node.js拼接mysql工具

2018-03-01 11:06:40来源:segmentfault作者:等风来人点击

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node.js中拼接mysql工具

前一阵子被迫分享了一次node.JS,在写sql时真是恼火的不得了。之前写php的时候发现php真是机智,php的双引号是可以识别变量的,而js就惨了,当写sql查询时,写变量得拼字符串,然后sql里本身就有不少的字符串,js的字符串还要单双循环。我真是欲哭无泪啊,写一个稍稍复杂点sql,就要改好几次。从网上找了半天,最后果断写一个。目前只支持增删改查,适合给用nodejs做后台写个小demo的玩家。


上源码:


var sqlJoin = (function () {
var whereResolve = function (type, whereSwitch) {
if (whereSwitch.where) {
type += ' WHERE ';
}
var keyAry = (whereSwitch && whereSwitch.whereProp) ? whereSwitch.whereProp : [];
if (keyAry.length) {for (let i = 0; i < keyAry.length; i++) {
let c = keyAry[i];
if (typeof c == 'object') {
for (var key in c) {
if (key != 'operator') type += '`' + key + '`' + (c['operator'] ? c['operator'] : '=') + '' + "'" + c[key] + "'";
}
} else if (/(AND)?(OR)?/.test(c)) {
type += ' ' + c + ' ';
} else if (/(/()?(/))?/.test(c)) {
type += c;
}
}
}
var likeKeyArr = whereSwitch.likeProp ? Object.keys(whereSwitch.likeProp) : [];
if (likeKeyArr.length) {
if (likeKeyArr.length > 1) {
for (let j = 0; j < likeKeyArr.length; j++) {
let cur = likeKeyArr[j];
if (j == likeKeyArr.length - 1) {
type += cur + ' LIKE ' + "'%" + whereSwitch.likeProp[cur] + "%'";
} else {
type += cur + ' LIKE ' + "'%" + whereSwitch.likeProp[cur] + "%'" + ' AND ';
}
}
} else {
for (let key in whereSwitch.likeProp) {
type += key + ' LIKE ' + "'%" + whereSwitch.likeProp[key] + "%'";
}
}
}
return type;
};
/**
* @param sqlType Object query type-> 'INSERT' 'DELETE' 'UPDATE' 'SELECT'
* @param tableName String the name of the enqueried table
* @param whereSwitch [,Object] config the WHERE sentence
* @param limitSwitch [,Object] config the LIMIT sentence
* @returns String the sql query string joined by sqlJoin function

