Basic usage

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David Ask edited this page Apr 7, 2016 · 7 revisions

Connecting to a database

Each library conforming to SQL implements its own method of connecting. In PostgreSQL it looks like this:

letconnection=Connection(host:"localhost", databaseName:"my_database")

Each driver should have a Connection constructor you can use to provide connection details.

Opening and closing a connection

Opening a connection is easy.

try connection.open()

Closing is usually not needed, as the connection will close automatically when there are no references to the connection class. You can, however, do it manually.

connection.close()

Executing raw queries

You can run queries simply by passing a String to the connections execute method.

try connection.execute("SELECT * FROM artists")

You can pass parameters to protect your queries from SQL injection.

try connection.execute("SELECT * FROM artists where id = %@", parameters:1)

Getting values from results

When executing queries, using the execute method, you will receive a Result object for your specific driver. The Result object is a CollectionType that may contain generator elements of Row, depending on your query.

forrowintry connection.execute("SELECT * FROM artists"){letname:String=try row.value("name")letdata=try row.data("name")}

When accessing values from a Row, you can either ask for a value or Data. When asking for a value, you need to explicitly declare the type of the value you are expecting, including if it's optional or not. This helps with the data integrity of your application, as Row will throw an error if it finds a null value where you've declared a non-optional type. Similarly, Row will throw an error if the field is not present in the result.

For example, this table has a non-null field called name, and a nullable field called genre.

CREATETABLEIF NOT EXISTS artists(
id SERIALPRIMARY KEY,
genre VARCHAR(50), # Note how this field is nullable
name VARCHAR(255) NOT NULL
)
// Will throw an error if genre is NULL
letgenre:String=try row.value("genre")
// Works as expected
letgenre:String?=try row.value("genre")
// Will throw an error. Field is missing
letiDontExist:String?=try row.value("something")

Clone this wiki locally

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
Basic usage
Jump to bottom

David Ask edited this page Apr 7, 2016
·
7 revisions
Connecting to a database
Each library conforming to SQL implements its own method of connecting. In PostgreSQL it looks like this:
letconnection=Connection(host:"localhost", databaseName:"my_database")
Each driver should have a Connection constructor you can use to provide connection details.
Opening and closing a connection
Opening a connection is easy.
try connection.open()
Closing is usually not needed, as the connection will close automatically when there are no references to the connection class. You can, however, do it manually.
connection.close()
Executing raw queries
You can run queries simply by passing a String to the connections execute method.
try connection.execute("SELECT * FROM artists")
You can pass parameters to protect your queries from SQL injection.
try connection.execute("SELECT * FROM artists where id = %@", parameters:1)
Getting values from results
When executing queries, using the execute method, you will receive a Result object for your specific driver.
The Result object is a CollectionType that may contain generator elements of Row, depending on your query.
forrowintry connection.execute("SELECT * FROM artists"){letname:String=try row.value("name")letdata=try row.data("name")}
When accessing values from a Row, you can either ask for a value or Data. When asking for a value, you need to explicitly declare the type of the value you are expecting, including if it's optional or not. This helps with the data integrity of your application, as Row will throw an error if it finds a null value where you've declared a non-optional type. Similarly, Row will throw an error if the field is not present in the result.
For example, this table has a non-null field called name, and a nullable field called genre.
CREATETABLEIF NOT EXISTS artists(
id SERIALPRIMARY KEY,
genre VARCHAR(50), # Note how this field is nullable
name VARCHAR(255) NOT NULL
)
// Will throw an error if genre is NULL
letgenre:String=try row.value("genre")
// Works as expected
letgenre:String?=try row.value("genre")
// Will throw an error. Field is missing
letiDontExist:String?=try row.value("something")
Clone this wiki locally

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Basic usage
Jump to bottom

David Ask edited this page Apr 7, 2016
·
7 revisions
Connecting to a database
Each library conforming to SQL implements its own method of connecting. In PostgreSQL it looks like this:
letconnection=Connection(host:"localhost", databaseName:"my_database")
Each driver should have a Connection constructor you can use to provide connection details.
Opening and closing a connection
Opening a connection is easy.
try connection.open()
Closing is usually not needed, as the connection will close automatically when there are no references to the connection class. You can, however, do it manually.
connection.close()
Executing raw queries
You can run queries simply by passing a String to the connections execute method.
try connection.execute("SELECT * FROM artists")
You can pass parameters to protect your queries from SQL injection.
try connection.execute("SELECT * FROM artists where id = %@", parameters:1)
Getting values from results
When executing queries, using the execute method, you will receive a Result object for your specific driver.
The Result object is a CollectionType that may contain generator elements of Row, depending on your query.
forrowintry connection.execute("SELECT * FROM artists"){letname:String=try row.value("name")letdata=try row.data("name")}
When accessing values from a Row, you can either ask for a value or Data. When asking for a value, you need to explicitly declare the type of the value you are expecting, including if it's optional or not. This helps with the data integrity of your application, as Row will throw an error if it finds a null value where you've declared a non-optional type. Similarly, Row will throw an error if the field is not present in the result.
For example, this table has a non-null field called name, and a nullable field called genre.
CREATETABLEIF NOT EXISTS artists(
id SERIALPRIMARY KEY,
genre VARCHAR(50), # Note how this field is nullable
name VARCHAR(255) NOT NULL
)
// Will throw an error if genre is NULL
letgenre:String=try row.value("genre")
// Works as expected
letgenre:String?=try row.value("genre")
// Will throw an error. Field is missing
letiDontExist:String?=try row.value("something")
Clone this wiki locally

