字符串截取:substring_index(str,delim,count)
<span style="font-family:KaiTi_GB2312;font-size:18px;">concat(substring_index(a.sn, '_', 1), '_',?,'_', substring_index(a.sn, '_', -2))</span>

<span style="font-family:KaiTi_GB2312;font-size:18px;">update surgery_kit_store a set a.kitName=? , a.sn=concat(substring_index(a.sn, '_', 1), '_',?,'_', substring_index(a.sn, '_', -2)) where a.surgery_kit_fk=?</span>


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