Add SQL Main class as general wrapper for SQL DB handling

src/corelibs/db_handling/sql_main.py

@@ -0,0 +1,76 @@
+"""
+Main SQL base for any SQL calls
+This is a wrapper for SQLiteIO or other future DB Interfaces
+[Note: at the moment only SQLiteIO is implemented]
+- on class creation connection with ValueError on fail
+- connect method checks if already connected and warns
+- connection class fails with ValueError if not valid target is selected (SQL wrapper type)
+- connected check class method
+- a process class that returns data as list or False if end or error
+
+TODO: adapt more CoreLibs DB IO class flow here
+"""
+
+from typing import TYPE_CHECKING, Any, Literal
+from corelibs.debug_handling.debug_helpers import call_stack
+from corelibs.db_handling.sqlite_io import SQLiteIO
+if TYPE_CHECKING:
+    from corelibs.logging_handling.log import Logger
+
+
+IDENT_SPLIT_CHARACTER: str = ':'
+
+
+class SQLMain:
+    """Main SQL interface class"""
+    def __init__(self, log: 'Logger', db_ident: str):
+        self.log = log
+        self.dbh: SQLiteIO | None = None
+        self.db_target: str | None = None
+        self.connect(db_ident)
+        if not self.connected():
+            raise ValueError(f'Failed to connect to database [{call_stack()}]')
+
+    def connect(self, db_ident: str):
+        """setup basic connection"""
+        if self.dbh is not None and self.dbh.conn is not None:
+            self.log.warning(f"A database connection already exists for: {self.db_target} [{call_stack()}]")
+            return
+        self.db_target, db_dsn = db_ident.split(IDENT_SPLIT_CHARACTER)
+        match self.db_target:
+            case 'sqlite':
+                # this is a Path only at the moment
+                self.dbh = SQLiteIO(self.log, db_dsn, row_factory='Dict')
+            case _:
+                raise ValueError(f'SQL interface for {self.db_target} is not implemented [{call_stack()}]')
+        if not self.dbh.db_connected():
+            raise ValueError(f"DB Connection failed for: {self.db_target} [{call_stack()}]")
+
+    def close(self):
+        """close connection"""
+        if self.dbh is None or not self.connected():
+            return
+        # self.log.info(f"Close DB Connection: {self.db_target} [{call_stack()}]")
+        self.dbh.db_close()
+
+    def connected(self) -> bool:
+        """check connectuon"""
+        if self.dbh is None or not self.dbh.db_connected():
+            self.log.warning(f"No connection [{call_stack()}]")
+            return False
+        return True
+
+    def process_query(
+        self, query: str, params: tuple[Any, ...] | None = None
+    ) -> list[tuple[Any, ...]] | list[dict[str, Any]] | Literal[False]:
+        """mini wrapper for execute query"""
+        if self.dbh is not None:
+            result = self.dbh.execute_query(query, params)
+            if result is False:
+                return False
+        else:
+            self.log.error(f"Problem connecting to db: {self.db_target} [{call_stack()}]")
+            return False
+        return result
+
+# __END__

