在之前，我写了一个websql的封装类库，代码如下：
(function(win) { function smpWebSql(options){ options = options || {}; this.database = null; this.DateBaseName = options.DateBaseName || 'SmpDB'; this.Version = options.Version || '1.0'; this.Description = options.Description || 'SmpDB'; this.DataBaseSize = options.DataBaseSize || 2 * 1024 * 1024; this.init(); } smpWebSql.prototype = { init: function() { this.database = openDatabase(this.DateBaseName, this.Version, this.Description, this.DataBaseSize); //初始化数据库 }, addBlob: function (tableName, arr,index,isFirst,callback) {//批量添加字段 /* 注 ： 数据里面的第一个key存储类型为BLOB @param tableName 表名 @param arr 更新的数据 [{key1：value1 , key2 : value2 ...},{key1：value1 , key2 : value2 ...}] @param index BLOG字段所在的索引位置 @param isFirst 是否是第一次创建表 @param callback 回调 */ if (arr == null) { return this; } callback = this.isFunction(callback) ? callback : new Function(); var _me = this, _db = this.database, keyC = [], keyI = [], _key = ''; arr = arr || []; if (arr && arr.constructor == Array) { for (var i in arr[0]) { keyC.push(i); keyI.push(i); } _key = keyI.join(","); index = index == undefined ? 0 : index; keyC[index] = keyC[index] + ' BLOB'; _db.transaction(function (tx, result) { //var csql = 'CREATE TABLE IF NOT EXISTS ' + tableName + ' (' + keyC.join(",") + ')'; //console.log('csql:' + csql); if (isFirst == true) { tx.executeSql('CREATE TABLE IF NOT EXISTS ' + tableName + ' (' + keyC.join(",") + ')'); } //var sql = ""; for (var s = 0, _len = arr.length; s < _len ; s++) { var _value = _me.split(arr[s]); //sql += 'INSERT INTO ' + tableName + ' (' + _key + ') VALUES (' + _value + ')'; //console.log("sql:" + sql); tx.executeSql('INSERT INTO ' + tableName + ' (' + _key + ') VALUES (' + _value + ')',[],function (tx, result) { callback(result.rowsAffected); //console.log('添加成功'+result.rowsAffected); },function (tx, error) { console.error('添加失败'); callback(false); }); } _key = keyI = keyC = null; callback(); }); } return this; }, add: function (tableName, arr, callback, noKey) {//批量添加字段 /* 注 ： 数据里面的第一个key 为主键 @param tableName 表名 @param arr 更新的数据 [{key1：value1 , key2 : value2 ...},{key1：value1 , key2 : value2 ...}] @param callback 回调 @param noKey 第一个字段是否是主键（默认是） */ if(arr==null){ return this; } callback = this.isFunction(callback) ? callback : new Function(); var _me = this, _db = this.database, keyC = [], keyI = [], _key = ''; arr = arr || []; if (arr && arr.constructor == Array) { for(var i in arr[0]){ keyC.push(i); keyI.push(i); } if (noKey==undefined) { keyC[0] = keyC[0] + ' unique'; } _key = keyI.join(","); _db.transaction(function (tx) { ///var csql = 'CREATE TABLE IF NOT EXISTS ' + tableName + ' (' + keyC.join(",") + ')'; // console.log('csql:' + csql); tx.executeSql('CREATE TABLE IF NOT EXISTS ' + tableName + ' (' + keyC.join(",") + ')'); //var sql = ""; for(var s = 0 , _len = arr.length; s < _len ; s++){ var _value = _me.split(arr[s]); //sql += 'INSERT INTO ' + tableName + ' (' + _key + ') VALUES (' + _value + ')'; //console.log("sql:" + sql); tx.executeSql('INSERT INTO '+tableName+' ('+_key+') VALUES ('+_value+')',[],function (tx, result) { callback(result.rowsAffected); //console.log('添加成功'+result.rowsAffected); },function (tx, error) { console.error('添加失败'); callback(false); }); } _key = keyI = keyC = null; callback(); }); } return this; }, update : function(tableName,key,value,obj,callback){//更新指定数据 /* @param tableName 表名 @param key 查询的键 @param value 对应键的值 @param obj 更新的数据 {key1：value1 , key2 : value2 ...} @param callback 回调 传递参数为真则查询成功 反之更新失败 */ callback = this.isFunction(callback) ? callback : new Function(); var _db = this.database, _value = this.splitU(obj); _db.transaction(function (tx) { //console.log('sql:' + 'UPDATE ' + tableName + ' set ' + _value + ' where ' + key + '="' + value + '"') tx.executeSql('UPDATE '+tableName+' set '+_value+' where '+key+'="'+value+'"',[],function (tx, result) { callback(result.rowsAffected); },function (tx, error) { console.error('更新失败'); callback(false); }); }); return this; }, updateWhere: function (tableName, where, obj, callback) {//更新指定数据 /* @param tableName 表名 @param 查询条件 @param obj 更新的数据 {key1：value1 , key2 : value2 ...