多维表格
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'use strict';
/**
*
* @param input : 1,2,3,4
* @returns obj.query = (?,?,?,?) obj.params = [1,2,3,4]
*/
function prepareInClauseParams(input) {
let inElems = input.split(',')
let obj = {}
obj.whereQuery = ''
obj.whereParams = []
for (var j = 0; j < inElems.length; ++j) {
if (j === 0) {
//enclose with open parenthesis
obj.whereQuery += '('
}
if (j) {
obj.whereQuery += ','
}
// add q mark and push the variable
obj.whereQuery += '?'
obj.whereParams.push(inElems[j])
if (j === inElems.length - 1) {
//enclose with closing parenthesis
obj.whereQuery += ')'
}
}
//console.log(obj);
return obj
}
function prepareLikeValue(value) {
//return value.replace("~", "%");
return value.replace(/~/g, '%');
}
function prepareIsValue(value) {
//return value.replace("~", "%");
if (value === 'null') {
return null;
} else if (value === 'true') {
return true;
} else if (value === 'false') {
return false;
} else {
return null
}
}
function prepareBetweenValue(value) {
let values = value.split(',')
let obj = {}
obj.whereQuery = ''
obj.whereParams = []
if (values.length === 2) {
obj.whereQuery = ' ? and ? '
obj.whereParams.push(values[0])
obj.whereParams.push(values[1])
}
//console.log('prepareBetweenValue', obj);
return obj;
}
function replaceWhereParamsToQMarks(openParentheses, str, comparisonOperator) {
let converted = ''
if (openParentheses) {
for (var i = 0; i < str.length; ++i) {
if (str[i] === '(') {
converted += '('
} else {
converted += '??'
break;
}
}
} else {
if (comparisonOperator !== ' in ' && comparisonOperator !== ' between ')
converted = '?'
for (var i = str.length - 1; i >= 0; --i) {
if (str[i] === ')') {
converted += ')'
} else {
break;
}
}
}
return converted;
}
function getComparisonOperator(operator) {
switch (operator) {
case 'eq':
return '='
break;
case 'ne':
return '!='
break;
case 'lt':
return '<'
break;
case 'lte':
return '<='
break;
case 'gt':
return '>'
break;
case 'gte':
return '>='
break;
case 'is':
return ' is '
break;
case 'isnot':
return ' is not '
break;
// case 'isnull':
// return ' is NULL '
// break;
// case 'isnnull':
// return ' is not NULL '
// break;
case 'like':
return ' like '
break;
case 'nlike':
return ' not like '
break;
case 'in':
return ' in '
break;
case 'bw':
return ' between '
break;
default:
return null
break;
}
}
function getLogicalOperator(operator) {
switch (operator) {
case '~or':
return 'or'
break;
case '~and':
return 'and'
break;
// case '~not':
// return 'not'
// break;
case '~xor':
return 'xor'
break;
default:
return null
break;
}
}
exports.getConditionClause = function (whereInQueryParams, condType = 'where') {
let whereQuery = '';
let whereParams = [];
let grammarErr = 0;
let numOfConditions = whereInQueryParams.split(/~or|~and|~not|~xor/);
let logicalOperatorsInClause = whereInQueryParams.match(/(~or|~and|~not|~xor)/g)
if (numOfConditions && logicalOperatorsInClause && numOfConditions.length !== logicalOperatorsInClause.length + 1) {
console.log('conditions and logical operators mismatch', numOfConditions.length, logicalOperatorsInClause.length);
return
}
// console.log('numOfConditions',numOfConditions,whereInQueryParams);
// console.log('logicalOperatorsInClause',logicalOperatorsInClause);
for (var i = 0; i < numOfConditions.length; ++i) {
let variable = ''
let comparisonOperator = ''
let logicalOperator = ''
let variableValue = ''
let temp = ''
// split on commas
var arr = numOfConditions[i].split(',');
// consider first two splits only
var result = arr.splice(0, 2);
// join to make only 3 array elements
result.push(arr.join(','));
// variable, operator, variablevalue
if (result.length !== 3) {
grammarErr = 1;
break;
}
/**************** START : variable ****************/
//console.log(result);
variable = result[0].match(/\(+(.*)/);
// console.log('variable',variable);
if (!variable || variable.length !== 2) {
grammarErr = 1;
break;
}
// get the variableName and push
whereParams.push(variable[1])
// then replace the variable name with ??
temp = replaceWhereParamsToQMarks(true, result[0])
if (!temp) {
grammarErr = 1;
break;
}
whereQuery += temp
/**************** END : variable ****************/
/**************** START : operator and value ****************/
comparisonOperator = getComparisonOperator(result[1])
if (!comparisonOperator) {
grammarErr = 1;
break;
}
whereQuery += comparisonOperator
// get the variableValue and push to params
variableValue = result[2].match(/(.*?)\)/)
if (!variableValue || variableValue.length !== 2) {
grammarErr = 1;
break;
}
if (comparisonOperator === ' in ') {
let obj = prepareInClauseParams(variableValue[1])
whereQuery += obj.whereQuery
whereParams = whereParams.concat(obj.whereParams)
} else if (comparisonOperator === ' like ' || comparisonOperator === ' not like ') {
whereParams.push(prepareLikeValue(variableValue[1]))
} else if (comparisonOperator === ' is ') {
whereParams.push(prepareIsValue(variableValue[1]))
} else if (comparisonOperator === ' between ') {
let obj = prepareBetweenValue(variableValue[1])
whereQuery += obj.whereQuery
whereParams = whereParams.concat(obj.whereParams)
//console.log(whereQuery, whereParams);
} else {
whereParams.push(variableValue[1])
}
// then replace the variableValue with ?
temp = replaceWhereParamsToQMarks(false, result[2], comparisonOperator)
if (!temp) {
grammarErr = 1;
break;
}
whereQuery += temp
// only
if (numOfConditions.length !== -1 && i !== numOfConditions.length - 1) {
//console.log('finding logical operator for',logicalOperatorsInClause[i]);
logicalOperator = getLogicalOperator(logicalOperatorsInClause[i])
if (!logicalOperator) {
grammarErr = 1;
break;
}
whereQuery += getLogicalOperator(logicalOperatorsInClause[i])
}
/**************** END : operator ****************/
}
let obj = {}
obj['query'] = ''
obj['params'] = []
obj['err'] = grammarErr
// console.log(whereInQueryParams);
// console.log(whereQuery);
// console.log(whereParams);
// console.log(grammarErr);
// console.log('= = = = = = = = =');
if (!grammarErr) {
obj['query'] = whereQuery
obj['params'] = whereParams
}
return obj
}