Database

Database abstraction layer for D programing language, support PostgreSQL / MySQL.

Example

import std.stdio;

import hunt.database;

void main()
{
    writeln("run database MySQL demo.");

    auto db = new Database("mysql://root:123456@localhost:3306/test?charset=utf8mb4");

    int result = db.execute(`INSERT INTO user(username) VALUES("test")`);
    writeln(result);

    foreach(row; db.query("SELECT * FROM user LIMIT 10"))
    {
        writeln(row["username"]);
    }

    db.close();
}

Use DatabaseOption to instantiate a Database object

auto options = new DatabaseOption("mysql://root:123456@localhost:3306/test");
options.setMaximumConnection(5);

auto db = new Database(options);

db.execute("SET NAMES utf8");

API

• int Database.execute(string sql) Return number of execute result.

int result = db.execute('INSERT INTO user(username) VALUES("Brian")');
// if execute error ,db will throw an DatabaseException

• RowSet Database.query(sql) Return RowSet object for query(SELECT).

RowSet rs = db.query("SELECT * FROM user LIMIT 10");

• Statement Database.prepare(sql) Create a prepared Statement object.

Statement stmt = db.prepare("SELECT * FROM user where username = :username and age = :age LIMIT 10");

• Statement.setParameter(param, value) : bind param's value to :param for sql.

stmt.setParameter("username", "viile");
stmt.setParameter("age", 18);

• RowSet Statement.query() Return RowSet

RowSet rs = stmt.query();
foreach(row; rs)
{
    writeln(row["username"]);
}

• Row Statement.fetch() Return Row

Row row = stmt.fetch();
writeln(row["username"]);

• int Statement.execute() : return execute status for prepared Statement object.

int result = stmt.execute();

• Statement.lastInsertId() : Statement.execute() for insert sql, return lastInsertId.

See also

• https://github.com/eclipse-vertx/vertx-sql-client