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sql-servant.html
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sql-servant.html
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<!DOCTYPE html>
<html>
<head>
<title>SQL Servant</title>
<style type="text/css">
* {
box-sizing: border-box;
}
body {
font-family: sans-serif;
}
h1 {
text-align: center;
margin: 1em 0;
}
h2 {
clear: both;
visibility: hidden;
height: 0;
margin: 0;
}
textarea {
width: 60%;
display: block;
margin: 0 auto;
font-family: monospace;
height: 10em;
font-size: 1.2em;
}
fieldset textarea {
width: 90%;
}
fieldset {
width: 48%;
display: block;
float: left;
padding: 0;
border: none;
}
legend {
padding: 2em 0 0.5em 0;
width: 100%;
text-align: center;
}
.instructions {
font-style: italic;
text-align: center;
}
</style>
</head>
<body>
<h1>SQL Servant</h1>
<form>
<p class="instructions">Enter your data below. I'll do the rest.</p>
<h2>Output</h2>
<textarea id="input">
table_name
key1 = 1
key2 = '2'
--
column1 = 'A'
column2 = 'B'
--
optional = 'default value'
dontUpdate = 'if it already exists'
</textarea>
<h2>Output</h2>
<fieldset>
<legend>Merge</legend>
<textarea id="merge-code"></textarea>
</fieldset>
<fieldset>
<legend>Insert</legend>
<textarea id="insert-code"></textarea>
</fieldset>
<fieldset>
<legend>Update</legend>
<textarea id="update-code"></textarea>
</fieldset>
<fieldset>
<legend>Delete</legend>
<textarea id="delete-code"></textarea>
</fieldset>
</form>
<script type="text/javascript">
var each = function(obj, iterator, context) {
if (obj == null) return;
for (var i = 0, length = obj.length; i < length; i++) {
iterator.call(context, obj[i], i, obj);
}
};
var map = function(obj, iterator, context) {
var results = [];
if (obj == null) return results;
each(obj, function(value, index, list) {
results.push(iterator.call(context, value, index, list));
});
return results;
};
var SqlServant = function () {
var tableName = "SOME_TABLE";
var keyColumnNames = [];
var keyColumnValues = [];
var columnNames = [];
var columnValues = [];
var optionalColumnNames = [];
var optionalColumnValues = [];
var trim = function (s) {
return s.replace(/^\s+|\s+$/g, '');
};
var listOfPairs = function (keys, values, pairDelimiter, delimiter) {
var lines = [];
for (var i = 0; i < keys.length; i++) {
lines.push(keys[i] + pairDelimiter + values[i]);
}
return lines.join(delimiter || '');
};
var equalsPairList = function (keys, values, delimiter) {
return listOfPairs(keys, values, ' = ', delimiter);
}
var allColumnNames = function () {
return keyColumnNames.concat(columnNames, optionalColumnNames);
};
var allColumnValues = function () {
return keyColumnValues.concat(columnValues, optionalColumnValues);
};
var prefixAll = function (obj, prefix) {
return map(obj, function (item) {
return prefix + item;
})
}
var addTerminator = function (s) {
return s + ';';
}
return {
setTableName: function (t) {
tableName = t;
},
addKeyColumn: function (k, v) {
keyColumnNames.push(trim(k));
keyColumnValues.push(trim(v));
},
addColumn: function (k, v) {
columnNames.push(trim(k));
columnValues.push(trim(v));
},
addOptionalColumn: function (k, v) {
optionalColumnNames.push(trim(k));
optionalColumnValues.push(trim(v));
},
updateStatement: function () {
var lines = [];
if (!columnNames.length) return '/* nothing to update */';
lines.push('UPDATE ' + tableName);
lines.push('SET');
lines.push(equalsPairList(columnNames, columnValues, ',\n'));
lines.push('WHERE');
lines.push(equalsPairList(keyColumnNames, keyColumnValues, ' AND\n'));
return addTerminator(lines.join('\n'));
},
deleteStatement: function () {
var lines = [];
lines.push('DELETE FROM ' + tableName);
lines.push('WHERE');
lines.push(equalsPairList(keyColumnNames, keyColumnValues, ' AND\n'));
return addTerminator(lines.join('\n'));
},
insertStatement: function () {
return addTerminator('INSERT INTO ' + tableName + '(' + allColumnNames().join(', ') + ')\nVALUES (' + allColumnValues().join(', ')+ ')');
},
mergeStatement: function () {
var lines = [];
lines.push('MERGE INTO ' + tableName + ' A USING');
lines.push('(SELECT ');
lines.push(listOfPairs(allColumnValues(), allColumnNames(), ' AS ' , ',\n'));
lines.push('FROM DUAL) B');
lines.push('ON (' + listOfPairs(prefixAll(keyColumnNames, 'A.'), prefixAll(keyColumnNames, 'B.'), ' = ', ' AND ') + ')');
lines.push('WHEN NOT MATCHED THEN');
lines.push('INSERT (' + allColumnNames().join(', ') + ')');
lines.push('VALUES (' + prefixAll(allColumnNames(), 'B.').join(', ') + ')');
if(columnNames.length) {
lines.push('WHEN MATCHED THEN');
lines.push('UPDATE SET');
lines.push(equalsPairList(prefixAll(columnNames, 'A.'), prefixAll(columnNames, 'B.'), ',\n'));
}
return addTerminator(lines.join('\n'));
}
}
};
var parse = function () {
var s = SqlServant();
var input = document.getElementById('input').value;
var inputLines = input.split('\n');
var tableName = inputLines[0];
s.setTableName(tableName);
var method = 'addKeyColumn'
for (var i = 1; i < inputLines.length; i++) {
if (inputLines[i].substring(0,1) === '-') {
method = (method === 'addKeyColumn') ? 'addColumn' : 'addOptionalColumn';
}
var pair = inputLines[i].split('=');
if (pair[0] && pair[1]) {
s[method](pair[0], pair[1]);
}
}
document.getElementById('update-code').value = s.updateStatement();
document.getElementById('insert-code').value = s.insertStatement();
document.getElementById('merge-code').value = s.mergeStatement();
document.getElementById('delete-code').value = s.deleteStatement();
}
if(!document.addEventListener) {
alert('Sorry, this browser\'s not supported. Use a modern browser (IE9+, Firefox, Chrome).')
}
document.getElementById('input').addEventListener('keyup', parse);
parse();
</script>
</body>
</html>