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Basic usage
Jump to bottom

David Ask edited this page Apr 7, 2016
·
7 revisions
Connecting to a database
Each library conforming to SQL implements its own method of connecting. In PostgreSQL it looks like this:
letconnection=Connection(host:"localhost", databaseName:"my_database")
Each driver should have a Connection constructor you can use to provide connection details.
Opening and closing a connection
Opening a connection is easy.
try connection.open()
Closing is usually not needed, as the connection will close automatically when there are no references to the connection class. You can, however, do it manually.
connection.close()
Executing raw queries
You can run queries simply by passing a String to the connections execute method.
try connection.execute("SELECT * FROM artists")
You can pass parameters to protect your queries from SQL injection.
try connection.execute("SELECT * FROM artists where id = %@", parameters:1)
Getting values from results
When executing queries, using the execute method, you will receive a Result object for your specific driver.
The Result object is a CollectionType that may contain generator elements of Row, depending on your query.
forrowintry connection.execute("SELECT * FROM artists"){letname:String=try row.value("name")letdata=try row.data("name")}
When accessing values from a Row, you can either ask for a value or Data. When asking for a value, you need to explicitly declare the type of the value you are expecting, including if it's optional or not. This helps with the data integrity of your application, as Row will throw an error if it finds a null value where you've declared a non-optional type. Similarly, Row will throw an error if the field is not present in the result.
For example, this table has a non-null field called name, and a nullable field called genre.
CREATETABLEIF NOT EXISTS artists(
id SERIALPRIMARY KEY,
genre VARCHAR(50), # Note how this field is nullable
name VARCHAR(255) NOT NULL
)
// Will throw an error if genre is NULL
letgenre:String=try row.value("genre")
// Works as expected
letgenre:String?=try row.value("genre")
// Will throw an error. Field is missing
letiDontExist:String?=try row.value("something")
Clone this wiki locally

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
Basic usage
Jump to bottom

David Ask edited this page Apr 7, 2016
·
7 revisions
Connecting to a database
Each library conforming to SQL implements its own method of connecting. In PostgreSQL it looks like this:
letconnection=Connection(host:"localhost", databaseName:"my_database")
Each driver should have a Connection constructor you can use to provide connection details.
Opening and closing a connection
Opening a connection is easy.
try connection.open()
Closing is usually not needed, as the connection will close automatically when there are no references to the connection class. You can, however, do it manually.
connection.close()
Executing raw queries
You can run queries simply by passing a String to the connections execute method.
try connection.execute("SELECT * FROM artists")
You can pass parameters to protect your queries from SQL injection.
try connection.execute("SELECT * FROM artists where id = %@", parameters:1)
Getting values from results
When executing queries, using the execute method, you will receive a Result object for your specific driver.
The Result object is a CollectionType that may contain generator elements of Row, depending on your query.
forrowintry connection.execute("SELECT * FROM artists"){letname:String=try row.value("name")letdata=try row.data("name")}
When accessing values from a Row, you can either ask for a value or Data. When asking for a value, you need to explicitly declare the type of the value you are expecting, including if it's optional or not. This helps with the data integrity of your application, as Row will throw an error if it finds a null value where you've declared a non-optional type. Similarly, Row will throw an error if the field is not present in the result.
For example, this table has a non-null field called name, and a nullable field called genre.
CREATETABLEIF NOT EXISTS artists(
id SERIALPRIMARY KEY,
genre VARCHAR(50), # Note how this field is nullable
name VARCHAR(255) NOT NULL
)
// Will throw an error if genre is NULL
letgenre:String=try row.value("genre")
// Works as expected
letgenre:String?=try row.value("genre")
// Will throw an error. Field is missing
letiDontExist:String?=try row.value("something")
Clone this wiki locally