test-run/db_handling/sql_main.py

@@ -0,0 +1,139 @@
+"""
+SQL Main wrapper test
+"""
+
+from pathlib import Path
+from uuid import uuid4
+import json
+from corelibs.debug_handling.dump_data import dump_data
+from corelibs.logging_handling.log import Log, Logger
+from corelibs.db_handling.sql_main import SQLMain
+
+SCRIPT_PATH: Path = Path(__file__).resolve().parent
+ROOT_PATH: Path = SCRIPT_PATH
+DATABASE_DIR: Path = Path("database")
+LOG_DIR: Path = Path("log")
+
+
+def main() -> None:
+    """
+    Comment
+    """
+    log = Log(
+        log_path=ROOT_PATH.joinpath(LOG_DIR, 'sqlite_main.log'),
+        log_name="SQLite Main",
+        log_settings={
+            "log_level_console": 'DEBUG',
+            "log_level_file": 'DEBUG',
+        }
+    )
+    sql_main = SQLMain(
+        log=Logger(log.get_logger_settings()),
+        db_ident=f"sqlite:{ROOT_PATH.joinpath(DATABASE_DIR, 'test_sqlite_main.db')}"
+    )
+    if sql_main.connected():
+        log.info("SQL Main connected successfully")
+    else:
+        log.error('SQL Main connection failed')
+    if sql_main.dbh is None:
+        log.error('SQL Main DBH instance is None')
+        return
+
+    if sql_main.dbh.trigger_exists('trg_test_a_set_date_updated_on_update'):
+        log.info("Trigger trg_test_a_set_date_updated_on_update exists")
+    if sql_main.dbh.table_exists('test_a'):
+        log.info("Table test_a exists, dropping for clean test")
+        sql_main.dbh.execute_query("DROP TABLE test_a;")
+    # create a dummy table
+    table_sql = """
+    CREATE TABLE IF NOT EXISTS test_a (
+        test_a_id INTEGER PRIMARY KEY,
+        date_created TEXT DEFAULT (strftime('%Y-%m-%d %H:%M:%f', 'now')),
+        date_updated TEXT,
+        uid TEXT NOT NULL UNIQUE,
+        set_current_timestamp TEXT DEFAULT CURRENT_TIMESTAMP,
+        text_a TEXT,
+        content,
+        int_a INTEGER,
+        float_a REAL
+    );
+    """
+
+    result = sql_main.dbh.execute_query(table_sql)
+    log.debug(f"Create table result: {result}")
+    trigger_sql = """
+    CREATE TRIGGER trg_test_a_set_date_updated_on_update
+        AFTER UPDATE ON test_a
+        FOR EACH ROW
+        WHEN OLD.date_updated IS NULL OR NEW.date_updated = OLD.date_updated
+    BEGIN
+        UPDATE test_a
+        SET date_updated = (strftime('%Y-%m-%d %H:%M:%f', 'now'))
+        WHERE test_a_id = NEW.test_a_id;
+    END;
+    """
+    result = sql_main.dbh.execute_query(trigger_sql)
+    log.debug(f"Create trigger result: {result}")
+    result = sql_main.dbh.meta_data_detail('test_a')
+    log.debug(f"Table meta data detail: {dump_data(result)}")
+    # INSERT DATA
+    sql = """
+    INSERT INTO test_a (uid, text_a, content, int_a, float_a)
+    VALUES (?, ?, ?, ?, ?)
+    RETURNING test_a_id, uid;
+    """
+    result = sql_main.dbh.execute_query(
+        sql,
+        (
+            str(uuid4()),
+            'Some text A',
+            json.dumps({'foo': 'bar', 'number': 42}),
+            123,
+            123.456,
+        )
+    )
+    log.debug(f"[1] Insert data result: {dump_data(result)}")
+    __uid: str = ''
+    if result is not False:
+        # first one only of interest
+        result = dict(result[0])
+        __uid = str(result.get('uid', ''))
+    # second insert
+    result = sql_main.dbh.execute_query(
+        sql,
+        (
+            str(uuid4()),
+            'Some text A',
+            json.dumps({'foo': 'bar', 'number': 42}),
+            123,
+            123.456,
+        )
+    )
+    log.debug(f"[2] Insert data result: {dump_data(result)}")
+    result = sql_main.dbh.execute_query("SELECT * FROM test_a;")
+    log.debug(f"Select data result: {dump_data(result)}")
+    result = sql_main.dbh.return_one("SELECT * FROM test_a WHERE uid = ?;", (__uid,))
+    log.debug(f"Fetch row result: {dump_data(result)}")
+    sql = """
+    UPDATE test_a
+    SET text_a = ?
+    WHERE uid = ?;
+    """
+    result = sql_main.dbh.execute_query(
+        sql,
+        (
+            'Some updated text A',
+            __uid,
+        )
+    )
+    log.debug(f"Update data result: {dump_data(result)}")
+    result = sql_main.dbh.return_one("SELECT * FROM test_a WHERE uid = ?;", (__uid,))
+    log.debug(f"Fetch row after update result: {dump_data(result)}")
+
+    sql_main.close()
+
+
+if __name__ == "__main__":
+    main()
+
+# __END__

