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PostgreSQL 特有的事件字段。
pgsql.error_code
PostgreSQL 错误代码。
类型：long
pgsql.error_message
PostgreSQL 错误消息。
pgsql.error_severity
PostgreSQL 错误严重性。
pgsql.num_fields
如果 SELECT 查询成功，此字段设置为返回的字段数。
pgsql.num_rows
如果 SELECT 查询成功，此字段设置为返回的行数。
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