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fix: teradata adapter + resultset #135

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fix: teradata adapter + resultset #135

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2682e30
fix: teradata adapter + resultset
Feb 3, 2026
eef679f
Move Teradata LOCKING/SEL handling to adapter classify_query
Maxteabag Mar 20, 2026
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80 changes: 50 additions & 30 deletions sqlit/domains/connections/providers/teradata/adapter.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,13 +2,13 @@

from __future__ import annotations

import re
from typing import TYPE_CHECKING, Any

from sqlit.domains.connections.providers.adapters.base import (
ColumnInfo,
CursorBasedAdapter,
IndexInfo,
SequenceInfo,
TableInfo,
TriggerInfo,
)
Expand Down Expand Up @@ -49,9 +49,27 @@ def supports_cross_database_queries(self) -> bool:
def supports_stored_procedures(self) -> bool:
return True

@property
def supports_sequences(self) -> bool:
return True
_TERADATA_SELECT_KEYWORDS = frozenset(
{"SELECT", "SEL", "WITH", "SHOW", "DESCRIBE", "EXPLAIN", "HELP"}
)

_LOCKING_RE = re.compile(
r"\bFOR\s+(?:ACCESS|READ|WRITE|EXCLUSIVE)(?:\s+NOWAIT)?\s+(\w+)",
re.IGNORECASE,
)

def classify_query(self, query: str) -> bool:
"""Classify Teradata queries, handling LOCKING/LOCK prefix and SEL abbreviation."""
query_upper = query.strip().upper()
first_word = query_upper.split()[0] if query_upper else ""

# Strip LOCKING/LOCK request modifier to find the actual statement keyword
if first_word in ("LOCKING", "LOCK"):
match = self._LOCKING_RE.search(query_upper)
if match:
first_word = match.group(1)

return first_word in self._TERADATA_SELECT_KEYWORDS

def apply_database_override(self, config: ConnectionConfig, database: str) -> ConnectionConfig:
"""Apply a default database for unqualified queries."""
Expand Down Expand Up @@ -91,8 +109,9 @@ def connect(self, config: ConnectionConfig) -> Any:
def get_databases(self, conn: Any) -> list[str]:
cursor = conn.cursor()
cursor.execute(
"lock row for access "
"SELECT DatabaseName FROM DBC.DatabasesV "
"WHERE DatabaseKind IN ('D', 'U') "
"WHERE dbkind IN ('D', 'U') "
"ORDER BY DatabaseName"
)
return [row[0] for row in cursor.fetchall()]
Expand All @@ -101,13 +120,15 @@ def get_tables(self, conn: Any, database: str | None = None) -> list[TableInfo]:
cursor = conn.cursor()
if database:
cursor.execute(
"lock row for access "
"SELECT DatabaseName, TableName FROM DBC.TablesV "
"WHERE TableKind = 'T' AND DatabaseName = ? "
"ORDER BY TableName",
(database,),
)
else:
cursor.execute(
"lock row for access "
"SELECT DatabaseName, TableName FROM DBC.TablesV "
"WHERE TableKind = 'T' "
"ORDER BY DatabaseName, TableName"
Expand All @@ -118,13 +139,15 @@ def get_views(self, conn: Any, database: str | None = None) -> list[TableInfo]:
cursor = conn.cursor()
if database:
cursor.execute(
"lock row for access "
"SELECT DatabaseName, TableName FROM DBC.TablesV "
"WHERE TableKind = 'V' AND DatabaseName = ? "
"ORDER BY TableName",
(database,),
)
else:
cursor.execute(
"lock row for access "
"SELECT DatabaseName, TableName FROM DBC.TablesV "
"WHERE TableKind = 'V' "
"ORDER BY DatabaseName, TableName"
Expand All @@ -142,21 +165,21 @@ def get_columns(
pk_columns: set[str] = set()
try:
cursor.execute(
"SELECT ic.ColumnName "
"FROM DBC.IndexConstraintsV c "
"JOIN DBC.IndexColumnsV ic "
" ON c.DatabaseName = ic.DatabaseName "
" AND c.TableName = ic.TableName "
" AND c.IndexNumber = ic.IndexNumber "
"WHERE c.ConstraintType = 'P' "
"AND c.DatabaseName = ? AND c.TableName = ?",
"lock row for access "
"select "
"COLUMNNAME "
"from DBC.INDICESV "
"where DATABASENAME = ? "
"and TABLENAME = ? "
"and INDEXTYPE = 'P' ",
(schema_name, table),
)
pk_columns = {row[0] for row in cursor.fetchall()}
except Exception:
pk_columns = set()

