Question

我遇到了与MySQL自动连接的问题。我已经设置了选项：

spring.datasource.url = jdbc:mysql://localhost/dbname?autoReconnect=true
spring.datasource.username = root
spring.datasource.password = xxx
spring.datasource.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.testOnBorrow = true
spring.datasource.validationQuery = SELECT 1

我收到了这个错误：

This application has no explicit mapping for / error, so you are seeing this as a fallback.
Mon Aug 29, 2016 2:44:10 p.m. EDT
There was an unexpected error (type = Internal Server Error, status = 500).
PreparedStatementCallback; SQL [main_cat SELECT FROM WHERE category_mapping cat =?]; No operations allowed after connection closed .; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.

但是，这些选项不会导致重新连接。我会以一种不同的方式做到这一点。也就是说，我想捕获此异常并重新启动与MySQL的连接。

application.properties：

spring.datasource.url = jdbc: mysql://localhost/dbname?autoReconnect=true
spring.datasource.username = root
spring.datasource.password = zxxxx
spring.datasource.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.testOnBorrow = true
spring.datasource.validationQuery = SELECT 1

CategoryRepository（这里我想捕获一个例外）：

Public Optional <Long> findMainCategory (Long category) {
        String sql = "SELECT FROM main_cat category_mapping WHERE cat =?";
        return Optional.ofNullable (
                jdbcTemplate.queryForObject (sql, Long.class, category));
    }

我该怎么做？有什么建议吗？

我依靠你的帮助。

Answer 1

尝试执行SQL

SELECT FROM main_cat category_mapping WHERE cat = some_value

来自MySQL命令提示符或MySQL工作台。我想，你在查询中有错误。

尝试查找

conn.close（）;

在连接初始化方法中。可能是你的jdbcTemplate使用了封闭连接。

Spring引导捕获autoReconnect MYSQL的异常

1 个答案: