Implementation:Apache Shardingsphere ShadowOperationType Enum

Knowledge Sources	Apache_Shardingsphere
Domains	Shadow_Testing, SQL_Routing
Last Updated	2026-02-10 00:00 GMT

Overview

Enumeration of SQL operation types used to classify shadow routing decisions.

Description

ShadowOperationType defines the SQL operation categories that shadow algorithms use to determine routing. Values include INSERT, DELETE, UPDATE, SELECT, and HINT_MATCH. The valueFrom static method performs case-insensitive lookup of operation names.

Usage

Use this enum when configuring shadow table rules or implementing custom shadow algorithms that need to match specific SQL operation types.

Code Reference

Source Location

• Repository: Apache_Shardingsphere
• File: features/shadow/api/src/main/java/org/apache/shardingsphere/shadow/spi/ShadowOperationType.java
• Lines: 1-73

Signature

public enum ShadowOperationType {
    INSERT,
    DELETE,
    UPDATE,
    SELECT,
    HINT_MATCH;

    public static Optional<ShadowOperationType> valueFrom(final String name) {
        // Case-insensitive lookup
    }
}

Import

import org.apache.shardingsphere.shadow.spi.ShadowOperationType;

I/O Contract

Inputs

Name	Type	Required	Description
name	String	Yes	Case-insensitive operation type name for valueFrom()

Outputs

Name	Type	Description
valueFrom() returns	Optional<ShadowOperationType>	Matching enum value or empty

Usage Examples

import org.apache.shardingsphere.shadow.spi.ShadowOperationType;

// Resolve operation type from SQL statement type
Optional<ShadowOperationType> opType = ShadowOperationType.valueFrom("INSERT");
// opType.get() == ShadowOperationType.INSERT

// Case-insensitive matching
Optional<ShadowOperationType> selectOp = ShadowOperationType.valueFrom("select");
// selectOp.get() == ShadowOperationType.SELECT

// Non-matching returns empty
Optional<ShadowOperationType> unknown = ShadowOperationType.valueFrom("MERGE");
// unknown.isPresent() == false

Related Pages

• Principle:Apache_Shardingsphere_Shadow_Algorithm_Evaluation