程序包 com.mysql.cj.xdevapi

类 ExprParser

java.lang.Object

com.mysql.cj.xdevapi.ExprParser

public class ExprParser
extends Object

Expression parser for X protocol.

构造器概要

构造器

构造器	说明
ExprParser(String s)	Constructor.
ExprParser(String s, boolean allowRelationalColumns)	Constructor.

方法概要

修饰符和类型	方法	说明
MysqlxExpr.Expr	documentField()	Parse a document field.
List<MysqlxExpr.DocumentPathItem>	documentPath()	Parse a JSON-style document path, like WL#7909, but prefix by @. instead of $.
Map<String,Integer>	getPlaceholderNameToPositionMap()	Get a mapping of parameter names to positions.
int	getPositionalPlaceholderCount()	Return the number of positional placeholders in the expression.
MysqlxExpr.Expr	parse()	Parse the entire string as an expression.
List<MysqlxCrud.Projection>	parseDocumentProjection()	Parse a document projection which is similar to SELECT but with document paths as the target alias.
List<MysqlxExpr.Expr>	parseExprList()	Parse a list of expressions used for GROUP BY.
List<MysqlxCrud.Order>	parseOrderSpec()	Parse an ORDER BY specification which is a comma-separated list of expressions, each may be optionally suffixed by ASC/DESC.
MysqlxCrud.Column	parseTableInsertField()	Parse an INSERT field name.
List<MysqlxCrud.Projection>	parseTableSelectProjection()	Parse a SELECT projection which is a comma-separated list of expressions, each optionally suffixed with a target alias.
MysqlxExpr.ColumnIdentifier	parseTableUpdateField()	Parse an UPDATE field which can include can document paths.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

ExprParser

public ExprParser(String s)

Constructor.

参数:

s - expression string to parse

ExprParser

public ExprParser(String s,
                  boolean allowRelationalColumns)

Constructor.

参数:

s - expression string to parse

allowRelationalColumns - are relational columns identifiers allowed?

方法详细资料

documentPath

public List<MysqlxExpr.DocumentPathItem> documentPath()

Parse a JSON-style document path, like WL#7909, but prefix by @. instead of $.

返回:

list of MysqlxExpr.DocumentPathItem objects

documentField

public MysqlxExpr.Expr documentField()

Parse a document field.

返回:

MysqlxExpr.Expr

parse

public MysqlxExpr.Expr parse()

Parse the entire string as an expression.

返回:

an X protocol expression tree

parseOrderSpec

public List<MysqlxCrud.Order> parseOrderSpec()

Parse an ORDER BY specification which is a comma-separated list of expressions, each may be optionally suffixed by ASC/DESC.

返回:

list of MysqlxCrud.Order objects

parseTableSelectProjection

public List<MysqlxCrud.Projection> parseTableSelectProjection()

Parse a SELECT projection which is a comma-separated list of expressions, each optionally suffixed with a target alias.

返回:

list of MysqlxCrud.Projection objects

parseTableInsertField

public MysqlxCrud.Column parseTableInsertField()

Parse an INSERT field name.

返回:

MysqlxCrud.Column

parseTableUpdateField

public MysqlxExpr.ColumnIdentifier parseTableUpdateField()

Parse an UPDATE field which can include can document paths.

返回:

MysqlxExpr.ColumnIdentifier

parseDocumentProjection

public List<MysqlxCrud.Projection> parseDocumentProjection()

Parse a document projection which is similar to SELECT but with document paths as the target alias.

返回:

list of MysqlxCrud.Projection objects

parseExprList

public List<MysqlxExpr.Expr> parseExprList()

Parse a list of expressions used for GROUP BY.

返回:

list of MysqlxExpr.Expr objects

getPositionalPlaceholderCount

public int getPositionalPlaceholderCount()

Return the number of positional placeholders in the expression.

返回:

the number of positional placeholders in the expression

getPlaceholderNameToPositionMap

public Map<String,Integer> getPlaceholderNameToPositionMap()

Get a mapping of parameter names to positions.

返回:

a mapping of parameter names to positions.