| 
 | 1 | +---  | 
 | 2 | +title: "Clients and Dialects"  | 
 | 3 | +description: "The LinkedQL clients and dialects"  | 
 | 4 | +permalink: /entry/clients/  | 
 | 5 | +nav_order: 4  | 
 | 6 | +layout: page  | 
 | 7 | +---  | 
 | 8 | + | 
 | 9 | +# Dialects & Clients  | 
 | 10 | + | 
 | 11 | +LinkedQL ships with clients for each major SQL dialect.  | 
 | 12 | + | 
 | 13 | +Each LinkedQL client extends its respective native connector and accepts the same initialization options.  | 
 | 14 | +The PostgreSQL, MySQL, and MariaDB clients integrate directly with their native drivers, while **FlashQL** provides an in-memory SQL engine that speaks both dialects.  | 
 | 15 | + | 
 | 16 | +---  | 
 | 17 | + | 
 | 18 | +## `1.1 |` PostgreSQL  | 
 | 19 | + | 
 | 20 | +Use as a drop-in replacement for [`node-postgres`](https://www.npmjs.com/package/pg).<br>  | 
 | 21 | +Speaks native **PostgreSQL**.  | 
 | 22 | + | 
 | 23 | +```js  | 
 | 24 | +import { PGClient } from '@linked-db/linked-ql/pg';  | 
 | 25 | + | 
 | 26 | +const client = new PGClient({  | 
 | 27 | +  host: 'localhost',  | 
 | 28 | +  port: 5432,  | 
 | 29 | +  user: 'postgres',  | 
 | 30 | +  password: 'password',  | 
 | 31 | +  database: 'mydb',  | 
 | 32 | +  poolMode: false // defaults to pg.Client  | 
 | 33 | +});  | 
 | 34 | +await client.connect();  | 
 | 35 | + | 
 | 36 | +const res = await client.query('SELECT 1::text AS result');  | 
 | 37 | +console.log(res.rows); // [{ result: '1' }]  | 
 | 38 | + | 
 | 39 | +await client.disconnect();  | 
 | 40 | +```  | 
 | 41 | + | 
 | 42 | +### `1.1.1 |` Client Options  | 
 | 43 | + | 
 | 44 | +`PGClient` accepts all options supported by `node-postgres`.  | 
 | 45 | + | 
 | 46 | +Additional options:  | 
 | 47 | + | 
 | 48 | +* **`poolMode`** (*Default*: `false`) — whether to connect over `pg.Pool` or `pg.Client`.  | 
 | 49 | + | 
 | 50 | +### `1.1.2 |` Realtime Setup  | 
 | 51 | + | 
 | 52 | +To enable **live queries**, ensure [logical replication](https://www.postgresql.org/docs/current/view-pg-replication-slots.html) is enabled on your database.  | 
 | 53 | + | 
 | 54 | +Optionally specify the following to adapt LinkedQL to your setup:  | 
 | 55 | + | 
 | 56 | +* **`walSlotName`** — (*Default*: `'linkedql_default_slot'`) replication slot name.  | 
 | 57 | +* **`walSlotPersistence`** — slot lifecycle management:<br>  | 
 | 58 | +  `0` = ephemeral, DB-managed · `1` = ephemeral, LinkedQL-managed · `2` = persistent, external management implied.  | 
 | 59 | +* **`pgPublications`** — (*Default*: `'linkedql_default_publication'`) publication name(s) to listen on.  | 
 | 60 | + | 
 | 61 | +---  | 
 | 62 | + | 
 | 63 | +## `1.2 |` MySQL  | 
 | 64 | + | 
 | 65 | +Use in place of [`mysql2`](https://www.npmjs.com/package/mysql2).  | 
 | 66 | +Speaks native **MySQL**.  | 
 | 67 | + | 
 | 68 | +```js  | 
 | 69 | +import { MySQLClient } from '@linked-db/linked-ql/mysql';  | 
 | 70 | + | 
 | 71 | +const client = new MySQLClient({  | 
 | 72 | +  host: 'localhost',  | 
 | 73 | +  port: 3306,  | 
 | 74 | +  user: 'root',  | 
 | 75 | +  password: 'password',  | 
 | 76 | +  database: 'mydb',  | 
 | 77 | +  poolMode: false // defaults to mysql.createConnection()  | 
 | 78 | +});  | 
 | 79 | +await client.connect();  | 
 | 80 | + | 
 | 81 | +const res = await client.query('SELECT 1 AS `result`');  | 
 | 82 | +console.log(res.rows); // [{ result: 1 }]  | 
 | 83 | + | 
 | 84 | +await client.disconnect();  | 
 | 85 | +```  | 
 | 86 | + | 
 | 87 | +### `1.2.1 |` Client Options  | 
 | 88 | + | 
 | 89 | +`MySQLClient` accepts all connection options supported by `mysql2`.  | 
 | 90 | + | 
 | 91 | +Additional options:  | 
 | 92 | + | 
 | 93 | +* **`poolMode`** (*Default*: `false`) — whether to connect over `mysql.createPool()` or `mysql.createConnection()`.  | 
 | 94 | + | 
 | 95 | +### `1.2.2 |` Realtime Setup  | 
 | 96 | + | 
 | 97 | +Realtime capabilities for MySQL are **coming soon**.  | 
 | 98 | + | 
 | 99 | +---  | 
 | 100 | + | 
 | 101 | +## `1.3 |` MariaDB  | 
 | 102 | + | 
 | 103 | +Use in place of [`mariadb`](https://www.npmjs.com/package/mariadb`).<br>  | 
 | 104 | +Speaks native **MariaDB / MySQL**.  | 
 | 105 | + | 
 | 106 | +```js  | 
 | 107 | +import { MariaDBClient } from '@linked-db/linked-ql/mariadb';  | 
 | 108 | + | 
 | 109 | +const client = new MariaDBClient({  | 
 | 110 | +  host: 'localhost',  | 
 | 111 | +  port: 3306,  | 
 | 112 | +  user: 'root',  | 
 | 113 | +  password: 'password',  | 
 | 114 | +  database: 'mydb'  | 
 | 115 | +});  | 
 | 116 | +await client.connect();  | 
 | 117 | + | 
 | 118 | +const res = await client.query('SELECT 1 AS `result`');  | 
 | 119 | +console.log(res.rows); // [{ result: 1 }]  | 
 | 120 | + | 
 | 121 | +await client.disconnect();  | 
 | 122 | +```  | 
 | 123 | + | 
 | 124 | +### `1.3.1 |` Client Options  | 
 | 125 | + | 
 | 126 | +`MariaDBClient` accepts all connection options supported by the native `mariadb` driver.<br>  | 
 | 127 | +It always runs on a connection pool.  | 
 | 128 | + | 
 | 129 | +### `1.3.2 |` Realtime Setup  | 
 | 130 | + | 
 | 131 | +Realtime support for MariaDB is **coming soon**.  | 
 | 132 | + | 
 | 133 | +---  | 
 | 134 | + | 
 | 135 | +## `1.4 |` FlashQL  | 
 | 136 | + | 
 | 137 | +Use as an in-memory alternative to [`SQLite`](https://sqlite.org/) or [`PGLite`](https://pglite.dev/).  | 
 | 138 | +Speaks both **PostgreSQL** and **MySQL** dialects.  | 
 | 139 | + | 
 | 140 | +```js  | 
 | 141 | +import { FlashClient } from '@linked-db/linked-ql/flash';  | 
 | 142 | + | 
 | 143 | +const client = new FlashClient();  | 
 | 144 | +await client.connect();  | 
 | 145 | + | 
 | 146 | +// PostgreSQL syntax (default dialect)  | 
 | 147 | +const pgRes = await client.query('SELECT 1::text AS result');  | 
 | 148 | +console.log(pgRes.rows); // [{ result: '1' }]  | 
 | 149 | + | 
 | 150 | +// MySQL syntax (explicit dialect)  | 
 | 151 | +const myRes = await client.query('SELECT 1 AS `result`', { dialect: 'mysql' });  | 
 | 152 | +console.log(myRes.rows); // [{ result: 1 }]  | 
 | 153 | + | 
 | 154 | +await client.disconnect();  | 
 | 155 | +```  | 
 | 156 | + | 
 | 157 | +### `1.4.1 |` Realtime Setup  | 
 | 158 | + | 
 | 159 | +Realtime capabilities are built in.  | 
 | 160 | +No configuration required — FlashQL automatically emits and processes change events internally.  | 
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