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sqlglot.dialects.sqlite

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  1from __future__ import annotations
  2
  3from sqlglot import exp, generator, parser, tokens, transforms
  4from sqlglot.dialects.dialect import (
  5    Dialect,
  6    arrow_json_extract_scalar_sql,
  7    arrow_json_extract_sql,
  8    count_if_to_sum,
  9    no_ilike_sql,
 10    no_tablesample_sql,
 11    no_trycast_sql,
 12    rename_func,
 13)
 14from sqlglot.tokens import TokenType
 15
 16
 17def _date_add_sql(self, expression):
 18    modifier = expression.expression
 19    modifier = expression.name if modifier.is_string else self.sql(modifier)
 20    unit = expression.args.get("unit")
 21    modifier = f"'{modifier} {unit.name}'" if unit else f"'{modifier}'"
 22    return self.func("DATE", expression.this, modifier)
 23
 24
 25class SQLite(Dialect):
 26    class Tokenizer(tokens.Tokenizer):
 27        IDENTIFIERS = ['"', ("[", "]"), "`"]
 28        HEX_STRINGS = [("x'", "'"), ("X'", "'"), ("0x", ""), ("0X", "")]
 29
 30        KEYWORDS = {
 31            **tokens.Tokenizer.KEYWORDS,
 32        }
 33
 34    class Parser(parser.Parser):
 35        FUNCTIONS = {
 36            **parser.Parser.FUNCTIONS,  # type: ignore
 37            "EDITDIST3": exp.Levenshtein.from_arg_list,
 38        }
 39
 40    class Generator(generator.Generator):
 41        TYPE_MAPPING = {
 42            **generator.Generator.TYPE_MAPPING,  # type: ignore
 43            exp.DataType.Type.BOOLEAN: "INTEGER",
 44            exp.DataType.Type.TINYINT: "INTEGER",
 45            exp.DataType.Type.SMALLINT: "INTEGER",
 46            exp.DataType.Type.INT: "INTEGER",
 47            exp.DataType.Type.BIGINT: "INTEGER",
 48            exp.DataType.Type.FLOAT: "REAL",
 49            exp.DataType.Type.DOUBLE: "REAL",
 50            exp.DataType.Type.DECIMAL: "REAL",
 51            exp.DataType.Type.CHAR: "TEXT",
 52            exp.DataType.Type.NCHAR: "TEXT",
 53            exp.DataType.Type.VARCHAR: "TEXT",
 54            exp.DataType.Type.NVARCHAR: "TEXT",
 55            exp.DataType.Type.BINARY: "BLOB",
 56            exp.DataType.Type.VARBINARY: "BLOB",
 57        }
 58
 59        TOKEN_MAPPING = {
 60            TokenType.AUTO_INCREMENT: "AUTOINCREMENT",
 61        }
 62
 63        TRANSFORMS = {
 64            **generator.Generator.TRANSFORMS,  # type: ignore
 65            **transforms.ELIMINATE_QUALIFY,  # type: ignore
 66            exp.CountIf: count_if_to_sum,
 67            exp.CurrentDate: lambda *_: "CURRENT_DATE",
 68            exp.CurrentTime: lambda *_: "CURRENT_TIME",
 69            exp.CurrentTimestamp: lambda *_: "CURRENT_TIMESTAMP",
 70            exp.DateAdd: _date_add_sql,
 71            exp.DateStrToDate: lambda self, e: self.sql(e, "this"),
 72            exp.ILike: no_ilike_sql,
 73            exp.JSONExtract: arrow_json_extract_sql,
 74            exp.JSONExtractScalar: arrow_json_extract_scalar_sql,
 75            exp.JSONBExtract: arrow_json_extract_sql,