var sqlJoin = function (sqlType, tableName, whereSwitch, limitSwitch) {
var SELECT = '',
UPDATE = '',
DELETE = '',
INSERT = '';
switch (sqlType.type) {
case 'SELECT':
SELECT = 'SELECT ';
if (sqlType.distinct) {
SELECT += ' DISTINCT '
}
sqlType.prop = sqlType.prop ? sqlType.prop : [];
if (sqlType.prop && sqlType.prop.length) {
for (let i = 0; i < sqlType.prop.length; i++) {
var cur = sqlType.prop[i];
if (i == sqlType.prop.length - 1) {
SELECT += '`' + cur + '`';
} else {
SELECT += '`' + cur + '`,';
}
}
} else {
SELECT += ' *'
}
SELECT += ' FROM ' + '`' + tableName + '`';
if (whereSwitch) {
SELECT = whereResolve(SELECT, whereSwitch);
}var orderArr = sqlType.orderProp ? Object.keys(sqlType.orderProp) : [];
if (orderArr.length) {
SELECT += ' ORDER BY ';
for (let m = 0; m < orderArr.length; m++) {
let c = orderArr[m];
if (m == orderArr.length - 1) {
if (sqlType.orderProp[c]) {
SELECT += c + ' ASC'
} else {
SELECT += c + ' DESC'
}
} else {
if (sqlType.orderProp[c]) {
SELECT += c + ' ASC, '
} else {
SELECT += c + ' DESC, '
}
}
}
}if (limitSwitch && limitSwitch.limit) {
SELECT += ' LIMIT ' + limitSwitch.num;
}break;
case 'UPDATE':
UPDATE = 'UPDATE ';
UPDATE += tableName + ' SET ';
var updatekeys = Object.keys(sqlType.prop);
for (let i = 0; i < updatekeys.length; i++) {
var cur = updatekeys[i];
if (i == updatekeys.length - 1) {
UPDATE += '`' + cur + '` =' + "'" + sqlType.prop[cur] + "'";
} else {
UPDATE += '`' + cur + '` =' + "'" + sqlType.prop[cur] + "', ";
}
}
if (whereSwitch && whereSwitch.where) {
UPDATE = whereResolve(UPDATE, whereSwitch);
}
if (limitSwitch && limitSwitch.limit) {
UPDATE += ' LIMIT ' + limitSwitch.num;
}
break;
case 'DELETE':
DELETE = 'DELETE FROM ' + tableName;
if (whereSwitch && whereSwitch.where) {
DELETE = whereResolve(DELETE, whereSwitch);
}
if (limitSwitch && limitSwitch.limit) {
DELETE += ' LIMIT ' + limitSwitch.num;
}
break;
case 'INSERT':
INSERT = 'INSERT INTO ' + tableName;
var insertProp = Object.keys(sqlType.prop);
if (insertProp.length) {
for (let i = 0, len = insertProp.length; i < len; i++) {
var cur = insertProp[i];
if (i == 0) {
INSERT += '(`' + cur;
} else if (i == len - 1) {
INSERT += '`' + cur + '`)';
} else {
INSERT += '`, `' + cur + '`, ';}
}
INSERT += ' VALUES ';
for (let j = 0, leng = insertProp.length; j < leng; j++) {
var curr = insertProp[j];
if (j == 0) {
INSERT += "('" + sqlType.prop[curr];
} else if (j == leng - 1) {
INSERT += "'" + sqlType.prop[curr] + "')";
} else {
INSERT += "','" + sqlType.prop[curr] + "', ";}
}
}
break;
}
return {SELECT, UPDATE, DELETE, INSERT}[sqlType.type];
};
return sqlJoin
})();
exports.sqlJoin = sqlJoin;
用法示例:
新增
var str = sqlJoin(
{type: 'INSERT', prop: {mNum: 7570, mName: '晓鑫', points: 14}},
'members',
{limit: true, num: 1}
);
console.log(str);
//INSERT INTO members(`mNum`, `mName`, `points`) VALUES ('7570','晓鑫', '14')
删除
var str = sqlJoin(
{type: 'DELETE'},
'members',
{where: true, whereProp: [{mId: 67}]},
{limit: true, num: 1}
);
console.log(str);
//DELETE FROM members WHERE `mId`='67' LIMIT 1修改
var str = sqlJoin(
{type: 'UPDATE', prop: {points: 14}},
'members',
{where: true, whereProp: [{mId: 24}]},
{limit: true, num: 1}
);
console.log(str);
//UPDATE members SET `points` ='14' WHERE `mId`='24' LIMIT 1
查询—— %
var str = sqlJoin(
{type: 'SELECT'},
'members',
{where: true, likeProp: {mNum: 75, mName: '刘', points: 12}},
{limit: false, num: 1}
);
console.log(str);
//SELECT* FROM `members` WHERE mNum LIKE '%75%' AND mName LIKE '%刘%' AND points LIKE '%12%'
查询—— % + AND/OR
var str = sqlJoin(
{type: 'SELECT'},
'members',
{where: true, whereProp: [{'mNum': 7501, operator: '='},'OR', {mName: '刘想',operator: '='}, 'AND',{points: 5, operator: '>'}]},
{limit: false, num: 1}
);
console.log(str);
//SELECT* FROM `members` WHERE `mNum`='7501' OR `mName`='刘想'
查询——% + AND+OR
var str = sqlJoin(
{type: 'SELECT'},
'members',
{where: true, whereProp: ['(', {'mNum': 7501, operator: '='},'OR', {mName: '刘想',operator: '='},')', 'AND',{points: 5, operator: '>'}]},
{limit: false, num: 1}
);
console.log(str);
//SELECT * FROM `members` WHERE ( `mNum`='7501' OR `mName`='刘想' ) AND `points`>'5'
查询——DESC/ASC
//true: ASC,false: DESC
var str = sqlJoin(
{type: 'SELECT', orderProp: {points:false}},
'members'
);
console.log(str);
//SELECT* FROM `members` ORDER BY points DESC
查询——WHERE
var str = sqlJoin(
{type: 'SELECT', prop: ['mName','points','mNum'], orderProp: {points: true}},
'members',
{where: true, whereProp: [{mId: 2, operator: '>'}]}
);
console.log(str);
//SELECT `mName`,`points`,`mNum` FROM `members` WHERE `mId`='24'
查询——distinct
/*var str = sqlJoin(
{type: 'SELECT', distinct: true, prop: ['points'], orderProp: {points: true}},
'members',
{where: true, whereProp: [{mId: 2, operator: '>'}]}
);
console.log(str);
//SELECTDISTINCT `points` FROM `members` WHERE `mId`>'2' ORDER BY points ASC

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