SpringBoot整合MybatisSQL过滤@Intercepts的实现

SpringBoot整合MybatisSQL过滤@Intercepts的实现

场景：

系统模块查询数据库需要根据用户的id去筛选数据。那么如果在 每个sql加user_id的过滤显然不明确。所以要在查询前将sql拼接上条件，做统一管理。

开发环境：

spring boot + mybatis

只需一个拦截类即可搞定（在看代码前需要了解注解@Intercepts()）：

@Component

@Intercepts({ @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class }) })

public class SqlInterceptor implements Interceptor {

private Logger logger = LoggerFactory.getLogger(SqlInterceptor.class);

@Override

public Object intercept(Invocation invocation) throws Throwable {

logger.info("Interceptor......");

// 获取http://sql

MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];

Object parameter = invocation.getArgs()[1];

BoundSql boundSql = mappedStatement.getBoundSql(parameter);

String oldsql = boundSql.getSql();

logger.info("old:"+oldsql);

// 判断sql是否有where条件。改变sql。

boolean status = oldsql.toLowerCase().contains("where");

if (status) {

BoundSql newBoundSql = new BoundSql(mappedStatement.getConfiguration(), oldsql + " and 1=1",

boundSql.getParameterMappings(), boundSql.getParameterObject());

MappedStatement newMs = copyFromMappedStatement(mappedStatement, new BoundSqlSqlSource(newBoundSql));

invocation.getArgs()[0] = newMs;

}

// 继续执行

Object result = invocation.proceed();

return result;

}

@Override

public Object plugin(Object target) {

return Plugin.wrap(target, this);

}

@Override

public void setProperties(Properties properties)http:// {

}

// 复制原始MappedStatement

private MappedStatement copyFromMappedStatement(MappedStatement ms, SqlSource newSqlSource) {

MappedStatement.Builder builder = new MappedStatement.Builder(ms.getConfiguration(), ms.getId(), newSqlSource,

ms.getSqlCommandType());

builder.resource(ms.getResource());

builder.fetchSize(ms.getFetchSize());

builder.statementType(ms.getStatementType());

builder.keyGenerator(ms.getKeyGenerator());

if (ms.getKeyProperties() != null) {

for (String keyProperty : ms.getKeyProperties()) {

builder.keyProperty(keyProperty);

}

}

builder.timeout(ms.getTimeout());

builder.parameterMap(ms.getParameterMap());

builder.resultMaps(ms.getResultMaps());

builder.cache(ms.getCache());

builder.useCache(ms.isUseCache());

return builder.build();

}

public static class BoundSqlSqlSource implements SqlSource {

BoundSql boundSql;

public BoundSqlSqlSource(BoundSql boundSql) {

this.boundSql = boundSql;

}

public BoundSql getBoundSql(Object parameterObject) {

return boundSql;

}

}

}

这样重启访问即可发现每次查询都会走这边！

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