 76            exp.JSONBExtractScalar: arrow_json_extract_scalar_sql,
 77            exp.Levenshtein: rename_func("EDITDIST3"),
 78            exp.LogicalOr: rename_func("MAX"),
 79            exp.LogicalAnd: rename_func("MIN"),
 80            exp.TableSample: no_tablesample_sql,
 81            exp.TimeStrToTime: lambda self, e: self.sql(e, "this"),
 82            exp.TryCast: no_trycast_sql,
 83        }
 84
 85        LIMIT_FETCH = "LIMIT"
 86
 87        def cast_sql(self, expression: exp.Cast) -> str:
 88            if expression.to.this == exp.DataType.Type.DATE:
 89                return self.func("DATE", expression.this)
 90
 91            return super().cast_sql(expression)
 92
 93        def datediff_sql(self, expression: exp.DateDiff) -> str:
 94            unit = expression.args.get("unit")
 95            unit = unit.name.upper() if unit else "DAY"
 96
 97            sql = f"(JULIANDAY({self.sql(expression, 'this')}) - JULIANDAY({self.sql(expression, 'expression')}))"
 98
 99            if unit == "MONTH":
100                sql = f"{sql} / 30.0"
101            elif unit == "YEAR":
102                sql = f"{sql} / 365.0"
103            elif unit == "HOUR":
104                sql = f"{sql} * 24.0"
105            elif unit == "MINUTE":
106                sql = f"{sql} * 1440.0"
107            elif unit == "SECOND":
108                sql = f"{sql} * 86400.0"
109            elif unit == "MILLISECOND":
110                sql = f"{sql} * 86400000.0"
111            elif unit == "MICROSECOND":
112                sql = f"{sql} * 86400000000.0"
113            elif unit == "NANOSECOND":
114                sql = f"{sql} * 8640000000000.0"
115            else:
116                self.unsupported("DATEDIFF unsupported for '{unit}'.")
117
118            return f"CAST({sql} AS INTEGER)"
119
120        # https://www.sqlite.org/lang_aggfunc.html#group_concat
121        def groupconcat_sql(self, expression):
122            this = expression.this
123            distinct = expression.find(exp.Distinct)
124            if distinct:
125                this = distinct.expressions[0]
126                distinct = "DISTINCT "
127
128            if isinstance(expression.this, exp.Order):
129                self.unsupported("SQLite GROUP_CONCAT doesn't support ORDER BY.")
130                if expression.this.this and not distinct:
131                    this = expression.this.this
132
133            separator = expression.args.get("separator")
134            return f"GROUP_CONCAT({distinct or ''}{self.format_args(this, separator)})"
135
136        def least_sql(self, expression: exp.Least) -> str:
137            if len(expression.expressions) > 1:
138                return rename_func("MIN")(self, expression)
139
140            return self.expressions(expression)
141
142        def transaction_sql(self, expression: exp.Transaction) -> str:
143            this = expression.this
144            this = f" {this}" if this else ""
145            return f"BEGIN{this} TRANSACTION"

