SparkSession.sql() --> AbstractSqlParser.parsePlan() --> AbstractSqlParser.parse() 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /** Creates LogicalPlan for a given SQL string. */ override def parsePlan(sqlText: String): LogicalPlan = parse(sqlText) { parser => val ctx = parse...
def parse(sql, encoding=None):"""Parse sql and return a list of statements.:param sql: A string containing one or more SQL statements.:param encoding: The encoding of the statement (optional).:returns: A tuple of :class:`~sqlparse.sql.Statement` instances."""return tuple(parsestream(sql...
class Statement(TokenList):"""Represents a SQL statement."""def get_type(self):"""Returns the type of a statement.The returned value is a string holding an upper-cased reprint ofthe first DML or DDL keyword. If the first token in this groupisn't a DML or DDL keyword "UNKNOWN" is ...
:param sql: A string containing one or more SQL statements. :param encoding: The encoding of the statement (optional). :returns: A tuple of :class:`~sqlparse.sql.Statement` instances. """ return tuple(parsestream(sql, encoding)) 1. 2. 3. 4. 5. 6. 7. 传入一个SQL语句,返回一个 s...
Returns the result of an expression, translated to the requested data type in SQL Server. Transact-SQL syntax conventions Syntax syntaxsql PARSE(string_valueASdata_type[USINGculture ] ) Arguments string_value nvarchar(4000) value representing the formatted value to parse into the specified data type...
Apache ShardingSphere 的 SQLParserEngine 是对 ANTLR4 解析的封装和抽象,它会通过 SPI 的方式来加载数据库方言的解析器,用户可以通过 SPI 扩展点对数据方言进行进一步扩展。另外内部还增加了缓存机制,用来提高性能。我们着重来看一下解析的相关代码。 publicParseContextparse(finalString sql){ParseASTNoderesult=two...
Returns the result of an expression, translated to the requested data type in SQL Server. Transact-SQL syntax conventions Syntax syntaxsql PARSE(string_valueASdata_type[USINGculture ] ) Arguments string_value nvarchar(4000) value representing the formatted value to parse into the specified data type...
query_string = "param1=value1¶m2=value2¶m3=value3" parsed_query = parse_qsl(query_string) 更改参数的值:遍历解析后的查询字符串列表,并找到需要更改值的参数。然后,使用索引或其他方法将新值分配给该参数。 代码语言:txt 复制 for i, (param, value) in enumerate(parsed_query): if param ...
json json_parse(<string>) 参数说明 string:必填,待处理的STRING字符串。 返回值说明 返回JSON类型。 使用示例 示例1:字符串转换为JSON类型。 select json_parse('{"a":1, "b":2}'); 返回结果: +---+ | _c0 | +---+ | {"a":1,"b":2} | +---+ 示例2:字符串转换为JSON类型。 select ...
274 i.e. a Common Table Expression (CTE, or Query Name in SQL99 terms). 275*/ 276class PT_common_table_expr : public Parse_tree_node { 277 typedef Parse_tree_node super; 278 279 public: 280 explicit PT_common_table_expr(const POS &pos, const LEX_STRING &name, 281 const LEX_ST...