初始化websql数据库的参数信息
var config = {
name: 'my_plan',
version: '',
desc: 'manage my plans',
size: 20 * 1024
};
7 var db = window.openDatabase(config.name, config.version, config.desc, config.size);此函数为创建一个表
function crateTable() {
var sql = 'create table if not exists t_plan(title, content, target_time, create_time)';
db.transaction(function(tx) {
tx.executeSql(sql, null, function(tx, rs) {
console.log('执行sql成功');
}, errorCallback);
});
}接下来往表里增加一条数据
function addPlan(values) {
var sql = 'INSERT INTO t_plan (title, content, target_time, create_time) VALUES (?,?,?,?)';
db.transaction(function(tx) {
tx.executeSql(sql, values, function(tx, rs) {
var effectRow = rs.rowsAffected;
console.log('影响记录条数:' + effectRow);
effectRow && console.log('执行sql成功');
}, errorCallback);
});
}查询所以记录代码
function getPlanList() {
var sql = 'SELECT * FROM t_plan';
db.transaction(function(tx) {
tx.executeSql(sql, null, function(tx, rs) {
console.log('list:' + rs.rows);
console.log('item:' + JSON.stringify(rs.rows.item(0)));
}, errorCallback);
});
9 };删除一条记录
function deletePlan(values) {
var sql = 'DELETE FROM t_plan WHERE title = ?';
db.transaction(function(tx) {
tx.executeSql(sql, values, function(tx, rs) {
var effectRow = rs.rowsAffected;
console.log('影响记录条数:' + effectRow);
effectRow && console.log('执行sql成功');
}, errorCallback);
});
}修改一条记录
function updatePlan(values) {
var sql = 'UPDATE t_plan SET content = ? WHERE title = ?';
db.transaction(function(tx) {
tx.executeSql(sql, values, function(tx, rs) {
var effectRow = rs.rowsAffected;
console.log('影响记录条数:' + effectRow);
effectRow && console.log('执行sql成功');
}, errorCallback);
});
}下面附上源码：
<!DOCTYPE html>
<html> <head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<title></title>
<style type="text/css">
input {
display: block;
}
</style>
</head> <body>
<input type="text" id="title" />
<input type="text" id="content" />
<input type="text" id="target_time" />
<button type="button" id="add_plan">add</button>
<button type="button" id="select">select</button>
<script type="text/javascript">
// (function() {
document.getElementById("add_plan").addEventListener('click', function() {
var title = document.getElementById("title").value;
var content = document.getElementById("content").value;
var targetTime = document.getElementById("target_time").value;
var createTime = new Date().getTime(); var values = [title, content, targetTime, createTime];
addPlan(values);
});
document.getElementById("select").addEventListener('click', function() {
getPlanList();
});
// 判定当前环境是否支持websql
// if(!window.openDatabase) {
// console.log('当前环境不支持websql');
// return;
// } var config = { //初始化websql数据库的参数信息
name: 'my_plan',
version: '',
desc: 'manage my plans',
size: 20 * 1024
};
var db = window.openDatabase(config.name, config.version, config.desc, config.size); crateTable(db); function errorCallback(error) {
console.error('error:' + error.message);
} function crateTable() {
var sql = 'create table if not exists t_plan(title, content, target_time, create_time)';
db.transaction(function(tx) {
tx.executeSql(sql, null, function(tx, rs) {
console.log('执行sql成功');
}, errorCallback);
});
} function addPlan(values) {
var sql = 'INSERT INTO t_plan (title, content, target_time, create_time) VALUES (?,?,?,?)';
db.transaction(function(tx) {
tx.executeSql(sql, values, function(tx, rs) {
var effectRow = rs.rowsAffected;
console.log('影响记录条数:' + effectRow);
effectRow && console.log('执行sql成功');
}, errorCallback);
});
} function getPlanList() {
var sql = 'SELECT * FROM t_plan';
db.transaction(function(tx) {
tx.executeSql(sql, null, function(tx, rs) {
console.log('list:' + rs.rows);
console.log('item:' + JSON.stringify(rs.rows.item(0)));
}, errorCallback);
});
}; function deletePlan(values) {
var sql = 'DELETE FROM t_plan WHERE title = ?';
db.transaction(function(tx) {
tx.executeSql(sql, values, function(tx, rs) {
var effectRow = rs.rowsAffected;
console.log('影响记录条数:' + effectRow);
effectRow && console.log('执行sql成功');
}, errorCallback);
});
} function updatePlan(values) {
var sql = 'UPDATE t_plan SET content = ? WHERE title = ?';
db.transaction(function(tx) {
tx.executeSql(sql, values, function(tx, rs) {
var effectRow = rs.rowsAffected;
console.log('影响记录条数:' + effectRow);
effectRow && console.log('执行sql成功');
}, errorCallback);
});
}
// }());
</script>
</body> </html>