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Introduce generic connectors and connections and use them in the queries.

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This commit is contained in:
Madeorsk 2024-10-22 14:09:02 +02:00
parent 0132ec282b
commit 7e31368fa3
Signed by: Madeorsk
GPG key ID: 677E51CA765BB79F
9 changed files with 195 additions and 54 deletions
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109
src/database.zig Normal file
View file

@ -0,0 +1,109 @@
const std = @import("std");
const pg = @import("pg");
const session = @import("session.zig");
/// Abstract connection, provided by a connector.
pub const Connection = struct {
/// Raw connection.
connection: *pg.Conn,
/// Connection implementation.
_interface: struct {
instance: *anyopaque,
release: *const fn (self: *Connection) void,
},
/// Release the connection.
pub fn release(self: *Connection) void {
self._interface.release(self);
}
};
/// Database connection manager for queries.
pub const Connector = struct {
const Self = @This();
/// Internal interface structure.
_interface: struct {
instance: *anyopaque,
getConnection: *const fn (self: *anyopaque) anyerror!*Connection,
},
/// Get a connection.
pub fn getConnection(self: Self) !*Connection {
return try self._interface.getConnection(self._interface.instance);
}
};
/// A simple pool connection.
pub const PoolConnection = struct {
const Self = @This();
/// Connector of the connection.
connector: *PoolConnector,
/// Connection instance, to only keep one at a time.
_connection: ?Connection = null,
/// Get a database connection.
pub fn connection(self: *Self) !*Connection {
if (self._connection == null) {
// A new connection needs to be initialized.
self._connection = .{
.connection = try self.connector.pool.acquire(),
._interface = .{
.instance = self,
.release = releaseConnection,
},
};
}
// Return the initialized connection.
return &(self._connection.?);
}
// Implementation.
/// Release the pool connection.
fn releaseConnection(self: *Connection) void {
self.connection.release();
// Free allocated connection.
const poolConnection: *PoolConnection = @ptrCast(@alignCast(self._interface.instance));
poolConnection.connector.pool._allocator.destroy(poolConnection);
}
};
/// A simple pool connector.
pub const PoolConnector = struct {
const Self = @This();
pool: *pg.Pool,
/// Get a database connector instance for the current pool.
pub fn connector(self: *Self) Connector {
return .{
._interface = .{
.instance = self,
.getConnection = getConnection,
},
};
}
// Implementation.
/// Get the connection from the pool.
fn getConnection(opaqueSelf: *anyopaque) !*Connection {
const self: *Self = @ptrCast(@alignCast(opaqueSelf));
// Initialize a new connection.
const poolConnection = try self.pool._allocator.create(PoolConnection);
poolConnection.* = .{
.connector = self,
};
// Acquire a new connection from the pool.
return try poolConnection.connection();
}
};

