SQLNullExpr (druid 1.2.26 API)

java.lang.Object
- com.alibaba.druid.sql.ast.SQLObjectImpl
- - com.alibaba.druid.sql.ast.SQLExprImpl
  - - com.alibaba.druid.sql.ast.expr.SQLNullExpr

All Implemented Interfaces:: SQLLiteralExpr, SQLValuableExpr, SQLExpr, SQLObject, Cloneable

public final class SQLNullExpr
extends SQLExprImpl
implements SQLLiteralExpr, SQLValuableExpr

Field Summary
- Fields inherited from class com.alibaba.druid.sql.ast.SQLExprImpl
  parenthesized, parenthesizedCount
- Fields inherited from class com.alibaba.druid.sql.ast.SQLObjectImpl
  attributes, hint, parent, sourceColumn, sourceLine

Constructor Summary

Constructors
Constructor Description

SQLNullExpr()

SQLNullExpr(SQLObject parent)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`accept0(SQLASTVisitor visitor)`
`SQLNullExpr`	`clone()`
`boolean`	`equals(Object o)`
`List`	`getChildren()`
`Object`	`getValue()`
`int`	`hashCode()`
`void`	`output(StringBuilder buf)`

Methods inherited from class com.alibaba.druid.sql.ast.SQLExprImpl
cloneTo, computeDataType, getParenthesizedCount, increaseParenthesizedCount, isParenthesized, setParenthesized, setParenthesizedCount

Methods inherited from class com.alibaba.druid.sql.ast.SQLObjectImpl
accept, acceptChild, acceptChild, addAfterComment, addAfterComment, addBeforeComment, addBeforeComment, cloneTo, containsAttribute, getAfterCommentsDirect, getAttribute, getAttributes, getAttributesDirect, getBeforeCommentsDirect, getHint, getParent, getParent, getSourceColumn, getSourceLine, hasAfterComment, hasBeforeComment, putAttribute, setHint, setParent, setSource, setSourceLine, toString

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.alibaba.druid.sql.ast.SQLExpr
computeDataType, getHint

Methods inherited from interface com.alibaba.druid.sql.ast.SQLObject
accept, addAfterComment, addAfterComment, addBeforeComment, addBeforeComment, containsAttribute, getAfterCommentsDirect, getAttribute, getAttributes, getAttributesDirect, getBeforeCommentsDirect, getParent, getParent, getSourceColumn, getSourceLine, hasAfterComment, hasBeforeComment, putAttribute, setParent, setSource

- Constructor Detail
  - SQLNullExpr
```
public SQLNullExpr()
```
  - SQLNullExpr
```
public SQLNullExpr(SQLObject parent)
```
- Method Detail
  - output
```
public void output(StringBuilder buf)
```
    Specified by:
    
    output in interface SQLObject
    
    Overrides:
    
    output in class SQLObjectImpl
  - accept0
```
protected void accept0(SQLASTVisitor visitor)
```
    Specified by:
    
    accept0 in class SQLObjectImpl
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in class SQLExprImpl
  - equals
```
public boolean equals(Object o)
```
    Specified by:
    
    equals in class SQLExprImpl
  - getValue
```
public Object getValue()
```
    Specified by:
    
    getValue in interface SQLValuableExpr
  - clone
```
public SQLNullExpr clone()
```
    Specified by:
    
    clone in interface SQLExpr
    
    Specified by:
    
    clone in interface SQLLiteralExpr
    
    Specified by:
    
    clone in interface SQLObject
    
    Specified by:
    
    clone in class SQLExprImpl
  - getChildren
```
public List getChildren()
```
    Specified by:
    
    getChildren in interface SQLExpr
    
    Overrides:
    
    getChildren in class SQLExprImpl