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	- 补充 fsql.InsertOrUpdate UpdateColumns 数据存在时只更新指定的字段;
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		@@ -42,6 +42,19 @@ namespace FreeSql
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        /// <returns></returns>
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        IInsertOrUpdate<T1> IfExistsDoNothing();
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        /// <summary>
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        /// 当记录存在时,指定只更新的字段,UpdateColumns(a => a.Name) | UpdateColumns(a => new{a.Name,a.Time}) | UpdateColumns(a => new[]{"name","time"})
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        /// </summary>
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        /// <param name="columns">lambda选择列</param>
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        /// <returns></returns>
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        IInsertOrUpdate<T1> UpdateColumns(Expression<Func<T1, object>> columns);
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        /// <summary>
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        /// 当记录存在时,指定只更新的字段
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        /// </summary>
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        /// <param name="columns">属性名,或者字段名</param>
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        /// <returns></returns>
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        IInsertOrUpdate<T1> UpdateColumns(string[] columns);
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        /// <summary>
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        /// 设置表名规则,可用于分库/分表,参数1:默认表名;返回值:新表名;
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        /// </summary>
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