test-run/db_handling/sqlite_io.py

@@ -1,7 +1,5 @@
-#!/usr/bin/env python3
-
 """
-Main comment
+SQLite IO test
 """
 
 from pathlib import Path

tests/unit/db_handling/test_sql_main.py

@@ -0,0 +1,461 @@
+"""
+PyTest: db_handling/sql_main
+Tests for SQLMain class - Main SQL interface wrapper
+
+Note: Pylance warnings about "Redefining name from outer scope" in fixtures are expected.
+This is standard pytest fixture behavior where fixture parameters shadow fixture definitions.
+"""
+# pylint: disable=redefined-outer-name,too-many-public-methods,protected-access
+# pyright: reportUnknownParameterType=false, reportUnknownArgumentType=false
+# pyright: reportMissingParameterType=false, reportUnknownVariableType=false
+# pyright: reportArgumentType=false, reportGeneralTypeIssues=false
+
+from pathlib import Path
+from typing import Generator
+from unittest.mock import MagicMock, patch
+import pytest
+from corelibs.db_handling.sql_main import SQLMain, IDENT_SPLIT_CHARACTER
+from corelibs.db_handling.sqlite_io import SQLiteIO
+
+
+# Test fixtures
+@pytest.fixture
+def mock_logger() -> MagicMock:
+    """Create a mock logger for testing"""
+    logger = MagicMock()
+    logger.debug = MagicMock()
+    logger.info = MagicMock()
+    logger.warning = MagicMock()
+    logger.error = MagicMock()
+    return logger
+
+
+@pytest.fixture
+def temp_db_path(tmp_path: Path) -> Path:
+    """Create a temporary database file path"""
+    return tmp_path / "test_database.db"
+
+
+@pytest.fixture
+def mock_sqlite_io() -> Generator[MagicMock, None, None]:
+    """Create a mock SQLiteIO instance"""
+    mock_io = MagicMock(spec=SQLiteIO)
+    mock_io.conn = MagicMock()
+    mock_io.db_connected = MagicMock(return_value=True)
+    mock_io.db_close = MagicMock()
+    mock_io.execute_query = MagicMock(return_value=[])
+    yield mock_io
+
+
+# Test constant
+class TestConstants:
+    """Tests for module-level constants"""
+
+    def test_ident_split_character(self):
+        """Test that IDENT_SPLIT_CHARACTER is defined correctly"""
+        assert IDENT_SPLIT_CHARACTER == ':'
+
+
+# Test SQLMain class initialization
+class TestSQLMainInit:
+    """Tests for SQLMain.__init__"""
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_successful_initialization_sqlite(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test successful initialization with SQLite"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        assert sql_main.log == mock_logger
+        assert sql_main.dbh == mock_sqlite_instance
+        assert sql_main.db_target == 'sqlite'
+        mock_sqlite_class.assert_called_once_with(mock_logger, str(temp_db_path), row_factory='Dict')
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_initialization_connection_failure(self, mock_sqlite_class: MagicMock, mock_logger: MagicMock):
+        """Test initialization fails when connection cannot be established"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = None
+        mock_sqlite_instance.db_connected = MagicMock(return_value=False)
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = 'sqlite:/path/to/db.db'
+        with pytest.raises(ValueError, match='DB Connection failed for: sqlite'):
+            SQLMain(mock_logger, db_ident)
+
+    def test_initialization_invalid_db_target(self, mock_logger: MagicMock):
+        """Test initialization with unsupported database target"""
+        db_ident = 'postgresql:/path/to/db'
+        with pytest.raises(ValueError, match='SQL interface for postgresql is not implemented'):
+            SQLMain(mock_logger, db_ident)
+
+    def test_initialization_malformed_db_ident(self, mock_logger: MagicMock):
+        """Test initialization with malformed db_ident string"""
+        db_ident = 'sqlite_no_colon'
+        with pytest.raises(ValueError):
+            SQLMain(mock_logger, db_ident)
+
+
+# Test SQLMain.connect method
+class TestSQLMainConnect:
+    """Tests for SQLMain.connect"""
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_connect_when_already_connected(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test connect warns when already connected"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        # Reset mock to check second call
+        mock_logger.warning.reset_mock()
+
+        # Try to connect again
+        sql_main.connect(f'sqlite:{temp_db_path}')
+
+        # Should have warned about existing connection
+        mock_logger.warning.assert_called_once()
+        assert 'already exists' in str(mock_logger.warning.call_args)
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_connect_sqlite_success(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test successful SQLite connection"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        sql_main = SQLMain.__new__(SQLMain)