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Basic usage
Jump to bottom

David Ask edited this page Apr 7, 2016
·
7 revisions
Connecting to a database
Each library conforming to SQL implements its own method of connecting. In PostgreSQL it looks like this:
letconnection=Connection(host:"localhost", databaseName:"my_database")
Each driver should have a Connection constructor you can use to provide connection details.
Opening and closing a connection
Opening a connection is easy.
try connection.open()
Closing is usually not needed, as the connection will close automatically when there are no references to the connection class. You can, however, do it manually.
connection.close()
Executing raw queries
You can run queries simply by passing a String to the connections execute method.
try connection.execute("SELECT * FROM artists")
You can pass parameters to protect your queries from SQL injection.
try connection.execute("SELECT * FROM artists where id = %@", parameters:1)
Getting values from results
When executing queries, using the execute method, you will receive a Result object for your specific driver.
The Result object is a CollectionType that may contain generator elements of Row, depending on your query.
forrowintry connection.execute("SELECT * FROM artists"){letname:String=try row.value("name")letdata=try row.data("name")}
When accessing values from a Row, you can either ask for a value or Data. When asking for a value, you need to explicitly declare the type of the value you are expecting, including if it's optional or not. This helps with the data integrity of your application, as Row will throw an error if it finds a null value where you've declared a non-optional type. Similarly, Row will throw an error if the field is not present in the result.
For example, this table has a non-null field called name, and a nullable field called genre.
CREATETABLEIF NOT EXISTS artists(
id SERIALPRIMARY KEY,
genre VARCHAR(50), # Note how this field is nullable
name VARCHAR(255) NOT NULL
)
// Will throw an error if genre is NULL
letgenre:String=try row.value("genre")
// Works as expected
letgenre:String?=try row.value("genre")
// Will throw an error. Field is missing
letiDontExist:String?=try row.value("something")
Clone this wiki locally

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Basic usage
Jump to bottom

David Ask edited this page Apr 7, 2016
·
7 revisions
Connecting to a database
Each library conforming to SQL implements its own method of connecting. In PostgreSQL it looks like this:
letconnection=Connection(host:"localhost", databaseName:"my_database")
Each driver should have a Connection constructor you can use to provide connection details.
Opening and closing a connection
Opening a connection is easy.
try connection.open()
Closing is usually not needed, as the connection will close automatically when there are no references to the connection class. You can, however, do it manually.
connection.close()
Executing raw queries
You can run queries simply by passing a String to the connections execute method.
try connection.execute("SELECT * FROM artists")
You can pass parameters to protect your queries from SQL injection.
try connection.execute("SELECT * FROM artists where id = %@", parameters:1)
Getting values from results
When executing queries, using the execute method, you will receive a Result object for your specific driver.
The Result object is a CollectionType that may contain generator elements of Row, depending on your query.
forrowintry connection.execute("SELECT * FROM artists"){letname:String=try row.value("name")letdata=try row.data("name")}
When accessing values from a Row, you can either ask for a value or Data. When asking for a value, you need to explicitly declare the type of the value you are expecting, including if it's optional or not. This helps with the data integrity of your application, as Row will throw an error if it finds a null value where you've declared a non-optional type. Similarly, Row will throw an error if the field is not present in the result.
For example, this table has a non-null field called name, and a nullable field called genre.
CREATETABLEIF NOT EXISTS artists(
id SERIALPRIMARY KEY,
genre VARCHAR(50), # Note how this field is nullable
name VARCHAR(255) NOT NULL
)
// Will throw an error if genre is NULL
letgenre:String=try row.value("genre")
// Works as expected
letgenre:String?=try row.value("genre")
// Will throw an error. Field is missing
letiDontExist:String?=try row.value("something")
Clone this wiki locally

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
Basic usage
Jump to bottom

David Ask edited this page Apr 7, 2016
·
7 revisions
Connecting to a database
Each library conforming to SQL implements its own method of connecting. In PostgreSQL it looks like this:
letconnection=Connection(host:"localhost", databaseName:"my_database")
Each driver should have a Connection constructor you can use to provide connection details.
Opening and closing a connection
Opening a connection is easy.
try connection.open()
Closing is usually not needed, as the connection will close automatically when there are no references to the connection class. You can, however, do it manually.
connection.close()
Executing raw queries
You can run queries simply by passing a String to the connections execute method.
try connection.execute("SELECT * FROM artists")
You can pass parameters to protect your queries from SQL injection.
try connection.execute("SELECT * FROM artists where id = %@", parameters:1)
Getting values from results
When executing queries, using the execute method, you will receive a Result object for your specific driver.
The Result object is a CollectionType that may contain generator elements of Row, depending on your query.
forrowintry connection.execute("SELECT * FROM artists"){letname:String=try row.value("name")letdata=try row.data("name")}
When accessing values from a Row, you can either ask for a value or Data. When asking for a value, you need to explicitly declare the type of the value you are expecting, including if it's optional or not. This helps with the data integrity of your application, as Row will throw an error if it finds a null value where you've declared a non-optional type. Similarly, Row will throw an error if the field is not present in the result.
For example, this table has a non-null field called name, and a nullable field called genre.
CREATETABLEIF NOT EXISTS artists(
id SERIALPRIMARY KEY,
genre VARCHAR(50), # Note how this field is nullable
name VARCHAR(255) NOT NULL
)
// Will throw an error if genre is NULL
letgenre:String=try row.value("genre")
// Works as expected
letgenre:String?=try row.value("genre")
// Will throw an error. Field is missing
letiDontExist:String?=try row.value("something")
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