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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 Connection = @import("Connection.zig");
const PreparedStatement = @import("PreparedStatement.zig");
const Self = @This();
_db: c.duckdb_database,
/// Creates (opens) a new database that needs to call .deinit() later
pub fn init(file: [*c]const u8) !Self{
var db : Self = undefined;
if (c.duckdb_open(file, &db._db) == c.DuckDBError) {
return error.DuckDBError;
}
return db;
}
pub fn deinit(self: *Self) void{
c.duckdb_close(&self._db);
}
/// Returns a new Connection that needs to call .deinit() later
pub fn connect(self: Self) !Connection {
var conn: c.duckdb_connection = undefined;
if( c.duckdb_connect(self._db, &conn) == c.DuckDBError ){
return error.DuckDBError;
}
return Connection.init(conn);
}
test "Open and connect" {
var database = try Self.init(":memory:");
defer database.deinit();
var connection = try database.connect();
defer connection.deinit();
}
test "Simple querying" {
var database = try Self.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 "Simple querying with conversion" {
var database = try Self.init(":memory:");
defer database.deinit();
var connection = try database.connect();
defer connection.deinit();
const s : type = comptime struct {
primer: f64, // Converting to f64
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 == 3.0);
try std.testing.expect(z.segund.? == 4);
z = try result.next();
try std.testing.expect(z.primer == 5.0);
try std.testing.expect(z.segund.? == 6);
z = try result.next();
try std.testing.expect(z.primer == 7.0);
try std.testing.expect(z.segund == null);
}
test "All fields are captured" {
var database = try Self.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 Self.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 Self.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);
}
test "Prepared queries with strings" {
var database = try Self.init(":memory:");
defer database.deinit();
var connection = try database.connect();
defer connection.deinit();
try connection.run("CREATE TABLE ints (i STRING NOT NULL );");
var prepared = try connection.prepareStatement("INSERT INTO ints VALUES (?), (?);");
defer prepared.deinit();
const uno = "1";
const dos = "2";
try prepared.bindAll(.{uno, dos});
var res = try prepared.exec(void);
res.deinit();
const s: type = struct {
primer: []const u8,
};
var result = try connection.query("SELECT * FROM ints;", s);
defer result.deinit();
var w = try result.next();
try std.testing.expect(std.mem.eql(u8, w.primer, "1"));
w = try result.next();
try std.testing.expect(std.mem.eql(u8, w.primer, "2"));
}
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