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                # DB2 使用注意事項 ## LONG VARCHAR 字段 默認情況下MyBatis將LONG VARCHAR字段映射為`java.lang.String`類型, 數據庫字段映射為 `jdbcType="LONGVARCHAR"`。這樣映射會導致DB2在檢索數據時發生錯誤。DB2 的LONG VARCHAR字段應該被映射為 `java.lang.String`類型,數據庫類型應該是`jdbcType="VARCHAR"`。為了解決該問題, 使用`&lt;columnOverride&gt;`配置如下: ``` <table schema="DB2ADMIN" tableName="ALLTYPES" > <columnOverride column="LONG_VARCHAR_FIELD" javaType="java.lang.String" jdbcType="VARCHAR" /> </table> ```
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