EResolverType (General SQL Parser Java Library Core 4.1.0.5 API)

Object
- Enum<EResolverType>
- - gudusoft.gsqlparser.EResolverType

All Implemented Interfaces:

Serializable, Comparable<EResolverType>
```
public enum EResolverType
extends Enum<EResolverType>
```
Specifies which SQL resolver to use for name resolution during parsing.
The resolver is responsible for linking column references to their source tables and performing semantic analysis after parsing.

Usage Example:
```
 TGSqlParser parser = new TGSqlParser(EDbVendor.dbvoracle);
 parser.setResolverType(EResolverType.RESOLVER2);  // Use new resolver
 parser.sqltext = "SELECT * FROM employees";
 parser.parse();

 // Access resolver2 results
 TSQLResolver2 resolver = parser.getResolver2();
 
```
Precedence:

Instance-level setting (setResolverType) takes precedence over global TBaseType settings. When set to DEFAULT, the behavior is determined by TBaseType.isEnableResolver() and TBaseType.isEnableResolver2().
See Also:

TGSqlParser.setResolverType(EResolverType), TBaseType.setEnableResolver(boolean), TBaseType.setEnableResolver2(boolean)

Enum Constant Summary

Enum Constants
Enum Constant and Description
`DEFAULT` Use global TBaseType settings to determine which resolver to use.
`NONE` Disable name resolution entirely.
`RESOLVER` Use the original TSQLResolver for name resolution.
`RESOLVER2` Use the new TSQLResolver2 for name resolution.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static EResolverType`	`valueOf(String name)` Returns the enum constant of this type with the specified name.
`static EResolverType[]`	`values()` Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class Object
getClass, notify, notifyAll, wait, wait, wait

- Enum Constant Detail
  - DEFAULT
```
public static final EResolverType DEFAULT
```
    Use global TBaseType settings to determine which resolver to use. This is the default behavior for backward compatibility.
    Resolution order:
    1. If TBaseType.isEnableResolver2() is true, use RESOLVER2
    2. Else if TBaseType.isEnableResolver() is true, use RESOLVER
    3. Else use NONE (no resolution)
  - RESOLVER
```
public static final EResolverType RESOLVER
```
    Use the original TSQLResolver for name resolution. This is the legacy resolver that has been available since early versions.
  - RESOLVER2
```
public static final EResolverType RESOLVER2
```
    Use the new TSQLResolver2 for name resolution.
    TSQLResolver2 provides improved column-to-table resolution with:
    - Clear scope-based name resolution
    - Full candidate collection for ambiguous cases
    - Confidence-scored inference
    - Better tracing and debugging
    - CTE and subquery support
    After parsing, access the resolver via TGSqlParser.getResolver2().
  - NONE
```
public static final EResolverType NONE
```
    Disable name resolution entirely. Only parsing will be performed, no semantic analysis.
    Use this when you only need the AST structure and don't need column-to-table relationships resolved.
- Method Detail
  - values
```
public static EResolverType[] values()
```
    Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
```
for (EResolverType c : EResolverType.values())
    System.out.println(c);
```
    Returns:
    
    an array containing the constants of this enum type, in the order they are declared
  - valueOf
```
public static EResolverType valueOf(String name)
```
    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
    
    Parameters:
    
    name - the name of the enum constant to be returned.
    
    Returns:
    
    the enum constant with the specified name
    
    Throws:
    
    IllegalArgumentException - if this enum type has no constant with the specified name
    
    NullPointerException - if the argument is null

Enum EResolverType

Usage Example:

Precedence:

Enum Constant Summary

Method Summary

Methods inherited from class Enum

Methods inherited from class Object

Enum Constant Detail

DEFAULT

RESOLVER

RESOLVER2

NONE

Method Detail

values

valueOf