cn.featherfly.hammer.sqldb.jdbc

类 SingleColumnRowMapper<T>

java.lang.Object

cn.featherfly.hammer.sqldb.jdbc.SingleColumnRowMapper<T>

类型参数:

T - the generic type

所有已实现的接口:

cn.featherfly.common.repository.mapping.RowMapper<T>

public class SingleColumnRowMapper<T>
extends java.lang.Object
implements org.springframework.jdbc.core.RowMapper<T>, cn.featherfly.common.repository.mapping.RowMapper<T>

The Class SingleColumnRowMapper.

构造器概要

构造器

构造器和说明
SingleColumnRowMapper(java.lang.Class<T> requiredType, cn.featherfly.common.db.mapping.SqlTypeMappingManager manager) Create a new SingleColumnRowMapper.

方法概要

限定符和类型	方法和说明
protected java.lang.Object	convertValueToRequiredType(java.lang.Object value, java.lang.Class<?> requiredType) Convert the given column value to the specified required type.
protected java.lang.Object	getColumnValue(java.sql.ResultSet rs, int index) Retrieve a JDBC object value for the specified column, using the most appropriate value type.
protected java.lang.Object	getColumnValue(java.sql.ResultSet rs, int index, java.lang.Class<?> requiredType) Retrieve a JDBC object value for the specified column.
T	mapRow(cn.featherfly.common.repository.mapping.ResultSet res, int rowNum)
T	mapRow(java.sql.ResultSet rs, int rowNum) Extract a value for the single column in the current row.
void	setConversionService(org.springframework.core.convert.ConversionService conversionService) Set a ConversionService for converting a fetched value.
void	setRequiredType(java.lang.Class<T> requiredType) Set the type that each result object is expected to match.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

SingleColumnRowMapper

public SingleColumnRowMapper(java.lang.Class<T> requiredType,
                             cn.featherfly.common.db.mapping.SqlTypeMappingManager manager)

Create a new SingleColumnRowMapper.

参数:

requiredType - the type that each result object is expected to match

manager - the manager

方法详细资料

setRequiredType

public void setRequiredType(java.lang.Class<T> requiredType)

Set the type that each result object is expected to match.

If not specified, the column value will be exposed as returned by the JDBC driver.

参数:

requiredType - the new required type

setConversionService

public void setConversionService(@Nullable
                                 org.springframework.core.convert.ConversionService conversionService)

Set a ConversionService for converting a fetched value.

Default is the DefaultConversionService.

参数:

conversionService - the new conversion service

从以下版本开始:

5.0.4

另请参阅:

DefaultConversionService.getSharedInstance()

mapRow

public T mapRow(cn.featherfly.common.repository.mapping.ResultSet res,
                int rowNum)

指定者:

mapRow 在接口中 cn.featherfly.common.repository.mapping.RowMapper<T>

mapRow

@Nullable
public T mapRow(java.sql.ResultSet rs,
                           int rowNum)
                    throws java.sql.SQLException

Extract a value for the single column in the current row.

Validates that there is only one column selected, then delegates to getColumnValue() and also convertValueToRequiredType, if necessary.

参数:

rs - the rs

rowNum - the row num

返回:

the t

抛出:

java.sql.SQLException - the SQL exception

另请参阅:

ResultSetMetaData.getColumnCount(), getColumnValue(java.sql.ResultSet, int, Class), convertValueToRequiredType(Object, Class)

getColumnValue

@Nullable
protected java.lang.Object getColumnValue(java.sql.ResultSet rs,
                                                     int index,
                                                     @Nullable
                                                     java.lang.Class<?> requiredType)
                                              throws java.sql.SQLException

Retrieve a JDBC object value for the specified column.

The default implementation calls JdbcUtils.getResultSetValue(java.sql.ResultSet, int, Class). If no required type has been specified, this method delegates to getColumnValue(rs, index), which basically calls ResultSet.getObject(index) but applies some additional default conversion to appropriate value types.

参数:

rs - is the ResultSet holding the data

index - is the column index

requiredType - the type that each result object is expected to match (or null if none specified)

返回:

the Object value

抛出:

java.sql.SQLException - in case of extraction failure

另请参阅:

JdbcUtils.getResultSetValue(java.sql.ResultSet, int, Class), getColumnValue(java.sql.ResultSet, int)

getColumnValue

@Nullable
protected java.lang.Object getColumnValue(java.sql.ResultSet rs,
                                                     int index)
                                              throws java.sql.SQLException

Retrieve a JDBC object value for the specified column, using the most appropriate value type. Called if no required type has been specified.

The default implementation delegates to JdbcUtils.getResultSetValue(), which uses the ResultSet.getObject(index) method. Additionally, it includes a "hack" to get around Oracle returning a non-standard object for their TIMESTAMP datatype. See the JdbcUtils#getResultSetValue() javadoc for details.

参数:

rs - is the ResultSet holding the data

index - is the column index

返回:

the Object value

抛出:

java.sql.SQLException - in case of extraction failure

另请参阅:

JdbcUtils.getResultSetValue(java.sql.ResultSet, int)

convertValueToRequiredType

@Nullable
protected java.lang.Object convertValueToRequiredType(java.lang.Object value,
                                                                 java.lang.Class<?> requiredType)

Convert the given column value to the specified required type. Only called if the extracted column value does not match already.

If the required type is String, the value will simply get stringified via toString(). In case of a Number, the value will be converted into a Number, either through number conversion or through String parsing (depending on the value type). Otherwise, the value will be converted to a required type using the ConversionService.

参数:

value - the column value as extracted from getColumnValue() (never null)

requiredType - the type that each result object is expected to match (never null)

返回:

the converted value

另请参阅:

getColumnValue(java.sql.ResultSet, int, Class)