Mybatis 使用

引入maven依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.1</version>
</dependency>

<dependency>
    <groupId>org.hsqldb</groupId>
    <artifactId>hsqldb</artifactId>
    <scope>runtime</scope>
</dependency>

使用Interceptor监控SQL语句

1. 启动类添加@MapperScan("com.example.mapper")注解
2. properties文件指定mapper文件路径

server.port=8080
mybatis.mapper-locations=classpath:mapper/*.xml

3. 配置数据源DatasourceConfig.class

@Configuration
public class DatasourceConfig {
    private final static String JDBC_URL = "jdbc:hsqldb:file:testdb";
    private final static String JDBC_USERNAME = "SA";
    private final static String JDBC_PASSWORD = "";

    @Bean
    DataSource createDataSource() {
        HikariConfig config = new HikariConfig();
        config.setJdbcUrl(JDBC_URL);
        config.setUsername(JDBC_USERNAME);
        config.setPassword(JDBC_PASSWORD);
        config.setDriverClassName("org.hsqldb.jdbc.JDBCDriver");
        config.addDataSourceProperty("autoCommit", "true");
        config.addDataSourceProperty("connectionTimeout", "5");
        config.addDataSourceProperty("idleTimeout", "60");
        return new HikariDataSource(config);
    }

    @Bean
    JdbcTemplate createJdbcTemplate(@Autowired DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }
}

4. 执行SQL初始化脚本DatabaseInitializer.class

@Slf4j
@Component
public class DatabaseInitializer {
    @Autowired
    JdbcTemplate jdbcTemplate;

    @PostConstruct
    public void init() {
        createTable();
        insertData();
    }

    private void createTable() {
        log.info("初始化User表开始");
        jdbcTemplate.update("DROP TABLE IF EXISTS users");
        jdbcTemplate.update("CREATE TABLE IF NOT EXISTS users (" 
                + "id BIGINT IDENTITY NOT NULL PRIMARY KEY, " 
                + "email VARCHAR(100) NOT NULL, " 
                + "password VARCHAR(100) NOT NULL, " 
                + "username VARCHAR(100) NOT NULL, " 
                + "UNIQUE (email))");
        log.info("初始化User表结束");
    }

    private void insertData() {
        log.info("插入User表开始");
        jdbcTemplate.update("INSERT INTO users (id, email, password, username) values (1, '123@mm.com', '123456', 'Bob')");
        jdbcTemplate.update("INSERT INTO users (id, email, password, username) values (2, '124@mm.com', '123456', 'Bob')");
        jdbcTemplate.update("INSERT INTO users (id, email, password, username) values (3, '125@mm.com', '123456', 'Bob')");
        log.info("插入User表结束");
    }
}

5. 实现Interceptor接口

@Slf4j
@Component
@Intercepts(value = {
        @Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class}),
        @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class})
})
public class SqlInterceptor implements Interceptor {
    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        log.info("拦截器对象={}", invocation.toString());
        Object returnValue = null;
        try {
            MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
            String sqlId = mappedStatement.getId();
            if(sqlId.contains("History") || sqlId.contains("Tmp")){
                return invocation.proceed();
            }
            Object parameter = null;
            if (invocation.getArgs().length > 1) {
                parameter = invocation.getArgs()[1];
            }
            BoundSql boundSql = mappedStatement.getBoundSql(parameter);
            Configuration configuration = mappedStatement.getConfiguration();

            long start = System.currentTimeMillis();
            returnValue = invocation.proceed();
            long end = System.currentTimeMillis();
            long time = (end - start);
            String sql = getSql(configuration, boundSql, sqlId, time);
            log.info("拦截器={}", sql);
        } catch (Exception e) {
            log.error("拦截器异常");
        }
        return returnValue;
    }

    @Override
    public Object plugin(Object target) {
        log.info("Interceptor::plugin#target={}", target);
        if(target instanceof Executor){
            return Plugin.wrap(target, this);
        }
        return target;
    }

    @Override
    public void setProperties(Properties properties) {

    }

    public static String getSql(Configuration configuration, BoundSql boundSql, String sqlId, long time) {
        String sql = showSql(configuration, boundSql);
        StringBuilder str = new StringBuilder(100);
        str.append("【sqlId】").append(sqlId);
        str.append("【SQL耗时-").append(time).append("-毫秒】");
        str.append("【SQL】").append(sql);
        log.debug(str.toString());
        return str.toString();
    }

    public static String showSql(Configuration configuration, BoundSql boundSql) {
        Object parameterObject = boundSql.getParameterObject();
        List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
        String sql = boundSql.getSql().replaceAll("[\\s]+", " ");
        if (parameterMappings.size() > 0 && parameterObject != null) {
            TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
            if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
                sql = sql.replaceFirst("\\?", getParameterValue(parameterObject));
            } else {
                MetaObject metaObject = configuration.newMetaObject(parameterObject);
                for (ParameterMapping parameterMapping : parameterMappings) {
                    String propertyName = parameterMapping.getProperty();
                    if (metaObject.hasGetter(propertyName)) {
                        Object obj = metaObject.getValue(propertyName);
                        sql = sql.replaceFirst("\\?", getParameterValue(obj));
                    } else if (boundSql.hasAdditionalParameter(propertyName)) {
                        Object obj = boundSql.getAdditionalParameter(propertyName);
                        sql = sql.replaceFirst("\\?", getParameterValue(obj));
                    }
                }
            }
        }
        return sql;
    }

    private static String getParameterValue(Object obj) {
        String value = null;
        if (obj instanceof String) {
            value = "'" + obj.toString() + "'";
            value = value.replaceAll("\\\\", "\\\\\\\\");
            value = value.replaceAll("\\$", "\\\\\\$");
        } else if (obj instanceof Date) {
            DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
            value = "'" + formatter.format(obj) + "'";
        } else {
            if (obj != null) {
                value = obj.toString();
            } else {
                value = "";
            }
        }
        return value;
    }
}