Sharding-jdbc踩坑记录(一)

sharding jdbc学习链接

sharding-jdbc版本:2.0.3

springboot版本:2.1.5

连接池:druid 1.1.14

<!--代码片段-->
    <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.14</version>
        </dependency>
   <dependency>
            <groupId>io.shardingjdbc</groupId>
            <artifactId>sharding-jdbc-core</artifactId>
            <version>2.0.3</version>
        </dependency>    

异常1: 

Cannot find data source in sharding rule, invalid actual data node is: 'order_0.t_order_0'
原因:数据库连接名和交给shardingjdbc管理的连接名不匹配不匹配.
解决方式:
              

 /**
     * 配置数据源0，数据源的名称最好要有一定的规则，方便配置分库的计算规则
     *
     * @return
     */
    @Bean(name = "dataSource0")
    @ConfigurationProperties(prefix = "spring.datasource.test1")
    public DataSource dataSource0() {
        return DataSourceBuilder.create().build();
    }

    /**
     * 配置数据源1，数据源的名称最好要有一定的规则，方便配置分库的计算规则
     *
     * @return
     */
    @Bean(name = "dataSource1")
    @ConfigurationProperties(prefix = "spring.datasource.test2")
    public DataSource dataSource1() {
        return DataSourceBuilder.create().build();
    }

    /**
     * 配置数据源规则，即将多个数据源交给sharding-jdbc管理，并且可以设置默认的数据源，
     * 当表没有配置分库规则时会使用默认的数据源
     *
     * @return
     */
    public Map<String, DataSource> createDataSourceMap() {
        //设置分库映射
        Map<String, DataSource> dataSourceMap = new HashMap<>();
        dataSourceMap.put("order_0", dataSource0());
        dataSourceMap.put("order_1", dataSource1());
        return dataSourceMap;
    }
    /**
     * 设置表的node
     *
     * @return
     */
    @Bean
    TableRuleConfiguration getUserTableRuleConfiguration() {
        TableRuleConfiguration orderTableRuleConfig = new TableRuleConfiguration();
        orderTableRuleConfig.setLogicTable("t_order");
        orderTableRuleConfig.setActualDataNodes("order_${0..1}.t_order_${0..1}");
        orderTableRuleConfig.setKeyGeneratorColumnName("user_id");
        return orderTableRuleConfig;
    }
 /**
     * 配置分库分表策略
     *
     * @return
     * @throws SQLException
     */
    @Bean(name = "shardingDataSource")
    DataSource getShardingDataSource() throws SQLException {
        ShardingRuleConfiguration shardingRuleConfig;
        shardingRuleConfig = new ShardingRuleConfiguration();
        shardingRuleConfig.getTableRuleConfigs().add(getUserTableRuleConfiguration());
        shardingRuleConfig.getBindingTableGroups().add("t_order");
        shardingRuleConfig.setDefaultDatabaseShardingStrategyConfig(new StandardShardingStrategyConfiguration("order_id", DemoDatabaseShardingAlgorithm.class.getName()));
        shardingRuleConfig.setDefaultTableShardingStrategyConfig(new StandardShardingStrategyConfiguration("user_id", DemoTableShardingAlgorithm.class.getName()));
        ShardingRule build = shardingRuleConfig.build(createDataSourceMap());

        return new ShardingDataSource(build);
    }

这两处标记的地方要一直.因为在第一处标记的地方我们把数据源给了shardingjdbc进行管理,所以我们在给表进行jdbc设置分表规则时,也应该是拿在sharding中数据源的名字.