072    }
073
074    @Override
075    public void parameterize(Statement statement) throws SQLException {
076        delegate.parameterize(statement);
077    }
078
079    @Override
080    public void batch(Statement statement) throws SQLException {
081        if (auditEnable) {
082            AuditManager.startAudit(() -> {
083                delegate.batch(statement);
084                return null;
085            }, boundSql);
086        } else {
087            delegate.batch(statement);
088        }
089    }
090
091    @Override
092    public int update(Statement statement) throws SQLException {
093        return auditEnable ? AuditManager.startAudit(() -> delegate.update(statement), boundSql)
094                : delegate.update(statement);
095    }
096
097    @Override
098    public <E> List<E> query(Statement statement, ResultHandler resultHandler) throws SQLException {
099        return auditEnable ? AuditManager.startAudit(() -> delegate.query(statement, resultHandler), boundSql)
100                : delegate.query(statement, resultHandler);
101    }
102
103    @Override
104    public <E> Cursor<E> queryCursor(Statement statement) throws SQLException {
105        return auditEnable ? AuditManager.startAudit(() -> delegate.queryCursor(statement), boundSql)
106                : delegate.queryCursor(statement);
107    }
108
109    @Override
110    public BoundSql getBoundSql() {
111        return delegate.getBoundSql();
112    }
113
114    @Override
115    public ParameterHandler getParameterHandler() {
116        return delegate.getParameterHandler();
117    }
118
119}