Question

可以使用自定义类来为我从KV商店中输入/获取数据。

也可以使用jdbc创建表中的INSERTING / SELECTING数据。这样我就可以获得名为SQL_PUBLIC_TABLENAME的缓存。

但是我找不到使用SQL查询从KV-store INSERT / SELECT数据的方法。我已经使用@QuerySqlField注释创建了自定义值类和定义的字段，如下所示：

@QuerySqlField(index = true)
public Integer id;

@QuerySqlField(index = true)
public String records_offset;

@QuerySqlField(index = true)
public Integer session_id;

然后我用这种方式使用xml-config定义了缓存：

<property name="cacheConfiguration">
    <bean class="org.apache.ignite.configuration.CacheConfiguration">
        <!-- Set a cache name. -->
        <property name="name" value="test"/>

        <property name="queryEntities">
            <list>
                <bean class="org.apache.ignite.cache.QueryEntity">
                   <property name="keyType" value="java.lang.Integer"/>
                   <property name="valueType" value="CDR"/>
                   <property name="tableName" value="CDR"/>
                   <property name="fields">
                       <map>
                           <entry key="id" value="java.lang.Long"/>
                           <entry key="records_offset" value="java.lang.String"/>
                           <entry key="session_id" value="java.lang.Integer"/>
                       </map>
                   </property>

               </bean>
           </list>
        </property>

        <!-- Set cache mode. -->
        <property name="cacheMode" value="PARTITIONED"/>
    </bean>
</property>

我有可以放入/获取数据的缓存，我也可以使用sqlline工具连接到Ignite，在那里我可以看到带有test模式的CDR表（以及其他创建通过jdbc）：

0: jdbc:ignite:thin://127.0.0.1/> !tables
+--------------------------------+--------------------------------+--------------------------------+
|           TABLE_CAT            |          TABLE_SCHEM           |           TABLE_NAME           |
+--------------------------------+--------------------------------+--------------------------------+
|                                | PUBLIC                         | CITY                           |
|                                | test                           | CDR                            |
|                                | PUBLIC                         | PERSON                         |
|                                | PUBLIC                         | TEST2                          |
|                                | PUBLIC                         | LOL                            |
|                                | PUBLIC                         | TEST                           |
+--------------------------------+--------------------------------+--------------------------------+

但我既不能读取数据也不能将数据放入CDR表中：

    0: jdbc:ignite:thin://127.0.0.1/> DROP table CDR;
Error: Table doesn't exist: CDR (state=42000,code=0)
java.sql.SQLException: Table doesn't exist: CDR
        at org.apache.ignite.internal.jdbc.thin.JdbcThinConnection.sendRequest(JdbcThinConnection.java:671)
        at org.apache.ignite.internal.jdbc.thin.JdbcThinStatement.execute0(JdbcThinStatement.java:130)
        at org.apache.ignite.internal.jdbc.thin.JdbcThinStatement.execute(JdbcThinStatement.java:299)
        at sqlline.Commands.execute(Commands.java:823)
        at sqlline.Commands.sql(Commands.java:733)
        at sqlline.SqlLine.dispatch(SqlLine.java:795)
        at sqlline.SqlLine.begin(SqlLine.java:668)
        at sqlline.SqlLine.start(SqlLine.java:373)
        at sqlline.SqlLine.main(SqlLine.java:265)
0: jdbc:ignite:thin://127.0.0.1/> select * from CDR;
Error: Failed to parse query: select * from CDR (state=42000,code=0)
java.sql.SQLException: Failed to parse query: select * from CDR
        at org.apache.ignite.internal.jdbc.thin.JdbcThinConnection.sendRequest(JdbcThinConnection.java:671)
        at org.apache.ignite.internal.jdbc.thin.JdbcThinStatement.execute0(JdbcThinStatement.java:130)
        at org.apache.ignite.internal.jdbc.thin.JdbcThinStatement.execute(JdbcThinStatement.java:299)
        at sqlline.Commands.execute(Commands.java:823)
        at sqlline.Commands.sql(Commands.java:733)
        at sqlline.SqlLine.dispatch(SqlLine.java:795)
        at sqlline.SqlLine.begin(SqlLine.java:668)
        at sqlline.SqlLine.start(SqlLine.java:373)
        at sqlline.SqlLine.main(SqlLine.java:265)
0: jdbc:ignite:thin://127.0.0.1/> insert into CDR(ID,  RECORDS_OFFSET, SESSION_ID) values (23, '12', 123);
Error: Failed to parse query: insert into CDR(ID,  RECORDS_OFFSET, SESSION_ID) values (23, '12', 123) (state=42000,code=0)
java.sql.SQLException: Failed to parse query: insert into CDR(ID,  RECORDS_OFFSET, SESSION_ID) values (23, '12', 123)
        at org.apache.ignite.internal.jdbc.thin.JdbcThinConnection.sendRequest(JdbcThinConnection.java:671)
        at org.apache.ignite.internal.jdbc.thin.JdbcThinStatement.execute0(JdbcThinStatement.java:130)
        at org.apache.ignite.internal.jdbc.thin.JdbcThinStatement.execute(JdbcThinStatement.java:299)
        at sqlline.Commands.execute(Commands.java:823)
        at sqlline.Commands.sql(Commands.java:733)
        at sqlline.SqlLine.dispatch(SqlLine.java:795)
        at sqlline.SqlLine.begin(SqlLine.java:668)
        at sqlline.SqlLine.start(SqlLine.java:373)
        at sqlline.SqlLine.main(SqlLine.java:265)
0: jdbc:ignite:thin://127.0.0.1/>

Answer 1

您需要使用架构名称来访问此表：

select * from "test".CDR;

或

从＆＃34; test.CDR＆＃34;;

中选择*

此外，如果这不会有帮助，请尝试使用大写设置CacheConfiguration.setSqlSchema，例如＆＃34; PUBLIC＆＃34;并使用此架构名称

如何使用jdbc从Ignite KV存储中读取数据？

1 个答案: