SQL parser 将SQL语法转化为AST, 可以通过Antlr4 Visitor模式实现,核心Parse逻辑如下: public class SqlParser { public Statement createStatement(String sql) { return (Statement) invokeParser("statement", sql, SparrowSQLParser::singleStatement); } private Node invokeParser(String name, String sql, Function...
复制 StringdbType=JdbcConstants.MYSQL;List<SQLStatement>statementList=SQLUtils.parseStatements(sql,dbType); 1. 2. SQLUtils的parseStatements方法会把你传入的SQL语句给解析成SQLStatement对象集合,每一个SQLStatement代表一条完整的SQL语句,如: 复制 SELECTidFROMuserWHEREstatus=1 1. 多个SQLStatement,如: 复制 ...
String dbType =JdbcConstants.MYSQL; List<SQLStatement> statementList = SQLUtils.parseStatements(sql, dbType); SQLUtils的parseStatements方法会把你传入的SQL语句给解析成SQLStatement对象集合,每一个SQLStatement代表一条完整的SQL语句,如: SELECTidFROMuserWHEREstatus=1 多个SQLStatement如: SELECTidFROMuserWHEREs...
// 代码1val spark=SparkSession.builder.appName("SparkSQL Test").master("local[4]").getOrCreate()spark.sql("select * from table").show(false)---// 代码2defsql(sqlText:String):DataFrame={Dataset.ofRows(self,sessionState.sqlParser.parsePlan(sqlText))}---// 代码3override defparsePlan(...
parse(sql_5); if (statement instanceof CreateTable) { Table table = ((CreateTable) statement).getTable(); System.out.println(table); Select select = ((CreateTable) statement).getSelect(); if (select != null){ String s = select.toString(); testSimpleSelectSql(s); } } } catch (...
1.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(parse...
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...
input 型別:System.IO.TextReader 要剖析的指令碼。errors 型別:System.Collections.Generic.IList<ParseError>% (輸出)解析錯誤。傳回值型別:Microsoft.Data.Schema.ScriptDom.IScriptFragment 指令碼片段。.NET Framework 安全性完全信任立即呼叫者。這個成員無法供部分信任的程式碼使用。如需詳細資訊,請參閱從部分...
def sql(sqlText: String): DataFrame = withActive { val tracker = new QueryPlanningTracker val plan = tracker.measurePhase(QueryPlanningTracker.PARSING) { sessionState.sqlParser.parsePlan(sqlText) } Dataset.ofRows(self, plan, tracker)
("max", "最大值"), MIN("min", "最小值"), AVG("avg", "平均值"), SUM("sum", "求和"), ; private final String value; private final String name; /** * 根据值获取枚举 * * @param value 值 * @return {@link AggregationType} */ public static AggregationType findByValue(String ...