mirror of
https://github.com/1Panel-dev/MaxKB.git
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124 lines
4.8 KiB
Python
124 lines
4.8 KiB
Python
# coding=utf-8
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"""
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@project: maxkb
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@Author：虎
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@file： compiler.py
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@date：2023/10/7 10:53
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@desc:
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"""
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from django.core.exceptions import EmptyResultSet
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from django.db import NotSupportedError
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from django.db.models.sql.compiler import SQLCompiler
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class AppSQLCompiler(SQLCompiler):
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def __init__(self, query, connection, using, elide_empty=True, field_replace_dict=None):
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super().__init__(query, connection, using, elide_empty)
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if field_replace_dict is None:
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field_replace_dict = {}
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self.field_replace_dict = field_replace_dict
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def get_query_str(self, with_limits=True, with_table_name=True):
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refcounts_before = self.query.alias_refcount.copy()
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try:
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extra_select, order_by, group_by = self.pre_sql_setup()
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for_update_part = None
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# Is a LIMIT/OFFSET clause needed?
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with_limit_offset = with_limits and (
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self.query.high_mark is not None or self.query.low_mark
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)
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combinator = self.query.combinator
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features = self.connection.features
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if combinator:
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if not getattr(features, "supports_select_{}".format(combinator)):
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raise NotSupportedError(
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"{} is not supported on this database backend.".format(
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combinator
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)
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)
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result, params = self.get_combinator_sql(
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combinator, self.query.combinator_all
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)
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else:
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distinct_fields, distinct_params = self.get_distinct()
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try:
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where, w_params = (
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self.compile(self.where) if self.where is not None else ("", [])
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)
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except EmptyResultSet:
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if self.elide_empty:
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raise
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# Use a predicate that's always False.
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where, w_params = "0 = 1", []
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having, h_params = (
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self.compile(self.having) if self.having is not None else ("", [])
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)
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result = []
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params = []
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if where:
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result.append("WHERE %s" % where)
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params.extend(w_params)
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grouping = []
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for g_sql, g_params in group_by:
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grouping.append(g_sql)
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params.extend(g_params)
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if grouping:
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if distinct_fields:
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raise NotImplementedError(
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"annotate() + distinct(fields) is not implemented."
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)
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order_by = order_by or self.connection.ops.force_no_ordering()
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result.append("GROUP BY %s" % ", ".join(grouping))
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if self._meta_ordering:
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order_by = None
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if having:
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result.append("HAVING %s" % having)
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params.extend(h_params)
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if self.query.explain_info:
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result.insert(
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0,
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self.connection.ops.explain_query_prefix(
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self.query.explain_info.format,
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**self.query.explain_info.options,
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),
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)
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if order_by:
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ordering = []
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for _, (o_sql, o_params, _) in order_by:
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ordering.append(o_sql)
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params.extend(o_params)
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result.append("ORDER BY %s" % ", ".join(ordering))
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if with_limit_offset:
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result.append(
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self.connection.ops.limit_offset_sql(
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self.query.low_mark, self.query.high_mark
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)
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)
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if for_update_part and not features.for_update_after_from:
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result.append(for_update_part)
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from_, f_params = self.get_from_clause()
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sql = " ".join(result)
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if not with_table_name:
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for table_name in from_:
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sql = sql.replace(table_name + ".", "")
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for key in self.field_replace_dict.keys():
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value = self.field_replace_dict.get(key)
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sql = sql.replace(key, value)
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return sql, tuple(params)
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finally:
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# Finally do cleanup - get rid of the joins we created above.
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self.query.reset_refcounts(refcounts_before)
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def as_sql(self, with_limits=True, with_col_aliases=False, select_string=None):
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if select_string is None:
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return super().as_sql(with_limits, with_col_aliases)
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else:
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sql, params = self.get_query_str(with_table_name=False)
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return (select_string + " " + sql), params
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