在 JDBC URL参数中加入：stringtype=unspecified

jdbc:postgresql://127.0.0.1:5656/xxx?stringtype=unspecified

官方对 stringtype 参数的解释：

stringtype ： String
Specify the type to use when binding PreparedStatement parameters set via setString(). If stringtype is set to VARCHAR (the default), such parameters will be sent to the server as varchar parameters. If stringtype is set to unspecified, parameters will be sent to the server as untyped values, and the server will attempt to infer an appropriate type. This is useful if you have an existing application that uses setString() to set parameters that are actually some other type, such as integers, and you are unable to change the application to use an appropriate method such as setInt().

当 stringtype=unspecified 时，statement.setString() 方法的参数将以未知的类型发送给Postgresql 数据库，由数据库根据表中字段的类型进行推定和自动转换。