20
src/insert.zig
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@ -2,6 +2,7 @@ const std = @import("std");
const pg = @import("pg");
const zollections = @import("zollections");
const errors = @import("errors.zig");
const database = @import("database.zig");
const postgresql = @import("postgresql.zig");
const _sql = @import("sql.zig");
const repository = @import("repository.zig");
@ -118,7 +119,8 @@ pub fn RepositoryInsert(comptime Model: type, comptime TableShape: type, comptim
const Configuration = RepositoryInsertConfiguration(InsertShape);
arena: std.heap.ArenaAllocator,
database: *pg.Pool,
connector: database.Connector,
connection: *database.Connection = undefined,
insertConfig: Configuration,
sql: ?[]const u8 = null,
@ -289,20 +291,19 @@ pub fn RepositoryInsert(comptime Model: type, comptime TableShape: type, comptim
/// Execute the insert query.
fn execQuery(self: *Self) !*pg.Result {
// Get a connection to the database.
const connection = try self.database.acquire();
errdefer connection.release();
self.connection = try self.connector.getConnection();
errdefer self.connection.release();
// Initialize a new PostgreSQL statement.
var statement = try pg.Stmt.init(connection, .{
var statement = try pg.Stmt.init(self.connection.connection, .{
.column_names = true,
.release_conn = true,
.allocator = self.arena.allocator(),
});
errdefer statement.deinit();
// Prepare SQL insert query.
statement.prepare(self.sql.?)
catch |err| return postgresql.handlePostgresqlError(err, connection, &statement);
catch |err| return postgresql.handlePostgresqlError(err, self.connection, &statement);
// Bind INSERT query parameters.
for (self.insertConfig.values) |row| {
@ -317,7 +318,7 @@ pub fn RepositoryInsert(comptime Model: type, comptime TableShape: type, comptim
// Execute the query and get its result.
const result = statement.execute()
catch |err| return postgresql.handlePostgresqlError(err, connection, &statement);
catch |err| return postgresql.handlePostgresqlError(err, self.connection, &statement);
// Query executed successfully, return the result.
return result;
@ -330,6 +331,7 @@ pub fn RepositoryInsert(comptime Model: type, comptime TableShape: type, comptim
// Execute query and get its result.
var queryResult = try self.execQuery();
defer self.connection.release();
defer queryResult.deinit();
//TODO deduplicate this in postgresql.zig, we could do it if Mapper type was exposed.
@ -359,11 +361,11 @@ pub fn RepositoryInsert(comptime Model: type, comptime TableShape: type, comptim
}
/// Initialize a new repository insert query.
pub fn init(allocator: std.mem.Allocator, database: *pg.Pool) Self {
pub fn init(allocator: std.mem.Allocator, connector: database.Connector) Self {
return .{
// Initialize an arena allocator for the insert query.
.arena = std.heap.ArenaAllocator.init(allocator),
.database = database,
.connector = connector,
.insertConfig = .{},
};
}

5
src/postgresql.zig
View file

@ -2,6 +2,7 @@ const std = @import("std");
const pg = @import("pg");
const global = @import("global.zig");
const errors = @import("errors.zig");
const database = @import("database.zig");
const _sql = @import("sql.zig");
const repository = @import("repository.zig");
@ -31,12 +32,12 @@ pub fn bindQueryParameter(statement: *pg.Stmt, parameter: _sql.QueryParameter) !
}
/// PostgreSQL error handling by ZRM.
pub fn handlePostgresqlError(err: anyerror, connection: *pg.Conn, statement: *pg.Stmt) anyerror {
pub fn handlePostgresqlError(err: anyerror, connection: *database.Connection, statement: *pg.Stmt) anyerror {
// Release connection and statement as query failed.
defer statement.deinit();
defer connection.release();
if (connection.err) |sqlErr| {
if (connection.connection.err) |sqlErr| {
if (global.debugMode) {
// If debug mode is enabled, show the PostgreSQL error.
std.debug.print("PostgreSQL error\n{s}: {s}\n", .{sqlErr.code, sqlErr.message});