class SQLite(sqlglot.dialects.dialect.Dialect): View Source

 26class SQLite(Dialect):
 27    class Tokenizer(tokens.Tokenizer):
 28        IDENTIFIERS = ['"', ("[", "]"), "`"]
 29        HEX_STRINGS = [("x'", "'"), ("X'", "'"), ("0x", ""), ("0X", "")]
 30
 31        KEYWORDS = {
 32            **tokens.Tokenizer.KEYWORDS,
 33        }
 34
 35    class Parser(parser.Parser):
 36        FUNCTIONS = {
 37            **parser.Parser.FUNCTIONS,  # type: ignore
 38            "EDITDIST3": exp.Levenshtein.from_arg_list,
 39        }
 40
 41    class Generator(generator.Generator):
 42        TYPE_MAPPING = {
 43            **generator.Generator.TYPE_MAPPING,  # type: ignore
 44            exp.DataType.Type.BOOLEAN: "INTEGER",
 45            exp.DataType.Type.TINYINT: "INTEGER",
 46            exp.DataType.Type.SMALLINT: "INTEGER",
 47            exp.DataType.Type.INT: "INTEGER",
 48            exp.DataType.Type.BIGINT: "INTEGER",
 49            exp.DataType.Type.FLOAT: "REAL",
 50            exp.DataType.Type.DOUBLE: "REAL",
 51            exp.DataType.Type.DECIMAL: "REAL",
 52            exp.DataType.Type.CHAR: "TEXT",
 53            exp.DataType.Type.NCHAR: "TEXT",
 54            exp.DataType.Type.VARCHAR: "TEXT",
 55            exp.DataType.Type.NVARCHAR: "TEXT",
 56            exp.DataType.Type.BINARY: "BLOB",
 57            exp.DataType.Type.VARBINARY: "BLOB",
 58        }
 59
 60        TOKEN_MAPPING = {
 61            TokenType.AUTO_INCREMENT: "AUTOINCREMENT",
 62        }
 63
 64        TRANSFORMS = {
 65            **generator.Generator.TRANSFORMS,  # type: ignore
 66            **transforms.ELIMINATE_QUALIFY,  # type: ignore
 67            exp.CountIf: count_if_to_sum,
 68            exp.CurrentDate: lambda *_: "CURRENT_DATE",
 69            exp.CurrentTime: lambda *_: "CURRENT_TIME",
 70            exp.CurrentTimestamp: lambda *_: "CURRENT_TIMESTAMP",
 71            exp.DateAdd: _date_add_sql,
 72            exp.DateStrToDate: lambda self, e: self.sql(e, "this"),
 73            exp.ILike: no_ilike_sql,
 74            exp.JSONExtract: arrow_json_extract_sql,
 75            exp.JSONExtractScalar: arrow_json_extract_scalar_sql,
 76            exp.JSONBExtract: arrow_json_extract_sql,
 77            exp.JSONBExtractScalar: arrow_json_extract_scalar_sql,
 78            exp.Levenshtein: rename_func("EDITDIST3"),
 79            exp.LogicalOr: rename_func("MAX"),
 80            exp.LogicalAnd: rename_func("MIN"),
 81            exp.TableSample: no_tablesample_sql,
 82            exp.TimeStrToTime: lambda self, e: self.sql(e, "this"),
 83            exp.TryCast: no_trycast_sql,
 84        }
 85
 86        LIMIT_FETCH = "LIMIT"
 87
 88        def cast_sql(self, expression: exp.Cast) -> str:
 89            if expression.to.this == exp.DataType.Type.DATE:
 90                return self.func("DATE", expression.this)
 91
 92            return super().cast_sql(expression)
 93
 94        def datediff_sql(self, expression: exp.DateDiff) -> str:
 95            unit = expression.args.get("unit")
 96            unit = unit.name.upper() if unit else "DAY"
 97
 98            sql = f"(JULIANDAY({self.sql(expression, 'this')}) - JULIANDAY({self.sql(expression, 'expression')}))"
 99
100            if unit == "MONTH":
101                sql = f"{sql} / 30.0"
102            elif unit == "YEAR":
103                sql = f"{sql} / 365.0"
104            elif unit == "HOUR":
105                sql = f"{sql} * 24.0"
106            elif unit == "MINUTE":
107                sql = f"{sql} * 1440.0"
108            elif unit == "SECOND":
109                sql = f"{sql} * 86400.0"
110            elif unit == "MILLISECOND":
111                sql = f"{sql} * 86400000.0"
112            elif unit == "MICROSECOND":
113                sql = f"{sql} * 86400000000.0"
114            elif unit == "NANOSECOND":
115                sql = f"{sql} * 8640000000000.0"
116            else:
117                self.unsupported("DATEDIFF unsupported for '{unit}'.")
118
119            return f"CAST({sql} AS INTEGER)"
120
121        # https://www.sqlite.org/lang_aggfunc.html#group_concat
122        def groupconcat_sql(self, expression):
123            this = expression.this
124            distinct = expression.find(exp.Distinct)
125            if distinct:
126                this = distinct.expressions[0]
127                distinct = "DISTINCT "
128
129            if isinstance(expression.this, exp.Order):
130                self.unsupported("SQLite GROUP_CONCAT doesn't support ORDER BY.")
131                if expression.this.this and not distinct:
132                    this = expression.this.this
133
134            separator = expression.args.get("separator")
135            return f"GROUP_CONCAT({distinct or ''}{self.format_args(this, separator)})"
136
137        def least_sql(self, expression: exp.Least) -> str:
138            if len(expression.expressions) > 1:
139                return rename_func("MIN")(self, expression)
140
141            return self.expressions(expression)
142
143        def transaction_sql(self, expression: exp.Transaction) -> str:
144            this = expression.this
145            this = f" {this}" if this else ""
146            return f"BEGIN{this} TRANSACTION"

