mybatis使用

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pom.xml

```xml
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.1</version>
</dependency>
<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper-spring-boot-starter</artifactId>
    <version>1.2.10</version>
</dependency>
```

yml

```yml
mybatis:
    mapper-locations: classpath:xmls/**/*.xml
    configuration:
        map-underscore-to-camel-case: true
```

启动类

启动类增加@MapperScan(value = {"com.demo.store.dao"})注解

```java
@EnableScheduling
@EnableAsync
@MapperScan(value = {"com.demo.store.dao"})
@SpringBootApplication
public class App {

    public static void main( String[] args) {
        IdGeneratorOptions options = new IdGeneratorOptions();
        options.WorkerId = 4;//机器编码
        YitIdHelper.setIdGenerator(options);
        JwtUtil.initRSA();
        SpringApplication.run(App.class,args);
    }

}
```

mybatis拦截器

```java
@Slf4j
@Component
@Intercepts({
        @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 MybatisInterceptorColdChain implements Interceptor {

    @SuppressWarnings("unused")
    private Properties properties;

    public Object intercept(Invocation invocation) throws Throwable {
        MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
        Object parameter = null;
        if (invocation.getArgs().length > 1) {
            parameter = invocation.getArgs()[1];
        }
        String sqlId = mappedStatement.getId();
        String sqlName = mappedStatement.getSqlCommandType().name();
        BoundSql boundSql = mappedStatement.getBoundSql(parameter);
        Configuration configuration = mappedStatement.getConfiguration();
        Object returnValue = null;
        long start = System.currentTimeMillis();
        returnValue = invocation.proceed();
        long end = System.currentTimeMillis();
        long time = (end - start);
        String sql = getSql(configuration, boundSql, sqlId, time);

        if (sqlName.equals(SqlCommandType.UPDATE.toString())) {
            log.info("执行了UPDATE语句：" + sql);
        }
        if (sqlName.equals(SqlCommandType.INSERT.toString())) {
            log.info("执行了INSERT语句：" + sql);
        }
        if (sqlName.equals(SqlCommandType.DELETE.toString())) {
            log.info("执行了DELETE语句：" + sql);
        }
        if (time > 2000) {
            log.warn("时间过长的sql：" + sql);
        }
        return returnValue;
    }

    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);
        str.append(":");
        str.append(sql);
        str.append("    执行的时间为: ");
        str.append(time);
        str.append("ms");
        return str.toString();
    }

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

        }
        return value;
    }

    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("\\?", Matcher.quoteReplacement(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("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
                    } else if (boundSql.hasAdditionalParameter(propertyName)) {
                        Object obj = boundSql.getAdditionalParameter(propertyName);
                        sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
                    }
                }
            }
        }
        return sql;
    }

    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

    public void setProperties(Properties properties0) {
        this.properties = properties0;
    }
}
```

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