26
src/query.zig
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@ -2,6 +2,7 @@ const std = @import("std");
const pg = @import("pg");
const zollections = @import("zollections");
const errors = @import("errors.zig");
const database = @import("database.zig");
const postgresql = @import("postgresql.zig");
const _sql = @import("sql.zig");
const conditions = @import("conditions.zig");
@ -29,7 +30,8 @@ pub fn RepositoryQuery(comptime Model: type, comptime TableShape: type, comptime
const Self = @This();
arena: std.heap.ArenaAllocator,
database: *pg.Pool,
connector: database.Connector,
connection: *database.Connection = undefined,
queryConfig: RepositoryQueryConfiguration,
sql: ?[]const u8 = null,
@ -176,23 +178,21 @@ pub fn RepositoryQuery(comptime Model: type, comptime TableShape: type, comptime
}
/// Execute the built query.
fn execQuery(self: *Self) !*pg.Result
{
// Get a connection to the database.
const connection = try self.database.acquire();
errdefer connection.release();
fn execQuery(self: *Self) !*pg.Result {
// Get the connection to the database.
self.connection = try self.connector.getConnection();
errdefer self.connection.release();
// Initialize a new PostgreSQL statement.
var statement = try pg.Stmt.init(connection, .{
var statement = try pg.Stmt.init(self.connection.connection, .{
.column_names = true,
.release_conn = true,
.allocator = self.arena.allocator(),
});
errdefer statement.deinit();
// Prepare SQL query.
statement.prepare(self.sql.?)
catch |err| return postgresql.handlePostgresqlError(err, connection, &statement);
catch |err| return postgresql.handlePostgresqlError(err, self.connection, &statement);
// Bind query parameters.
if (self.queryConfig.select) |_select|
@ -204,7 +204,7 @@ pub fn RepositoryQuery(comptime Model: type, comptime TableShape: type, comptime
// Execute the query and get its result.
const result = statement.execute()
catch |err| return postgresql.handlePostgresqlError(err, connection, &statement);
catch |err| return postgresql.handlePostgresqlError(err, self.connection, &statement);
// Query executed successfully, return the result.
return result;
@ -217,6 +217,7 @@ pub fn RepositoryQuery(comptime Model: type, comptime TableShape: type, comptime
// Execute query and get its result.
var queryResult = try self.execQuery();
defer self.connection.release();
defer queryResult.deinit();
//TODO deduplicate this in postgresql.zig, we could do it if Mapper type was exposed.
@ -246,17 +247,18 @@ pub fn RepositoryQuery(comptime Model: type, comptime TableShape: type, comptime
}
/// Initialize a new repository query.
pub fn init(allocator: std.mem.Allocator, database: *pg.Pool, queryConfig: RepositoryQueryConfiguration) Self {
pub fn init(allocator: std.mem.Allocator, connector: database.Connector, queryConfig: RepositoryQueryConfiguration) Self {
return .{
// Initialize the query arena allocator.
.arena = std.heap.ArenaAllocator.init(allocator),
.database = database,
.connector = connector,
.queryConfig = queryConfig,
};
}
/// Deinitialize the repository query.
pub fn deinit(self: *Self) void {
// Free everything allocated for this query.
self.arena.deinit();
}
};

14
src/repository.zig
View file

@ -1,6 +1,6 @@
const std = @import("std");
const pg = @import("pg");
const zollections = @import("zollections");
const database = @import("database.zig");
const _sql = @import("sql.zig");
const _conditions = @import("conditions.zig");
const query = @import("query.zig");
@ -97,9 +97,9 @@ pub fn Repository(comptime Model: type, comptime TableShape: type, comptime conf
/// modelKey can be an array / slice of keys.
/// For composite keys: modelKey must be a struct with all the keys, matching the type of their corresponding field.
/// modelKey can be an array / slice of these structs.
pub fn find(allocator: std.mem.Allocator, database: *pg.Pool, modelKey: anytype) !RepositoryResult(Model) {
pub fn find(allocator: std.mem.Allocator, connector: database.Connector, modelKey: anytype) !RepositoryResult(Model) {
// Initialize a new query.
var modelQuery = Self.Query.init(allocator, database, .{});
var modelQuery = Self.Query.init(allocator, connector, .{});
defer modelQuery.deinit();
if (config.key.len == 1) {
@ -179,9 +179,9 @@ pub fn Repository(comptime Model: type, comptime TableShape: type, comptime conf
/// Perform creation of the given new model in the repository.
/// The model will be altered with the inserted values.
pub fn create(allocator: std.mem.Allocator, database: *pg.Pool, newModel: *Model) !RepositoryResult(Model) {
pub fn create(allocator: std.mem.Allocator, connector: database.Connector, newModel: *Model) !RepositoryResult(Model) {
// Initialize a new insert query for the given model.
var insertQuery = Self.Insert.init(allocator, database);
var insertQuery = Self.Insert.init(allocator, connector);
defer insertQuery.deinit();
try insertQuery.values(newModel);
insertQuery.returningAll();
@ -199,12 +199,12 @@ pub fn Repository(comptime Model: type, comptime TableShape: type, comptime conf
}
/// Perform save of the given existing model in the repository.
pub fn save(allocator: std.mem.Allocator, database: *pg.Pool, existingModel: *Model) !RepositoryResult(Model) {
pub fn save(allocator: std.mem.Allocator, connector: database.Connector, existingModel: *Model) !RepositoryResult(Model) {
// Convert the model to its SQL form.
const modelSql = try config.toSql(existingModel.*);
// Initialize a new update query for the given model.
var updateQuery = Self.Update(TableShape).init(allocator, database);
var updateQuery = Self.Update(TableShape).init(allocator, connector);
defer updateQuery.deinit();
try updateQuery.set(modelSql);
updateQuery.returningAll();

