DbalD 语言数据库驱动层
Dbal 是 HuntLabs 开发的D语言(dlang)数据库驱动层,类似 PHP 的 PDO、JAVA 的 JDBC,内置连接池支持。
目前支持的数据库驱动:
PostgreSQL 8+
MySQL 5.1+
SQLite 3+
示例代码
import std.stdio; import std.experimental.logger; import database; void main() { writeln("run database MySQL demo."); auto db = new Database("mysql://root:123456@localhost:3306/test?charset=utf-8"); 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
ResultSet Database.query(sql) Return ResultSet object for query(SELECT).
ResultSet 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);
ResultSet Statement.query() Return ResultSet
ResultSet 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.