} @param callback 回调 传递参数为真则查询成功 反之更新失败 */ callback = this.isFunction(callback) ? callback : new Function(); var _db = this.database, _value = this.splitU(obj); _db.transaction(function (tx) { console.log('UPDATE ' + tableName + ' set ' + _value + ' where ' + where + '"') tx.executeSql('UPDATE ' + tableName + ' set ' + _value + ' where ' + where + '"', [], function (tx, result) { callback(result.rowsAffected); }, function (tx, error) { console.error('更新失败'); callback(false); }); }); return this; }, read : function(tableName,condition,callback){ //读取表数据 /* @param tableName 表名 @param condition 查询条件 'where' @param callback 回调 传递参数为真则查询成功 反之查询失败 */ var _condition = this.isString(condition) ? condition : ''; var _callback = this.isFunction(condition) ? condition : this.isFunction(callback) ? callback : new Function; var _db = this.database, _me = this, _re = []; _db.transaction(function (tx) { tx.executeSql('SELECT * FROM ' + tableName + ' ' + _condition + ' ', [], function (tx, results) { if(results && results.rows){ _re =_me.toArray(results.rows); _callback(_re); }else{ _callback([]); } },function(tx,error){ _callback([]); console.error('查询失败'); }); }); return this; }, remove:function(tableName,condition,callback){//删除数据 /* @param tableName 表名 @param condition 查询条件 'where' @param callback 回调 传递参数为真则删除成功 反之删除失败 */ var _me = this; var _condition = this.isString(condition) ? condition : ''; var _callback = this.isFunction(condition) ? condition : this.isFunction(callback) ? callback : new Function; _me.database.transaction(function (tx) { tx.executeSql('DELETE FROM '+tableName+ ' '+ _condition+' ',[],function (tx, result) { _callback(result.rowsAffected); },function (tx, error) { _callback(false); console.error('删除失败'); }); }); }, counts: function (tableName, condition, callback) { //读取表数据 /* @param tableName 表名 @param condition 查询条件 'where' @param callback 回调 传递参数为真则查询成功 反之查询失败 */ var _condition = this.isString(condition) ? condition : ''; var _callback = this.isFunction(condition) ? condition : this.isFunction(callback) ? callback : new Function; var _db = this.database, _me = this, _re = []; if (mui.os.ios) { //ios下面特有的 _db.transaction(function (tx) { tx.executeSql('SELECT NO FROM ' + tableName + ' ' + _condition + ' ', [], function (tx, results) {// count (*) as num if (results && results.rows) { _re = _me.toArray(results.rows); _callback(_re.length); } else { _callback(0); } }, function (tx, error) { _callback(0); console.error('查询失败'); }); }); } else { _db.transaction(function (tx) { tx.executeSql('SELECT count (*) as num FROM ' + tableName + ' ' + _condition + ' ', [], function (tx, results) {// count (*) as num if (results && results.rows) { if (results.rows[0]) { _callback(results.rows[0].num); } else { _callback(0); } } else { _callback(0); } }, function (tx, error) { _callback(0); console.error('查询失败'); }); }); } return this; }, delTable:function(tableName,callback){ //删除数据表 callback = this.isFunction(callback) ? callback : new Function(); this.database.transaction(function(tx){ tx.executeSql('DROP TABLE IF EXISTS '+tableName,[],function(tx,res){ callback(); },function(tx,err){ console.error(err); }); }); return this; }, splitU: function(obj){//更新字符处理 var _arr = []; for(var t in obj){ _arr.push(t+'="'+obj[t]+'"'); } return _arr.join(','); }, split : function(obj){//添加字符处理 var _arr = []; for(var m in obj){ _arr.push("'"+obj[m]+"'"); } return _arr.join(','); }, isFunction : function(callback){ return typeof callback != 'undefined' && callback.constructor == Function ? true : false }, isString : function(string){ return typeof string == 'string' ? true : false }, toArray : function(obj){ var _arr = [], _len = obj.length; if(_len > 0){ for (var i = 0; i < _len; i++) { _arr.push(obj.item(i)); }; } return _arr; } } win.smpWebSql = smpWebSql; }(window))