假定只有在调试时才有意义，可以使用echo=True启动SQLAlchemy，以记录所有SQL查询。例如:

engine = create_engine(
    "mysql://scott:tiger@hostname/dbname",
    encoding="latin1",
    echo=True,
)

这也可以修改为一个单一的请求:

echo=False -如果为True，引擎将记录所有语句以及它们参数列表的repr()到引擎记录器，默认为sys.stdout。Engine的echo属性可以在任何时候修改以打开和关闭日志。如果设置为字符串"debug"，结果行也将打印到标准输出。这个标志最终控制一个Python日志记录器;有关如何直接配置日志的信息，请参阅配置日志。 来源:SQLAlchemy Engine Configuration

如果与Flask一起使用，您可以简单地设置

app.config["SQLALCHEMY_ECHO"] = True

得到相同的行为。

这段代码是基于@bukzor现有的精彩答案。我刚刚为datetime添加了自定义渲染。datetime类型到Oracle的TO_DATE()。

请随时更新代码，以适应您的数据库:

import decimal
import datetime

def printquery(statement, bind=None):
    """
    print a query, with values filled in
    for debugging purposes *only*
    for security, you should always separate queries from their values
    please also note that this function is quite slow
    """
    import sqlalchemy.orm
    if isinstance(statement, sqlalchemy.orm.Query):
        if bind is None:
            bind = statement.session.get_bind(
                    statement._mapper_zero_or_none()
            )
        statement = statement.statement
    elif bind is None:
        bind = statement.bind 

    dialect = bind.dialect
    compiler = statement._compiler(dialect)
    class LiteralCompiler(compiler.__class__):
        def visit_bindparam(
                self, bindparam, within_columns_clause=False, 
                literal_binds=False, **kwargs
        ):
            return super(LiteralCompiler, self).render_literal_bindparam(
                    bindparam, within_columns_clause=within_columns_clause,
                    literal_binds=literal_binds, **kwargs
            )
        def render_literal_value(self, value, type_):
            """Render the value of a bind parameter as a quoted literal.

            This is used for statement sections that do not accept bind paramters
            on the target driver/database.

            This should be implemented by subclasses using the quoting services
            of the DBAPI.

            """
            if isinstance(value, basestring):
                value = value.replace("'", "''")
                return "'%s'" % value
            elif value is None:
                return "NULL"
            elif isinstance(value, (float, int, long)):
                return repr(value)
            elif isinstance(value, decimal.Decimal):
                return str(value)
            elif isinstance(value, datetime.datetime):
                return "TO_DATE('%s','YYYY-MM-DD HH24:MI:SS')" % value.strftime("%Y-%m-%d %H:%M:%S")

            else:
                raise NotImplementedError(
                            "Don't know how to literal-quote value %r" % value)            

    compiler = LiteralCompiler(dialect, statement)
    print compiler.process(statement)

使用Python日志代替echo=True标记记录SQL查询: 导入日志 logging.basicConfig () logging.getLogger (sqlalchemy.engine) .setLevel (logging.INFO)

根据文档。

为此，我们可以使用compile方法。从文档中可以看出:

from sqlalchemy.sql import text
from sqlalchemy.dialects import postgresql

stmt = text("SELECT * FROM users WHERE users.name BETWEEN :x AND :y")
stmt = stmt.bindparams(x="m", y="z")

print(stmt.compile(dialect=postgresql.dialect(),compile_kwargs={"literal_binds": True}))

结果:

SELECT * FROM users WHERE users.name BETWEEN 'm' AND 'z'

医生警告:

永远不要对从不受信任方接收的字符串内容使用此技术 输入，例如来自web表单或其他用户输入应用程序。 SQLAlchemy将Python值强制转换为直接SQL字符串的功能 值对于不受信任的输入是不安全的，并且不验证 传递的数据类型。时总是使用绑定参数 以编程方式对关系调用非ddl SQL语句 数据库。

这就是我的方法

# query is instance of: from sqlalchemy import select
def raw_query(query):
    q = str(query.compile())
    p = query.compile().params
    for k in p.keys():
        v = p.get(k)
        if isinstance(v, (int, float, complex)):
            q = q.replace(f":{k}", f"{v}")
        else:
            q = q.replace(f":{k}", f"'{v}'")
    print(q)

如何使用:

from sqlalchemy import select

select_query = select([
    any_model_table.c["id_account"],
    any_model_table.c["id_provider"],
    any_model_table.c["id_service"],
    func.sum(any_model_table.c["items"]).label("items"),
    # @eaf
    func.date_format(func.now(), "%Y-%m-%d").label("some_date"),
    func.date_format(func.now(), "%Y").label("as_year"),
    func.date_format(func.now(), "%m").label("as_month"),
    func.date_format(func.now(), "%d").label("as_day"),
]).group_by(
    any_model_table.c.id_account,
    any_model_table.c.id_provider,
    any_model_table.c.id_service
).where(
    any_model_table.c.id == 5

).where(
    func.date_format(any_model_table.c.dt, "%Y-%m-%d") == datetime.utcnow().strftime('%Y-%m-%d')
)

raw_query(select_query)

只是一个简单的彩色示例与ORM的查询和pydings。

import sqlparse
from pygments import highlight
from pygments.formatters.terminal import TerminalFormatter
from pygments.lexers import SqlLexer
from sqlalchemy import create_engine
from sqlalchemy.orm import Query

engine = create_engine("sqlite+pysqlite:///db.sqlite", echo=True, future=True)

def format_sql(query: Query):
    compiled = query.statement.compile(
         engine, compile_kwargs={"literal_binds": True})
    parsed = sqlparse.format(str(compiled), reindent=True, keyword_case='upper')
    print(highlight(parsed, SqlLexer(), TerminalFormatter()))

或者没有sqlparse的版本(没有sqlparse输出的新行更少)

def format_sql(query: Query):
    compiled = query.statement.compile(
        engine, compile_kwargs={"literal_binds": True})
    print(highlight(str(compiled), SqlLexer(), TerminalFormatter()))