2
src/root.zig
View file

@ -14,6 +14,8 @@ pub const Insertable = insert.Insertable;
pub const QueryParameter = _sql.QueryParameter;
pub const SqlParams = _sql.SqlParams;
pub const database = @import("database.zig");
pub const conditions = @import("conditions.zig");
pub const errors = @import("errors.zig");

20
src/update.zig
View file

@ -2,6 +2,7 @@ const std = @import("std");
const pg = @import("pg");
const zollections = @import("zollections");
const errors = @import("errors.zig");
const database = @import("database.zig");
const postgresql = @import("postgresql.zig");
const _sql = @import("sql.zig");
const conditions = @import("conditions.zig");
@ -57,7 +58,8 @@ pub fn RepositoryUpdate(comptime Model: type, comptime TableShape: type, comptim
const Configuration = RepositoryUpdateConfiguration(UpdateShape);
arena: std.heap.ArenaAllocator,
database: *pg.Pool,
connector: database.Connector,
connection: *database.Connection = undefined,
updateConfig: Configuration,
sql: ?[]const u8 = null,
@ -261,20 +263,19 @@ pub fn RepositoryUpdate(comptime Model: type, comptime TableShape: type, comptim
/// Execute the update query.
fn execQuery(self: *Self) !*pg.Result {
// Get a connection to the database.
const connection = try self.database.acquire();
errdefer connection.release();
self.connection = try self.connector.getConnection();
errdefer self.connection.release();
// Initialize a new PostgreSQL statement.
var statement = try pg.Stmt.init(connection, .{
var statement = try pg.Stmt.init(self.connection.connection, .{
.column_names = true,
.release_conn = true,
.allocator = self.arena.allocator(),
});
errdefer statement.deinit();
// Prepare SQL update query.
statement.prepare(self.sql.?)
catch |err| return postgresql.handlePostgresqlError(err, connection, &statement);
catch |err| return postgresql.handlePostgresqlError(err, self.connection, &statement);
// Bind UPDATE query parameters.
inline for (columns) |column| {
@ -291,7 +292,7 @@ pub fn RepositoryUpdate(comptime Model: type, comptime TableShape: type, comptim
// Execute the query and get its result.
const result = statement.execute()
catch |err| return postgresql.handlePostgresqlError(err, connection, &statement);
catch |err| return postgresql.handlePostgresqlError(err, self.connection, &statement);
// Query executed successfully, return the result.
return result;
@ -304,6 +305,7 @@ pub fn RepositoryUpdate(comptime Model: type, comptime TableShape: type, comptim
// Execute query and get its result.
var queryResult = try self.execQuery();
defer self.connection.release();
defer queryResult.deinit();
//TODO deduplicate this in postgresql.zig, we could do it if Mapper type was exposed.
@ -333,11 +335,11 @@ pub fn RepositoryUpdate(comptime Model: type, comptime TableShape: type, comptim
}
/// Initialize a new repository update query.
pub fn init(allocator: std.mem.Allocator, database: *pg.Pool) Self {
pub fn init(allocator: std.mem.Allocator, connector: database.Connector) Self {
return .{
// Initialize an arena allocator for the update query.
.arena = std.heap.ArenaAllocator.init(allocator),
.database = database,
.connector = connector,
.updateConfig = .{},
};
}

