MySQL 中怎么通过SUBSTRING_INDEX函数拆分字符串为数组单元，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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vim test.sh
#Define variables
MYSQL_HOME=/usr
SQL_SCRIPT_DB_CONNECTION_STRING='-uroot -p'root''
SQL_SCRIPT_PARAMETERS_LIST="'PARAM1 PARAM2 PARAM3'"
#Execute the command
#CMD_SQL_SCRIPT_EXECUTION=${MYSQL_HOME}/bin/mysql ${SQL_SCRIPT_DB_CONNECTION_STRING} -e "set @VAR1=$SQL_SCRIPT_PARAMETERS_LIST ; source ${SQL_SCRIPT_FILE_LOCATION}/${SQL_SCRIPT_NAME}.sql ;" >> ${myLogFile}
${MYSQL_HOME}/bin/mysql ${SQL_SCRIPT_DB_CONNECTION_STRING} -e "set @VAR=$SQL_SCRIPT_PARAMETERS_LIST;
set @VAR_NUM=length(@VAR)-length(REPLACE(@VAR,' ',''))+1; /* define the total number of the variables */
set @VAR_POS=0; /* define the variable position in the string */
/* define the variables' value, if the the variable doesn't exist, its value is null */
set @VAR_1 = if(@VAR_POS < @VAR_NUM,SUBSTRING_INDEX(SUBSTRING_INDEX(@VAR, ' ', @VAR_POS:=@VAR_POS+1),' ',-1),null);
set @VAR_2 = if(@VAR_POS < @VAR_NUM,SUBSTRING_INDEX(SUBSTRING_INDEX(@VAR, ' ', @VAR_POS:=@VAR_POS+1),' ',-1),null);
set @VAR_3 = if(@VAR_POS < @VAR_NUM,SUBSTRING_INDEX(SUBSTRING_INDEX(@VAR, ' ', @VAR_POS:=@VAR_POS+1),' ',-1),null);
set @VAR_4 = if(@VAR_POS < @VAR_NUM,SUBSTRING_INDEX(SUBSTRING_INDEX(@VAR, ' ', @VAR_POS:=@VAR_POS+1),' ',-1),null);
set @VAR_5 = if(@VAR_POS < @VAR_NUM,SUBSTRING_INDEX(SUBSTRING_INDEX(@VAR, ' ', @VAR_POS:=@VAR_POS+1),' ',-1),null);
set @VAR_6 = if(@VAR_POS < @VAR_NUM,SUBSTRING_INDEX(SUBSTRING_INDEX(@VAR, ' ', @VAR_POS:=@VAR_POS+1),' ',-1),null);
set @VAR_7 = if(@VAR_POS < @VAR_NUM,SUBSTRING_INDEX(SUBSTRING_INDEX(@VAR, ' ', @VAR_POS:=@VAR_POS+1),' ',-1),null);
select @VAR_1, @VAR_2, @VAR_3, @VAR_4, @VAR_5, @VAR_6, @VAR_7;"
sh test.sh
Warning: Using a password on the command line interface can be insecure.
+--------+--------+--------+--------+--------+--------+--------+
| @VAR_1 | @VAR_2 | @VAR_3 | @VAR_4 | @VAR_5 | @VAR_6 | @VAR_7 |
+--------+--------+--------+--------+--------+--------+--------+
| PARAM1 | PARAM2 | PARAM3 | NULL | NULL | NULL | NULL |
+--------+--------+--------+--------+--------+--------+--------+看完上述内容，你们掌握MySQL 中怎么通过SUBSTRING_INDEX函数拆分字符串为数组单元的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
