本文整理汇总了Python中django.db.models.sql.compiler.SQLCompiler方法的典型用法代码示例。如果您正苦于以下问题：Python compiler.SQLCompiler方法的具体用法？Python compiler.SQLCompiler怎么用？Python compiler.SQLCompiler使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类django.db.models.sql.compiler的用法示例。
在下文中一共展示了compiler.SQLCompiler方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: as_sql
# 需要导入模块: from django.db.models.sql import compiler [as 别名]
# 或者: from django.db.models.sql.compiler import SQLCompiler [as 别名]
def as_sql(self, with_limits=True, with_col_aliases=False, subquery=False):
"""
Creates the SQL for this query. Returns the SQL string and list
of parameters. This is overridden from the original Query class
to handle the additional SQL Oracle requires to emulate LIMIT
and OFFSET.
If 'with_limits' is False, any limit/offset information is not
included in the query.
"""
if with_limits and self.query.low_mark == self.query.high_mark:
return '', ()
# The `do_offset` flag indicates whether we need to construct
# the SQL needed to use limit/offset with Oracle.
do_offset = with_limits and (self.query.high_mark is not None
or self.query.low_mark)
if not do_offset:
sql, params = super(SQLCompiler, self).as_sql(
with_limits=False,
with_col_aliases=with_col_aliases,
subquery=subquery,
)
else:
sql, params = super(SQLCompiler, self).as_sql(
with_limits=False,
with_col_aliases=True,
subquery=subquery,
)
# Wrap the base query in an outer SELECT * with boundaries on
# the "_RN" column. This is the canonical way to emulate LIMIT
# and OFFSET on Oracle.
high_where = ''
if self.query.high_mark is not None:
high_where = 'WHERE ROWNUM <= %d' % (self.query.high_mark,)
sql = (
'SELECT * FROM (SELECT "_SUB".*, ROWNUM AS "_RN" FROM (%s) '
'"_SUB" %s) WHERE "_RN" > %d' % (sql, high_where, self.query.low_mark)
)
return sql, params 示例2: as_sql
# 需要导入模块: from django.db.models.sql import compiler [as 别名]
# 或者: from django.db.models.sql.compiler import SQLCompiler [as 别名]
def as_sql(self, with_limits=True, with_col_aliases=False):
"""
Creates the SQL for this query. Returns the SQL string and list
of parameters. This is overriden from the original Query class
to handle the additional SQL Oracle requires to emulate LIMIT
and OFFSET.
If 'with_limits' is False, any limit/offset information is not
included in the query.
"""
if with_limits and self.query.low_mark == self.query.high_mark:
return '', ()
# The `do_offset` flag indicates whether we need to construct
# the SQL needed to use limit/offset with Oracle.
do_offset = with_limits and (self.query.high_mark is not None
or self.query.low_mark)
if not do_offset:
sql, params = super(SQLCompiler, self).as_sql(with_limits=False,
with_col_aliases=with_col_aliases)
else:
sql, params = super(SQLCompiler, self).as_sql(with_limits=False,
with_col_aliases=True)
# Wrap the base query in an outer SELECT * with boundaries on
# the "_RN" column. This is the canonical way to emulate LIMIT
# and OFFSET on Oracle.
high_where = ''
if self.query.high_mark is not None:
high_where = 'WHERE ROWNUM <= %d' % (self.query.high_mark,)
sql = 'SELECT * FROM (SELECT ROWNUM AS "_RN", "_SUB".* FROM (%s) "_SUB" %s) WHERE "_RN" > %d' % (sql, high_where, self.query.low_mark)
return sql, params 示例3: as_sql
# 需要导入模块: from django.db.models.sql import compiler [as 别名]
# 或者: from django.db.models.sql.compiler import SQLCompiler [as 别名]
def as_sql(self, with_limits=True, with_col_aliases=False):
"""
Creates the SQL for this query. Returns the SQL string and list
of parameters. This is overridden from the original Query class
to handle the additional SQL Oracle requires to emulate LIMIT
and OFFSET.
If 'with_limits' is False, any limit/offset information is not
included in the query.
"""
# The `do_offset` flag indicates whether we need to construct
# the SQL needed to use limit/offset with Oracle.
do_offset = with_limits and (self.query.high_mark is not None or self.query.low_mark)
if not do_offset:
sql, params = super(SQLCompiler, self).as_sql(
with_limits=False,
with_col_aliases=with_col_aliases,
)
else:
sql, params = super(SQLCompiler, self).as_sql(
with_limits=False,
with_col_aliases=True,
)
# Wrap the base query in an outer SELECT * with boundaries on
# the "_RN" column. This is the canonical way to emulate LIMIT
# and OFFSET on Oracle.
high_where = ''
if self.query.high_mark is not None:
high_where = 'WHERE ROWNUM <= %d' % (self.query.high_mark,)
if self.query.low_mark:
sql = (
'SELECT * FROM (SELECT "_SUB".*, ROWNUM AS "_RN" FROM (%s) '
'"_SUB" %s) WHERE "_RN" > %d' % (sql, high_where, self.query.low_mark)
)
else:
# Simplify the query to support subqueries if there's no offset.
sql = (
'SELECT * FROM (SELECT "_SUB".* FROM (%s) "_SUB" %s)' % (sql, high_where)
)
return sql, params