14
tests/composite.zig
View file

@ -17,6 +17,7 @@ fn initDatabase() !void {
.password = "zrm",
.database = "zrm",
},
.size = 1,
});
}
@ -76,6 +77,9 @@ test "composite model create, save and find" {
try initDatabase();
defer database.deinit();
var poolConnector = zrm.database.PoolConnector{
.pool = database,
};
// Initialize a test model.
var newModel = CompositeModel{
@ -86,7 +90,7 @@ test "composite model create, save and find" {
// Create the new model.
var result = try CompositeModelRepository.create(std.testing.allocator, database, &newModel);
var result = try CompositeModelRepository.create(std.testing.allocator, poolConnector.connector(), &newModel);
defer result.deinit(); // Will clear some values in newModel.
// Check that the model is correctly defined.
@ -101,7 +105,7 @@ test "composite model create, save and find" {
// Update the model.
newModel.label = null;
var result2 = try CompositeModelRepository.save(std.testing.allocator, database, &newModel);
var result2 = try CompositeModelRepository.save(std.testing.allocator, poolConnector.connector(), &newModel);
defer result2.deinit(); // Will clear some values in newModel.
// Checking that the model has been updated (but only the right field).
@ -111,7 +115,7 @@ test "composite model create, save and find" {
// Do another insert with the same secondcol.
var insertQuery = CompositeModelRepository.Insert.init(std.testing.allocator, database);
var insertQuery = CompositeModelRepository.Insert.init(std.testing.allocator, poolConnector.connector());
defer insertQuery.deinit();
try insertQuery.values(.{
.secondcol = "identifier",
@ -128,7 +132,7 @@ test "composite model create, save and find" {
// Try to find the created then saved model, to check that everything has been saved correctly.
var result4 = try CompositeModelRepository.find(std.testing.allocator, database, .{
var result4 = try CompositeModelRepository.find(std.testing.allocator, poolConnector.connector(), .{
.firstcol = newModel.firstcol,
.secondcol = newModel.secondcol,
});
@ -139,7 +143,7 @@ test "composite model create, save and find" {
// Try to find multiple models at once.
var result5 = try CompositeModelRepository.find(std.testing.allocator, database, &[_]CompositeModelRepository.KeyType{
var result5 = try CompositeModelRepository.find(std.testing.allocator, poolConnector.connector(), &[_]CompositeModelRepository.KeyType{
.{
.firstcol = newModel.firstcol,
.secondcol = newModel.secondcol,

