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index03.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>web sql</title>
</head>
<body>
<script>
var webSql = function (dbname) {
var db = openDatabase(dbname, '1.0.0','', 20 * 1024 * 1024);
return {
/**
* 返回数据库名
*/
getDBName: function () {
return dbname;
},
/**
* 初始化数据库，如果需要则创建表
*/
init: function (tableName, colums) {
this.switchTable(tableName);
colums.length > 0 ? this.createTable(colums) : '';
return this;
},
/**
* 创建表
* colums:[name:字段名,type:字段类型]
*/
createTable:function(colums) {
var sql = "CREATE TABLE IF NOT EXISTS " + this._table, t;
if (colums instanceof Array && colums.length > 0) {
t = [];
for (var i in colums) {
t.push(colums[i].name + ' ' + colums[i].type);
}
t = t.join(', ');
} else if (typeof colums == "object"){
t += colums.name+' '+colums.type;
}
sql = sql + " (" + t + ")";
var that = this;
db.transaction(function(t) {
// 执行真实的SQL查询
t.executeSql(sql);
})
},
/**
* 切换表
*/
switchTable: function (tableName) {
this._table = tableName;
return this;
},
/**
* 插入数据并执行回调函数，支持批量插入
* @param data Array类型 每一组值均为Object类型，每一个Obejct的属性应为表的字段名，对应要保存的值
* @param callback 回调函数
* @returns {boolean}
*/
insertData: function(data, callback) {
var that = this;
var sql = "INSERT INTO " + this._table;
if (data instanceof Array && data.length > 0) {
var cols = [], qs = [];
for (var i in data[0]) {
cols.push(i);
qs.push('?');
}
sql += " ("+cols.join(',')+") Values ("+qs.join(',')+")";
} else {
return false;
}
var p = [], d = data, pLenth = 0, r = [];
for (var i = 0, dLength = d.length; i < dLength; i++) {
var k = [];
for (var j in d[i]) {
k.push(d[i][j]);
}
p.push(k);
}
var tx;
var queue = function(b, result) {
if (result){
r.push(result.insertId || result.rowsAffected);
}
if (p.length > 0) {
tx.executeSql(sql, p.shift(), queue, that.onfail);
} else {
callback && callback.call(this,r);
}
};
// 根据情况控制事务提交或回滚
db.transaction(function(t) {
tx = t;
queue();
});
},
/**
* where语句，支持自写和以对象属性值对的形式
* @param where
* @returns {webSql}
*/
where: function(where) {
if (typeof where === 'object') {
var j = this.toArray(where);
this._where = j.join(' and ');
} else if (typeof where === 'string') {
this._where = where;
}
return this;
},
/**
* 更新数据，data为属性值对形式
* @param data
* @param callback
*/
updateData: function(data, callback) {
var that = this;
var sql = "UPDATE " + this._table;
data = this.toArray(data).join(',');
sql += " SET " + data + " WHERE " + this._where;
this.doQuery(sql, callback);
},
/**
* 根据条件保存数据，如果存在则更新，不存在则插入数据
* @param data
* @param callback
*/
saveData: function(data, callback) {
var sql = "SELECT * FROM " + this._table + " WHERE " + this._where;
var that = this;
this.doQuery(sql, function(r) {
if (r.length > 0) {
that.updateData(data, callback);
} else {
that.insertData([data], callback);
}
});
},
/**
* 获取数据
* @param callback
*/
getData: function (callback) {
var that = this;
var sql = "SELECT * FROM " + that._table;
that._where.length > 0 ? sql += " WHERE " + that._where : "";
that.doQuery(sql, callback);
},
/**
* 查询， 内部方法
* @param sql
* @param callback
*/
doQuery: function (sql, callback) {
var that = this;
var a = [];
var bb = function (b, result) {
if (result.rows.length) {
for (var i = 0; i < result.rows.length; i++) {
a.push(result.rows.item(i));
}
} else {
a.push(result.rowsAffected);
}
callback && callback.call(that, a);
};
db.transaction(function (t) {
t.executeSql(sql, [], bb, that.onfail);
});
},
/**
* 根据条件删除数据
* @param callback
*/
deleteData: function (callback) {
var that = this;
var sql = "DELETE FROM " + that._table;
that._where.length > 0 ? sql += " WHERE " + that._where : '';
that.doQuery(sql);
},
/**
* 删除表
*/
dropTable: function () {
var sql = "DROP TABLE IF EXISTS " + this._table;
this.doQuery(sql);
},
_where: '',
_error: '',
/**
*
* @param t
* @param e
*/
onfail: function (t, e) {
this._error = e.message;
console.log('------sqlite:' + e.message);
},
/**
*
* @param obj
* @returns {Array}
*/
toArray: function (obj) {
var t = [];
obj = obj || {};
if (obj) {
for (var i in obj) {
t.push(i + "='" + obj[i] + "'");
}
}
return t;
}
};
};
var db = new webSql('testDB');
db.init('channel_list',[
{name:'id',type:'integer primary key autoincrement'},
{name:'name',type:'text'},
{name:'link',type:'text'},
{name:'cover',type:'text'},
{name:'updatetime',type:'integer'},
{name:'orders',type:'integer'}
]);
/*
db.init('feed_list',[
{name:'parentid',type:'integer'},
{name:'feed',type:'text'}
]);
*/
db.switchTable('channel_list').insertData([
{name:'aa', link:'htttp://www.john_3.com', cover:'张桓', updatetime: new Date().getTime(), orders:1},
{name:'bb', link:'yz30.com@aliyun.com', cover:'桓桓', updatetime: new Date().getTime(), orders:2},
]);
db.where({name:'aa'}).getData(function(result){
console.log(result);//result为Array
});
/*
db.where({name:'cc'}).deleteData(function(result){
console.log("删除条数:"+result[0]);//删除条数
});
db.where({name:'aa'}).saveData({link:'asdfasdfasdf'},function(result){
console.log(result);//影响条数
});
*/
</script>
</body>
</html>