形如("'1','2','3'"),SQL in('1','2','3')拼接

service.java

String str1 = "1,2,3";
String str2 = "1,2,3,1,2,3,3,2,1";
String str3 = "1";

public static String getInStr(String str){
    String inStr = "";
    if(StringUtils.isNotBlank(str)) {
        String[] strAgg = str.split(",");
        if(strAgg != null && strAgg.length >0){
            for(String st: strAgg){
                inStr += "'"+st+"',";
            }
            inStr = inStr.substring(0,inStr.length()-1);
        }
    }

    return inStr;
}
//過濾重複的元素
public static String getInStr(String str){
    String inStr = "";
    Set<String> set = new HashSet<>();
    if(StringUtils.isNotBlank(str)) {
        String[] strAgg = str.split(",");
        if(strAgg != null && strAgg.length >0){
            for(String st: strAgg){
                if (set.add(st)){
                    inStr += "'"+st+"',";
                }
            }
            inStr = inStr.substring(0,inStr.length()-1);
        }
    }

    return inStr;
}




 

mapper.xml

<if test="str != null and str != ''">
        and temp.str in (${str})
</if>