cursor.execute(
"lock row for access "
"SELECT ColumnName, ColumnType FROM DBC.ColumnsV "
"WHERE DatabaseName = ? AND TableName = ? "
"ORDER BY ColumnId",
Expand All @@ -171,13 +194,15 @@ def get_procedures(self, conn: Any, database: str | None = None) -> list[str]:
cursor = conn.cursor()
if database:
cursor.execute(
"lock row for access "
"SELECT TableName FROM DBC.TablesV "
"WHERE TableKind = 'P' AND DatabaseName = ? "
"ORDER BY TableName",
(database,),
)
else:
cursor.execute(
"lock row for access "
"SELECT TableName FROM DBC.TablesV "
"WHERE TableKind = 'P' "
"ORDER BY TableName"
Expand All @@ -188,13 +213,15 @@ def get_indexes(self, conn: Any, database: str | None = None) -> list[IndexInfo]
cursor = conn.cursor()
if database:
cursor.execute(
"lock row for access "
"SELECT IndexName, TableName, UniqueFlag FROM DBC.IndicesV "
"WHERE DatabaseName = ? "
"ORDER BY TableName, IndexName",
(database,),
)
else:
cursor.execute(
"lock row for access "
"SELECT IndexName, TableName, UniqueFlag FROM DBC.IndicesV "
"ORDER BY DatabaseName, TableName, IndexName"
)
Expand All @@ -207,33 +234,26 @@ def get_triggers(self, conn: Any, database: str | None = None) -> list[TriggerIn
cursor = conn.cursor()
if database:
cursor.execute(
"lock row for access "
"SELECT TriggerName, TableName FROM DBC.TriggersV "
"WHERE DatabaseName = ? "
"ORDER BY TableName, TriggerName",
(database,),
)
else:
cursor.execute(
"lock row for access "
"SELECT TriggerName, TableName FROM DBC.TriggersV "
"ORDER BY DatabaseName, TableName, TriggerName"
)
return [TriggerInfo(name=row[0], table_name=row[1]) for row in cursor.fetchall()]

def get_sequences(self, conn: Any, database: str | None = None) -> list[SequenceInfo]:
cursor = conn.cursor()
if database:
cursor.execute(
"SELECT SequenceName FROM DBC.SequencesV "
"WHERE DatabaseName = ? "
"ORDER BY SequenceName",
(database,),
)
else:
cursor.execute(
"SELECT SequenceName FROM DBC.SequencesV "
"ORDER BY DatabaseName, SequenceName"
)
return [SequenceInfo(name=row[0]) for row in cursor.fetchall()]
def get_sequences(self, conn: Any, database: str | None = None) -> list[str]:
"""Teradata does not support standalone sequences.

Auto-increment behaviour is provided by IDENTITY columns instead.
"""
return []

def quote_identifier(self, name: str) -> str:
escaped = name.replace('"', '""')
Expand All @@ -242,5 +262,5 @@ def quote_identifier(self, name: str) -> str:
def build_select_query(self, table: str, limit: int, database: str | None = None, schema: str | None = None) -> str:
schema_name = schema or database
if schema_name:
return f'SELECT TOP {limit} * FROM "{schema_name}"."{table}"'
return f'SELECT TOP {limit} * FROM "{table}"'
return f'lock row for access select top {limit} * from "{schema_name}"."{table}"'
return f'lock row for access select top {limit} * from "{table}"'