Inherited Members

sqlglot.dialects.dialect.Dialect: get_or_raise; format_time; parse; parse_into; generate; transpile; tokenize; parser; generator

class SQLite.Tokenizer(sqlglot.tokens.Tokenizer): View Source

27    class Tokenizer(tokens.Tokenizer):
28        IDENTIFIERS = ['"', ("[", "]"), "`"]
29        HEX_STRINGS = [("x'", "'"), ("X'", "'"), ("0x", ""), ("0X", "")]
30
31        KEYWORDS = {
32            **tokens.Tokenizer.KEYWORDS,
33        }

Inherited Members

sqlglot.tokens.Tokenizer: reset; tokenize

class SQLite.Parser(sqlglot.parser.Parser): View Source

35    class Parser(parser.Parser):
36        FUNCTIONS = {
37            **parser.Parser.FUNCTIONS,  # type: ignore
38            "EDITDIST3": exp.Levenshtein.from_arg_list,
39        }

Parser consumes a list of tokens produced by the sqlglot.tokens.Tokenizer and produces a parsed syntax tree.

Arguments:

error_level: the desired error level. Default: ErrorLevel.RAISE
error_message_context: determines the amount of context to capture from a query string when displaying the error message (in number of characters). Default: 50.
index_offset: Index offset for arrays eg ARRAY[0] vs ARRAY[1] as the head of a list. Default: 0
alias_post_tablesample: If the table alias comes after tablesample. Default: False
max_errors: Maximum number of error messages to include in a raised ParseError. This is only relevant if error_level is ErrorLevel.RAISE. Default: 3
null_ordering: Indicates the default null ordering method to use if not explicitly set. Options are "nulls_are_small", "nulls_are_large", "nulls_are_last". Default: "nulls_are_small"

Inherited Members

sqlglot.parser.Parser: Parser; reset; parse; parse_into; check_errors; raise_error; expression; validate_expression

