MetaCodeContext#

class swordfish._connection.MetaCodeContext(impl)#

Used for generating meta code.

Examples

>>> with sf.meta_code() as m:
...     code = m.var("a")
>>> code
MetaCode(< a >)

var(name)#

Generates meta code representing a variable by its name.

Examples

>>> with sf.meta_code() as m:
...     code = m.var("a")
>>> code
MetaCode(< a >)

const(obj)#

Generates meta code representing a Constant.

Examples

>>> with sf.meta_code():
...     code = x.const(2)
>>> code
MetaCode(< 2 >)

col(name, *, qualifier=None)#

Generates meta code for a column.

Parameters:

name (str) – The name of the column.
qualifier (str, optional) – The qualifier for the column. Defaults to None.

Returns:

The generated meta code.

Return type:

MetaCode

Examples

>>> with sf.meta_code():
...     code = x.col("id", qualifier="t")
>>> code
MetaCode(< t.id >)

col_alias(obj, name)#

Generates meta code for assigning an alias to a column or aliases to columns.

Parameters:

Returns:

The meta code with the column alias applied.

Return type:

MetaCode

Examples

>>> with sf.meta_code():
...     code = x.col_alias(x.col("id"), "col1")
>>> code
MetaCode(< id as col1 >)

parse(expression)#

Parses a string expression into corresponding meta code.

Parameters:: expression (str) – The expression to parse into meta code.
Returns:: The parsed meta code corresponding to the expression.
Return type:: MetaCode

Examples

>>> with sf.meta_code():
...     code = x.parse("a == 5")
>>> code
MetaCode(< a == 5 >)

call(func, *args)#

make_table_joiner(func, *args)#