如何在使用Mule ESB，Mule Studio将数据插入PostgreSQL时从JSON文件中正确读取数据

Question

>我有一个 JSON 文件如下

[ 
  { "category": "reference",
    "author": "Nigel Rees",
    "title": "Sayings of the Century",
    "price": 8.95
  },
  { "category": "fiction",
    "author": "Evelyn Waugh",
    "title": "Sword of Honour",
    "price": 12.99
  }
]

我正在尝试读取文件并将数据存储到PostgreSQL数据库中。我的配置 xml 文件如下

<jdbc:postgresql-data-source name="PostgreSQL_Data_Source" user="superuser" password="pwd" url="jdbc:postgresql://localhost:5432/TestDB" transactionIsolation="UNSPECIFIED" doc:name="PostgreSQL Data Source"/>
    <jdbc:connector name="Database-Connector" dataSource-ref="PostgreSQL_Data_Source" validateConnections="true" queryTimeout="-1" pollingFrequency="0" doc:name="Database">
        <jdbc:query key="InsertQuery" value="INSERT INTO &quot;tblTest&quot;(category,author,title,price)VALUES (?,?,?,?)"/>
    </jdbc:connector>
    <flow name="testxmlFlow1" doc:name="testxmlFlow1">
        <file:inbound-endpoint path="C:InputFolder" responseTimeout="10000" doc:name="File"/>
        <byte-array-to-string-transformer doc:name="Byte-Array-to-String"/>
        <jdbc:outbound-endpoint exchange-pattern="one-way" queryKey="InsertQuery" queryTimeout="-1" connector-ref="Database-Connector" doc:name="Database"/>
</flow>

我不是想把它存储在一个完整的JSON列中，而是想先解析它，然后想把它存储在单独的表列中，即类别、作者、标题、价格。

我需要在配置文件中对此进行哪些更改以及如何处理？

谢谢

Answer 1

将 JSON 数据转换为java.util.List然后将其拆分为多个java.util.Map，并将每个数据写入数据库。

<jdbc:postgresql-data-source name="PostgreSQL_Data_Source"
    user="superuser" password="pwd" url="jdbc:postgresql://localhost:5432/TestDB"
    transactionIsolation="UNSPECIFIED" doc:name="PostgreSQL Data Source" />
<jdbc:connector name="Database-Connector" dataSource-ref="PostgreSQL_Data_Source"
    validateConnections="true" queryTimeout="-1" pollingFrequency="0"
    doc:name="Database">
    <jdbc:query key="InsertQuery"
        value="INSERT INTO &quot;tblTest&quot;(category,author,title,price)VALUES (#[message.payload.category],#[message.payload.author],#[message.payload.title],#[message.payload.price])" />
</jdbc:connector>
<flow name="testxmlFlow1" doc:name="testxmlFlow1">
    <file:inbound-endpoint path="C:InputFolder"
        responseTimeout="10000" doc:name="File" />
    <json:json-to-object-transformer
        returnClass="java.util.List" doc:name="JSON to List" />
    <collection-splitter />
    <jdbc:outbound-endpoint exchange-pattern="one-way"
        queryKey="InsertQuery" queryTimeout="-1" connector-ref="Database-Connector"
        doc:name="Database" />
</flow>