+        sql_main.log = mock_logger
+        sql_main.dbh = None
+        sql_main.db_target = None
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main.connect(db_ident)
+
+        assert sql_main.db_target == 'sqlite'
+        assert sql_main.dbh == mock_sqlite_instance
+        mock_sqlite_class.assert_called_once_with(mock_logger, str(temp_db_path), row_factory='Dict')
+
+    def test_connect_unsupported_database(self, mock_logger: MagicMock):
+        """Test connect with unsupported database type"""
+        sql_main = SQLMain.__new__(SQLMain)
+        sql_main.log = mock_logger
+        sql_main.dbh = None
+        sql_main.db_target = None
+
+        db_ident = 'mysql:/path/to/db'
+        with pytest.raises(ValueError, match='SQL interface for mysql is not implemented'):
+            sql_main.connect(db_ident)
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_connect_db_connection_failed(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test connect raises error when DB connection fails"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=False)
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        sql_main = SQLMain.__new__(SQLMain)
+        sql_main.log = mock_logger
+        sql_main.dbh = None
+        sql_main.db_target = None
+
+        db_ident = f'sqlite:{temp_db_path}'
+        with pytest.raises(ValueError, match='DB Connection failed for: sqlite'):
+            sql_main.connect(db_ident)
+
+
+# Test SQLMain.close method
+class TestSQLMainClose:
+    """Tests for SQLMain.close"""
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_close_successful(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test successful database close"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_instance.db_close = MagicMock()
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        sql_main.close()
+
+        mock_sqlite_instance.db_close.assert_called_once()
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_close_when_not_connected(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test close when not connected does nothing"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_instance.db_close = MagicMock()
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        # Change db_connected to return False to simulate disconnection
+        mock_sqlite_instance.db_connected = MagicMock(return_value=False)
+
+        sql_main.close()
+
+        # Should not raise error and should exit early
+        assert mock_sqlite_instance.db_close.call_count == 0
+
+    def test_close_when_dbh_is_none(self, mock_logger: MagicMock):
+        """Test close when dbh is None"""
+        sql_main = SQLMain.__new__(SQLMain)
+        sql_main.log = mock_logger
+        sql_main.dbh = None
+        sql_main.db_target = 'sqlite'
+
+        # Should not raise error
+        sql_main.close()
+
+
+# Test SQLMain.connected method
+class TestSQLMainConnected:
+    """Tests for SQLMain.connected"""
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_connected_returns_true(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test connected returns True when connected"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        assert sql_main.connected() is True
+        mock_logger.warning.assert_not_called()
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_connected_returns_false_when_not_connected(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test connected returns False and warns when not connected"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        # Reset warning calls from init
+        mock_logger.warning.reset_mock()
+
+        # Change db_connected to return False to simulate disconnection
+        mock_sqlite_instance.db_connected = MagicMock(return_value=False)
+
+        assert sql_main.connected() is False
+        mock_logger.warning.assert_called_once()
+        assert 'No connection' in str(mock_logger.warning.call_args)
+
+    def test_connected_returns_false_when_dbh_is_none(self, mock_logger: MagicMock):
+        """Test connected returns False when dbh is None"""
+        sql_main = SQLMain.__new__(SQLMain)
+        sql_main.log = mock_logger
+        sql_main.dbh = None
+        sql_main.db_target = 'sqlite'
+
+        assert sql_main.connected() is False
+        mock_logger.warning.assert_called_once()
+
+
+# Test SQLMain.process_query method
+class TestSQLMainProcessQuery:
+    """Tests for SQLMain.process_query"""
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_process_query_success_no_params(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test successful query execution without parameters"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        expected_result = [{'id': 1, 'name': 'test'}]