class SQLite.Generator(sqlglot.generator.Generator): View Source

 41    class Generator(generator.Generator):
 42        TYPE_MAPPING = {
 43            **generator.Generator.TYPE_MAPPING,  # type: ignore
 44            exp.DataType.Type.BOOLEAN: "INTEGER",
 45            exp.DataType.Type.TINYINT: "INTEGER",
 46            exp.DataType.Type.SMALLINT: "INTEGER",
 47            exp.DataType.Type.INT: "INTEGER",
 48            exp.DataType.Type.BIGINT: "INTEGER",
 49            exp.DataType.Type.FLOAT: "REAL",
 50            exp.DataType.Type.DOUBLE: "REAL",
 51            exp.DataType.Type.DECIMAL: "REAL",
 52            exp.DataType.Type.CHAR: "TEXT",
 53            exp.DataType.Type.NCHAR: "TEXT",
 54            exp.DataType.Type.VARCHAR: "TEXT",
 55            exp.DataType.Type.NVARCHAR: "TEXT",
 56            exp.DataType.Type.BINARY: "BLOB",
 57            exp.DataType.Type.VARBINARY: "BLOB",
 58        }
 59
 60        TOKEN_MAPPING = {
 61            TokenType.AUTO_INCREMENT: "AUTOINCREMENT",
 62        }
 63
 64        TRANSFORMS = {
 65            **generator.Generator.TRANSFORMS,  # type: ignore
 66            **transforms.ELIMINATE_QUALIFY,  # type: ignore
 67            exp.CountIf: count_if_to_sum,
 68            exp.CurrentDate: lambda *_: "CURRENT_DATE",
 69            exp.CurrentTime: lambda *_: "CURRENT_TIME",
 70            exp.CurrentTimestamp: lambda *_: "CURRENT_TIMESTAMP",
 71            exp.DateAdd: _date_add_sql,
 72            exp.DateStrToDate: lambda self, e: self.sql(e, "this"),
 73            exp.ILike: no_ilike_sql,
 74            exp.JSONExtract: arrow_json_extract_sql,
 75            exp.JSONExtractScalar: arrow_json_extract_scalar_sql,
 76            exp.JSONBExtract: arrow_json_extract_sql,
 77            exp.JSONBExtractScalar: arrow_json_extract_scalar_sql,
 78            exp.Levenshtein: rename_func("EDITDIST3"),
 79            exp.LogicalOr: rename_func("MAX"),
 80            exp.LogicalAnd: rename_func("MIN"),
 81            exp.TableSample: no_tablesample_sql,
 82            exp.TimeStrToTime: lambda self, e: self.sql(e, "this"),
 83            exp.TryCast: no_trycast_sql,
 84        }
 85
 86        LIMIT_FETCH = "LIMIT"
 87
 88        def cast_sql(self, expression: exp.Cast) -> str:
 89            if expression.to.this == exp.DataType.Type.DATE:
 90                return self.func("DATE", expression.this)
 91
 92            return super().cast_sql(expression)
 93
 94        def datediff_sql(self, expression: exp.DateDiff) -> str:
 95            unit = expression.args.get("unit")
 96            unit = unit.name.upper() if unit else "DAY"
 97
 98            sql = f"(JULIANDAY({self.sql(expression, 'this')}) - JULIANDAY({self.sql(expression, 'expression')}))"
 99
100            if unit == "MONTH":
101                sql = f"{sql} / 30.0"
102            elif unit == "YEAR":
103                sql = f"{sql} / 365.0"
104            elif unit == "HOUR":
105                sql = f"{sql} * 24.0"
106            elif unit == "MINUTE":
107                sql = f"{sql} * 1440.0"
108            elif unit == "SECOND":
109                sql = f"{sql} * 86400.0"
110            elif unit == "MILLISECOND":
111                sql = f"{sql} * 86400000.0"
112            elif unit == "MICROSECOND":
113                sql = f"{sql} * 86400000000.0"
114            elif unit == "NANOSECOND":
115                sql = f"{sql} * 8640000000000.0"
116            else:
117                self.unsupported("DATEDIFF unsupported for '{unit}'.")
118
119            return f"CAST({sql} AS INTEGER)"
120
121        # https://www.sqlite.org/lang_aggfunc.html#group_concat
122        def groupconcat_sql(self, expression):
123            this = expression.this
124            distinct = expression.find(exp.Distinct)
125            if distinct:
126                this = distinct.expressions[0]
127                distinct = "DISTINCT "
128
129            if isinstance(expression.this, exp.Order):
130                self.unsupported("SQLite GROUP_CONCAT doesn't support ORDER BY.")
131                if expression.this.this and not distinct:
132                    this = expression.this.this
133
134            separator = expression.args.get("separator")
135            return f"GROUP_CONCAT({distinct or ''}{self.format_args(this, separator)})"
136
137        def least_sql(self, expression: exp.Least) -> str:
138            if len(expression.expressions) > 1:
139                return rename_func("MIN")(self, expression)
140
141            return self.expressions(expression)
142
143        def transaction_sql(self, expression: exp.Transaction) -> str:
144            this = expression.this
145            this = f" {this}" if this else ""
146            return f"BEGIN{this} TRANSACTION"

Generator interprets the given syntax tree and produces a SQL string as an output.

Arguments:

time_mapping (dict): the dictionary of custom time mappings in which the key represents a python time format and the output the target time format
time_trie (trie): a trie of the time_mapping keys
pretty (bool): if set to True the returned string will be formatted. Default: False.
quote_start (str): specifies which starting character to use to delimit quotes. Default: '.
quote_end (str): specifies which ending character to use to delimit quotes. Default: '.
identifier_start (str): specifies which starting character to use to delimit identifiers. Default: ".
identifier_end (str): specifies which ending character to use to delimit identifiers. Default: ".
identify (bool | str): 'always': always quote, 'safe': quote identifiers if they don't contain an upcase, True defaults to always.
normalize (bool): if set to True all identifiers will lower cased
string_escape (str): specifies a string escape character. Default: '.
identifier_escape (str): specifies an identifier escape character. Default: ".
pad (int): determines padding in a formatted string. Default: 2.
indent (int): determines the size of indentation in a formatted string. Default: 4.
unnest_column_only (bool): if true unnest table aliases are considered only as column aliases
normalize_functions (str): normalize function names, "upper", "lower", or None Default: "upper"
alias_post_tablesample (bool): if the table alias comes after tablesample Default: False
unsupported_level (ErrorLevel): determines the generator's behavior when it encounters unsupported expressions. Default ErrorLevel.WARN.
null_ordering (str): Indicates the default null ordering method to use if not explicitly set. Options are "nulls_are_small", "nulls_are_large", "nulls_are_last". Default: "nulls_are_small"
max_unsupported (int): Maximum number of unsupported messages to include in a raised UnsupportedError. This is only relevant if unsupported_level is ErrorLevel.RAISE. Default: 3
leading_comma (bool): if the the comma is leading or trailing in select statements Default: False
max_text_width: The max number of characters in a segment before creating new lines in pretty mode. The default is on the smaller end because the length only represents a segment and not the true line length. Default: 80
comments: Whether or not to preserve comments in the output SQL code. Default: True

def cast_sql(self, expression: sqlglot.expressions.Cast) -> str: View Source

88        def cast_sql(self, expression: exp.Cast) -> str:
89            if expression.to.this == exp.DataType.Type.DATE:
90                return self.func("DATE", expression.this)
91
92            return super().cast_sql(expression)

def datediff_sql(self, expression: sqlglot.expressions.DateDiff) -> str: View Source

 94        def datediff_sql(self, expression: exp.DateDiff) -> str:
 95            unit = expression.args.get("unit")
 96            unit = unit.name.upper() if unit else "DAY"
 97
 98            sql = f"(JULIANDAY({self.sql(expression, 'this')}) - JULIANDAY({self.sql(expression, 'expression')}))"
 99
100            if unit == "MONTH":
101                sql = f"{sql} / 30.0"
102            elif unit == "YEAR":
103                sql = f"{sql} / 365.0"
104            elif unit == "HOUR":
105                sql = f"{sql} * 24.0"
106            elif unit == "MINUTE":
107                sql = f"{sql} * 1440.0"
108            elif unit == "SECOND":
109                sql = f"{sql} * 86400.0"
110            elif unit == "MILLISECOND":
111                sql = f"{sql} * 86400000.0"
112            elif unit == "MICROSECOND":
113                sql = f"{sql} * 86400000000.0"
114            elif unit == "NANOSECOND":
115                sql = f"{sql} * 8640000000000.0"
116            else:
117                self.unsupported("DATEDIFF unsupported for '{unit}'.")
118
119            return f"CAST({sql} AS INTEGER)"

def groupconcat_sql(self, expression): View Source

122        def groupconcat_sql(self, expression):
123            this = expression.this
124            distinct = expression.find(exp.Distinct)
125            if distinct:
126                this = distinct.expressions[0]
127                distinct = "DISTINCT "
128
129            if isinstance(expression.this, exp.Order):
130                self.unsupported("SQLite GROUP_CONCAT doesn't support ORDER BY.")
131                if expression.this.this and not distinct:
132                    this = expression.this.this
133
134            separator = expression.args.get("separator")
135            return f"GROUP_CONCAT({distinct or ''}{self.format_args(this, separator)})"

def least_sql(self, expression: sqlglot.expressions.Least) -> str: View Source

137        def least_sql(self, expression: exp.Least) -> str:
138            if len(expression.expressions) > 1:
139                return rename_func("MIN")(self, expression)
140
141            return self.expressions(expression)

def transaction_sql(self, expression: sqlglot.expressions.Transaction) -> str: View Source

143        def transaction_sql(self, expression: exp.Transaction) -> str:
144            this = expression.this
145            this = f" {this}" if this else ""
146            return f"BEGIN{this} TRANSACTION"

Inherited Members

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