I have an array with SQL statements:
var sql=[ "select sum(custo) as TOTAL from PRS_CUSTOS_MATERIAL ",
"select mes,sum(custo) as TOTAL from PRS_CUSTOS_MATERIAL GROUP BY mes"
];
and i need to put a where clause on each statement. The problem is when i have other clauses than WHERE i need to put the WHERE clause before all others. I try to do it like this but no luck.
var clauses=['GROUP','HAVING'];
_.forEach(sql, function (sq, key) {
clauses.map(function (clause) {
if (sq.indexOf(clause) !== -1) {
debugger;
sql[key]=[sq.slice(0, sq.indexOf(clause)), ' where '+obj.where_str+' ', sq.slice(sq.indexOf(clause))].join('');
return false;
}else{
debugger;
sql[key]=sq+" where " + obj.where_str;
return false;
}
});
});
I recommend for you to use RegExp to solve your problem.
Using the following RegExp you can find if the Select has GROUP or HAVING operators.
var pattern = /(select.*)((?:GROUP|HAVING).*)/i;
And then you can test this pattern against your array:
var arr = ['select mes,sum(custo) as TOTAL from PRS_CUSTOS_MATERIAL GROUP BY mes',
'select sum(custo) as TOTAL from PRS_CUSTOS_MATERIAL ',
'select sum(custo) as TOTAL from PRS_CUSTOS_MATERIAL HAVING sadsa'];
arr.forEach(function(select, index){
var n = pattern.exec(select); // execute the pattern agains the current Select
if(!n){ // if it not match any GROUP or HAVING,
arr[index] += arr[index] + ' your_WHERE '; // append your Where at the end
return;
} // if match, append yout Where in the middle
arr[index] = n[1] + ' your_WHERE ' + n[2];
});
The result will be:
0:"select mes,sum(custo) as TOTAL from PRS_CUSTOS_MATERIAL your_WHERE GROUP BY mes"
1:"select sum(custo) as TOTAL from PRS_CUSTOS_MATERIAL "
2:"select sum(custo) as TOTAL from PRS_CUSTOS_MATERIAL your_WHERE HAVING sadsa"
Hope it helps.
This is just a try from my side..please have a look.
The following code will add the new where clause just after the from ..
statement. So it will always be first.
var str= "select sum(custo) as TOTAL from PRS_CUSTOS_MATERIAL groupBy...."; var newStr = 'where something > 12' var first_part = str.substr(0,str.indexOf('from')+5); var second_part_tmp = str.substr(str.indexOf('from')+6); var second_part = second_part_tmp.substr(0,second_part_tmp.indexOf(' ')); var third_part = second_part_tmp.substr(second_part_tmp.indexOf(' ')); if(second_part.indexOf(' ')!=0){ } console.log(first_part,second_part, third_part); console.log([first_part,second_part,newStr, third_part].join(' '))
Thanks everybody, but i've simplified things. I just replace :where
var sql=[
"select sum(custo) as TOTAL from PRS_CUSTOS_MATERIAL :where",
"select mes,sum(custo) as TOTAL from PRS_CUSTOS_MATERIAL :where GROUP BY mes"
];
using
_.forEach(sql, function (sq, key) {
sq=sq.replace(":where", ' where '+obj.where_str);
sql[key]=sq
});
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.