+        mock_sqlite_instance.execute_query = MagicMock(return_value=expected_result)
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        query = "SELECT * FROM test"
+        result = sql_main.process_query(query)
+
+        assert result == expected_result
+        mock_sqlite_instance.execute_query.assert_called_once_with(query, None)
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_process_query_success_with_params(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test successful query execution with parameters"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        expected_result = [{'id': 1, 'name': 'test'}]
+        mock_sqlite_instance.execute_query = MagicMock(return_value=expected_result)
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        query = "SELECT * FROM test WHERE id = ?"
+        params = (1,)
+        result = sql_main.process_query(query, params)
+
+        assert result == expected_result
+        mock_sqlite_instance.execute_query.assert_called_once_with(query, params)
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_process_query_returns_false_on_error(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test query returns False when execute_query fails"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_instance.execute_query = MagicMock(return_value=False)
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        query = "SELECT * FROM nonexistent"
+        result = sql_main.process_query(query)
+
+        assert result is False
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_process_query_dbh_is_none(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test query returns False when dbh is None"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        # Manually set dbh to None
+        sql_main.dbh = None
+
+        query = "SELECT * FROM test"
+        result = sql_main.process_query(query)
+
+        assert result is False
+        mock_logger.error.assert_called_once()
+        assert 'Problem connecting to db' in str(mock_logger.error.call_args)
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_process_query_returns_empty_list(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test query returns empty list when no results"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_instance.execute_query = MagicMock(return_value=[])
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        query = "SELECT * FROM test WHERE 1=0"
+        result = sql_main.process_query(query)
+
+        assert result == []
+
+
+# Integration-like tests
+class TestSQLMainIntegration:
+    """Integration-like tests for complete workflows"""
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_full_workflow_connect_query_close(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test complete workflow: connect, query, close"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_instance.execute_query = MagicMock(return_value=[{'count': 5}])
+        mock_sqlite_instance.db_close = MagicMock()
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        # Execute query
+        result = sql_main.process_query("SELECT COUNT(*) as count FROM test")
+        assert result == [{'count': 5}]
+
+        # Check connected
+        assert sql_main.connected() is True
+
+        # Close connection
+        sql_main.close()
+        mock_sqlite_instance.db_close.assert_called_once()
+
+    @patch('corelibs.db_handling.sql_main.SQLiteIO')
+    def test_multiple_queries_same_connection(
+        self, mock_sqlite_class: MagicMock, mock_logger: MagicMock, temp_db_path: Path
+    ):
+        """Test multiple queries on the same connection"""
+        mock_sqlite_instance = MagicMock()
+        mock_sqlite_instance.conn = MagicMock()
+        mock_sqlite_instance.db_connected = MagicMock(return_value=True)
+        mock_sqlite_instance.execute_query = MagicMock(side_effect=[
+            [{'id': 1}],
+            [{'id': 2}],
+            [{'id': 3}]
+        ])
+        mock_sqlite_class.return_value = mock_sqlite_instance
+
+        db_ident = f'sqlite:{temp_db_path}'
+        sql_main = SQLMain(mock_logger, db_ident)
+
+        result1 = sql_main.process_query("SELECT * FROM test WHERE id = 1")
+        result2 = sql_main.process_query("SELECT * FROM test WHERE id = 2")
+        result3 = sql_main.process_query("SELECT * FROM test WHERE id = 3")
+
+        assert result1 == [{'id': 1}]
+        assert result2 == [{'id': 2}]
+        assert result3 == [{'id': 3}]
+        assert mock_sqlite_instance.execute_query.call_count == 3
+
+
+# __END__