39
tests/repository.zig
View file

@ -17,6 +17,7 @@ fn initDatabase() !void {
.password = "zrm",
.database = "zrm",
},
.size = 1,
});
}
@ -105,8 +106,11 @@ test "repository query SQL builder" {
try initDatabase();
defer database.deinit();
var poolConnector = zrm.database.PoolConnector{
.pool = database,
};
var query = MyModelRepository.Query.init(std.testing.allocator, database, .{});
var query = MyModelRepository.Query.init(std.testing.allocator, poolConnector.connector(), .{});
defer query.deinit();
try query.whereIn(usize, "id", &[_]usize{1, 2});
try query.buildSql();
@ -121,9 +125,12 @@ test "repository element retrieval" {
try initDatabase();
defer database.deinit();
var poolConnector = zrm.database.PoolConnector{
.pool = database,
};
// Prepare a query for models.
var query = MyModelRepository.Query.init(std.testing.allocator, database, .{});
var query = MyModelRepository.Query.init(std.testing.allocator, poolConnector.connector(), .{});
try query.whereValue(usize, "id", "=", 1);
defer query.deinit();
@ -152,8 +159,11 @@ test "repository complex SQL query" {
try initDatabase();
defer database.deinit();
var poolConnector = zrm.database.PoolConnector{
.pool = database,
};
var query = MyModelRepository.Query.init(std.testing.allocator, database, .{});
var query = MyModelRepository.Query.init(std.testing.allocator, poolConnector.connector(), .{});
defer query.deinit();
query.where(
try query.newCondition().@"or"(&[_]zrm.SqlParams{
@ -187,6 +197,9 @@ test "repository element creation" {
try initDatabase();
defer database.deinit();
var poolConnector = zrm.database.PoolConnector{
.pool = database,
};
// Create a model to insert.
const newModel = MyModel{
@ -196,7 +209,7 @@ test "repository element creation" {
};
// Initialize an insert query.
var insertQuery = MyModelRepository.Insert.init(std.testing.allocator, database);
var insertQuery = MyModelRepository.Insert.init(std.testing.allocator, poolConnector.connector());
defer insertQuery.deinit();
// Insert the new model.
try insertQuery.values(newModel);
@ -225,11 +238,14 @@ test "repository element update" {
try initDatabase();
defer database.deinit();
var poolConnector = zrm.database.PoolConnector{
.pool = database,
};
// Initialize an update query.
var updateQuery = MyModelRepository.Update(struct {
name: []const u8,
}).init(std.testing.allocator, database);
}).init(std.testing.allocator, poolConnector.connector());
defer updateQuery.deinit();
// Update a model's name.
@ -260,6 +276,9 @@ test "model create, save and find" {
try initDatabase();
defer database.deinit();
var poolConnector = zrm.database.PoolConnector{
.pool = database,
};
// Initialize a test model.
var newModel = MyModel{
@ -270,7 +289,7 @@ test "model create, save and find" {
// Create the new model.
var result = try MyModelRepository.create(std.testing.allocator, database, &newModel);
var result = try MyModelRepository.create(std.testing.allocator, poolConnector.connector(), &newModel);
defer result.deinit(); // Will clear some values in newModel.
// Check that the model is correctly defined.
@ -284,7 +303,7 @@ test "model create, save and find" {
// Update the model.
newModel.name = "recently updated name";
var result2 = try MyModelRepository.save(std.testing.allocator, database, &newModel);
var result2 = try MyModelRepository.save(std.testing.allocator, poolConnector.connector(), &newModel);
defer result2.deinit(); // Will clear some values in newModel.
// Checking that the model has been updated (but only the right field).
@ -296,7 +315,7 @@ test "model create, save and find" {
// Do another update.
newModel.amount = 12.226;
var result3 = try MyModelRepository.save(std.testing.allocator, database, &newModel);
var result3 = try MyModelRepository.save(std.testing.allocator, poolConnector.connector(), &newModel);
defer result3.deinit(); // Will clear some values in newModel.
// Checking that the model has been updated (but only the right field).
@ -306,14 +325,14 @@ test "model create, save and find" {
// Try to find the created then saved model, to check that everything has been saved correctly.
var result4 = try MyModelRepository.find(std.testing.allocator, database, newModel.id);
var result4 = try MyModelRepository.find(std.testing.allocator, poolConnector.connector(), newModel.id);
defer result4.deinit(); // Will clear some values in newModel.
try std.testing.expectEqualDeep(newModel, result4.first().?.*);
// Try to find multiple models at once.
var result5 = try MyModelRepository.find(std.testing.allocator, database, &[_]i32{1, newModel.id});
var result5 = try MyModelRepository.find(std.testing.allocator, poolConnector.connector(), &[_]i32{1, newModel.id});
defer result5.deinit();
try std.testing.expectEqual(2, result5.models.len);