T
- the result typepublic class DataClassRowMapper<T> extends BeanPropertyRowMapper<T>
RowMapper
implementation that converts a row into a new instance
of the specified mapped target class. The mapped target class must be a
top-level class or static
nested class, and it may expose either a
data class constructor with named parameters corresponding to column
names or classic bean property setter methods with property names corresponding
to column names (or even a combination of both).
The term "data class" applies to Java records, Kotlin data classes, and any class which has a constructor with named parameters that are intended to be mapped to corresponding column names.
When combining a data class constructor with setter methods, any property mapped successfully via a constructor argument will not be mapped additionally via a corresponding setter method. This means that constructor arguments take precedence over property setter methods.
Note that this class extends BeanPropertyRowMapper
and can
therefore serve as a common choice for any mapped target class, flexibly
adapting to constructor style versus setter methods in the mapped class.
Please note that this class is designed to provide convenience rather than
high performance. For best performance, consider using a custom RowMapper
implementation.
logger
Constructor and Description |
---|
DataClassRowMapper()
Create a new
DataClassRowMapper for bean-style configuration. |
DataClassRowMapper(Class<T> mappedClass)
Create a new
DataClassRowMapper . |
Modifier and Type | Method and Description |
---|---|
protected T |
constructMappedInstance(ResultSet rs,
TypeConverter tc)
Construct an instance of the mapped class for the current row.
|
protected void |
initialize(Class<T> mappedClass)
Initialize the mapping meta-data for the given class.
|
static <T> DataClassRowMapper<T> |
newInstance(Class<T> mappedClass)
Static factory method to create a new
DataClassRowMapper . |
static <T> DataClassRowMapper<T> |
newInstance(Class<T> mappedClass,
ConversionService conversionService)
Static factory method to create a new
DataClassRowMapper . |
getColumnValue, getColumnValue, getConversionService, getMappedClass, initBeanWrapper, isCheckFullyPopulated, isPrimitivesDefaultedForNullValue, lowerCaseName, mapRow, setCheckFullyPopulated, setConversionService, setMappedClass, setPrimitivesDefaultedForNullValue, suppressProperty, underscoreName
public DataClassRowMapper()
DataClassRowMapper
for bean-style configuration.protected void initialize(Class<T> mappedClass)
BeanPropertyRowMapper
initialize
in class BeanPropertyRowMapper<T>
mappedClass
- the mapped classprotected T constructMappedInstance(ResultSet rs, TypeConverter tc) throws SQLException
BeanPropertyRowMapper
constructMappedInstance
in class BeanPropertyRowMapper<T>
rs
- the ResultSet to map (pre-initialized for the current row)tc
- a TypeConverter with this RowMapper's conversion serviceSQLException
- if an SQLException is encounteredpublic static <T> DataClassRowMapper<T> newInstance(Class<T> mappedClass)
DataClassRowMapper
.mappedClass
- the class that each row should be mapped tonewInstance(Class, ConversionService)
public static <T> DataClassRowMapper<T> newInstance(Class<T> mappedClass, @Nullable ConversionService conversionService)
DataClassRowMapper
.mappedClass
- the class that each row should be mapped toconversionService
- the ConversionService
for binding
JDBC values to bean properties, or null
for nonenewInstance(Class)
,
BeanPropertyRowMapper.setConversionService(org.springframework.core.convert.ConversionService)