Camel Case

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Java classes are typically camel-cased, while databases often use snake case. Enable mapUnderscoreToCamelCase to convert automatically.

Example 1: convert camel case to snake case

@Table(mapUnderscoreToCamelCase = true)
public class AdminUsers {       // Maps to table admin_users
    private Integer id;         // Maps to column id
    private String  name;       // Maps to column name
    private Integer age;        // Maps to column age
    private Date    createTime; // Maps to column create_time

    // getters and setters omitted
}

Example 2: enable conversion in XML auto-mapping

<!-- entity tag shown; resultMap works the same -->
<entity type="com.example.dto.AdminUsers" mapUnderscoreToCamelCase="true"/>

Scope

Camel-case conversion is off by default; enable it where needed:

• Specific table: set mapUnderscoreToCamelCase on @Table or on <resultMap>/<entity>.
• Mapper file: set it on the mapper root element so all <resultMap>/<entity> inherit it.
• Global: enable via Options at startup or set a default in configuration.