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.Configuration;
029import org.apache.ibatis.session.ResultHandler;
030import org.apache.ibatis.session.RowBounds;
031
032import java.sql.Connection;
033import java.sql.SQLException;
034import java.sql.Statement;
035import java.util.List;
036
037/**
038 * 参考 {@link org.apache.ibatis.executor.statement.RoutingStatementHandler}
039 * 主要作用：
040 * 1、替换 PreparedStatementHandler 为 FlexPreparedStatementHandler
041 * 2、进行数据审计
042 */
043public class FlexStatementHandler implements StatementHandler {
044
045    private final StatementHandler delegate;
046    private final BoundSql boundSql;
047    private final boolean auditEnable = AuditManager.isAuditEnable();
048    private final Configuration configuration;
049
050    public FlexStatementHandler(Executor executor, MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) {
051        configuration = ms.getConfiguration();
052        switch (ms.getStatementType()) {
053            case STATEMENT:
054                delegate = new SimpleStatementHandler(executor, ms, parameter, rowBounds, resultHandler, boundSql);
055                break;
056            case PREPARED:
057                // use FlexPreparedStatementHandler to replace PreparedStatementHandler
058                delegate = new FlexPreparedStatementHandler(executor, ms, parameter, rowBounds, resultHandler, boundSql);
059                break;
060            case CALLABLE:
061                delegate = new CallableStatementHandler(executor, ms, parameter, rowBounds, resultHandler, boundSql);
062                break;
063            default:
064                throw new ExecutorException("Unknown statement type: " + ms.getStatementType());
065        }
066
067        this.boundSql = delegate.getBoundSql();
068    }
069
070    @Override
071    public Statement prepare(Connection connection, Integer transactionTimeout) throws SQLException {
072        return delegate.prepare(connection, transactionTimeout);
073    }
074
075    @Override
076    public void parameterize(Statement statement) throws SQLException {
077        delegate.parameterize(statement);
078    }
079
080    @Override
081    public void batch(Statement statement) throws SQLException {
082        if (auditEnable) {
083            AuditManager.startAudit(() -> {
084                delegate.batch(statement);
085                return null;
086            }, statement, boundSql, configuration);
087        } else {
088            delegate.batch(statement);
089        }
090    }
091
092    @Override
093    public int update(Statement statement) throws SQLException {
094        return auditEnable ? AuditManager.startAudit(() -> delegate.update(statement), statement, boundSql, configuration)
095            : delegate.update(statement);
096    }
097
098    @Override
099    public <E> List<E> query(Statement statement, ResultHandler resultHandler) throws SQLException {
100        return auditEnable ? AuditManager.startAudit(() -> delegate.query(statement, resultHandler), statement, boundSql, configuration)
101            : delegate.query(statement, resultHandler);
102    }
103
104    @Override
105    public <E> Cursor<E> queryCursor(Statement statement) throws SQLException {
106        return auditEnable ? AuditManager.startAudit(() -> delegate.queryCursor(statement), statement, boundSql, configuration)
107            : delegate.queryCursor(statement);
108    }
109
110    @Override
111    public BoundSql getBoundSql() {
112        return delegate.getBoundSql();
113    }
114
115    @Override
116    public ParameterHandler getParameterHandler() {
117        return delegate.getParameterHandler();
118    }
119
120}