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const std = @import("std");
const assert = std.debug.assert;
const c = @cImport({
@cInclude("duckdb.h");
});
const Result = @import("Result.zig").Result;
const PreparedStatement = @import("PreparedStatement.zig");
const Connection = struct {
_conn: c.duckdb_connection,
pub fn init(db: Database) !Connection {
var conn: Connection = undefined;
if( c.duckdb_connect(db._db, &conn._conn) == c.DuckDBError ){
return error.DuckDBError;
}
return conn;
}
pub fn deinit(self: *Connection) void {
c.duckdb_disconnect(&self._conn);
}
/// Query returning a result. Caller needs to call result.deinit()
pub fn query(self: *Connection, q: [:0]const u8, comptime res_type: type)
!Result(res_type) {
var result: c.duckdb_result = undefined;
const state = c.duckdb_query(self._conn, q, &result);
if ( state == c.DuckDBError ){
return error.DuckDBError;
}
return try Result(res_type).init(result);
}
/// Query with no results and autoclean
pub fn run(self: *Connection, q: [:0]const u8) !void{
var x = try self.query(q, void);
defer x.deinit();
}
/// Make a prepared query. Caller needs to call prepared_query.deinit()
pub fn prepareStatement(self: *Connection, q: [:0]const u8)
!PreparedStatement {
var stmt: c.duckdb_prepared_statement = undefined;
const state = c.duckdb_prepare(self._conn, q, &stmt);
if ( state == c.DuckDBError ){
return error.DuckDBError;
}
return PreparedStatement.init(stmt);
}
};
pub const Database = @This();
_db: c.duckdb_database,
pub fn init(file: [*c]const u8) !Database{
var db : Database = undefined;
if (c.duckdb_open(file, &db._db) == c.DuckDBError) {
return error.DuckDBError;
}
return db;
}
pub fn deinit(self: *Database) void{
c.duckdb_close(&self._db);
}
pub fn connect(self: Database) !Connection {
return Connection.init(self);
}
test "Open and connect" {
var database = try Database.init(":memory:");
defer database.deinit();
var connection = try database.connect();
defer connection.deinit();
}
test "Simple querying" {
var database = try Database.init(":memory:");
defer database.deinit();
var connection = try database.connect();
defer connection.deinit();
const s : type = comptime struct {
primer: i32, // This is safe because the first column is NOT NULL
segund: ?i32
};
try connection.run("CREATE TABLE integers (i INTEGER NOT NULL, j INTEGER);");
try connection.run("INSERT INTO integers VALUES (3, 4), (5, 6), (7, NULL);");
var result = try connection.query("SELECT * FROM integers;", s);
defer result.deinit();
try std.testing.expect(2 == result.getColumnCount());
var z = try result.next();
try std.testing.expect(z.primer == 3);
try std.testing.expect(z.segund.? == 4);
z = try result.next();
try std.testing.expect(z.primer == 5);
try std.testing.expect(z.segund.? == 6);
z = try result.next();
try std.testing.expect(z.primer == 7);
try std.testing.expect(z.segund == null);
}
test "Checks if all fields are captured" {
var database = try Database.init(":memory:");
defer database.deinit();
var connection = try database.connect();
defer connection.deinit();
const s : type = comptime struct {
primer: ?i32,
segund: ?i32,
tercer: ?i32,
};
try connection.run("CREATE TABLE integers (i INTEGER NOT NULL, j INTEGER);");
try connection.run("INSERT INTO integers VALUES (3, 4), (5, 6), (7, NULL);");
try std.testing.expectError(error.QueryColumnCountCapture,
connection.query("SELECT * FROM integers;", s));
}
test "String queries" {
var database = try Database.init(":memory:");
defer database.deinit();
var connection = try database.connect();
defer connection.deinit();
const s : type = comptime struct {
primer: []const u8
};
try connection.run("CREATE TABLE text (i VARCHAR NOT NULL );");
try connection.run("INSERT INTO text VALUES ('Inlined');");
try connection.run("INSERT INTO text VALUES ('A very long string that is not inlined');");
var result = try connection.query("SELECT * FROM text;", s);
defer result.deinit();
try std.testing.expect(1 == result.getColumnCount());
var w = try result.next();
try std.testing.expect(std.mem.eql(u8, w.primer, "Inlined"));
w = try result.next();
try std.testing.expect(std.mem.eql(u8, w.primer, "A very long string that is not inlined"));
}
test "Prepared queries" {
var database = try Database.init(":memory:");
defer database.deinit();
var connection = try database.connect();
defer connection.deinit();
try connection.run("CREATE TABLE ints (i INTEGER NOT NULL );");
var prepared = try connection.prepareStatement("INSERT INTO ints VALUES (?), (?);");
defer prepared.deinit();
const uno: i32 = 1;
const dos: i32 = 2;
try prepared.bindAll(.{uno, dos});
var res = try prepared.exec(void);
res.deinit();
const s: type = struct {
primer: i32,
};
var result = try connection.query("SELECT * FROM ints;", s);
defer result.deinit();
var r = try result.next();
try std.testing.expect(r.primer == uno);
r = try result.next();
try std.testing.expect(r.primer == dos);
}
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