/*
* Copyright 2009-2023 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.ibatis.executor.resultset;
import java.lang.reflect.Constructor;
import java.lang.reflect.Parameter;
import java.sql.CallableStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import org.apache.ibatis.annotations.AutomapConstructor;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.binding.MapperMethod.ParamMap;
import org.apache.ibatis.cache.CacheKey;
import org.apache.ibatis.cursor.Cursor;
import org.apache.ibatis.cursor.defaults.DefaultCursor;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.executor.ExecutorException;
import org.apache.ibatis.executor.loader.ResultLoader;
import org.apache.ibatis.executor.loader.ResultLoaderMap;
import org.apache.ibatis.executor.parameter.ParameterHandler;
import org.apache.ibatis.executor.result.DefaultResultContext;
import org.apache.ibatis.executor.result.DefaultResultHandler;
import org.apache.ibatis.executor.result.ResultMapException;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.Discriminator;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.mapping.ParameterMode;
import org.apache.ibatis.mapping.ResultMap;
import org.apache.ibatis.mapping.ResultMapping;
import org.apache.ibatis.reflection.MetaClass;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.ReflectorFactory;
import org.apache.ibatis.reflection.factory.ObjectFactory;
import org.apache.ibatis.session.AutoMappingBehavior;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultContext;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.TypeHandler;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.apache.ibatis.util.MapUtil;
/**
* @author Clinton Begin
* @author Eduardo Macarron
* @author Iwao AVE!
* @author Kazuki Shimizu
*/
public class DefaultResultSetHandler implements ResultSetHandler {
private static final Object DEFERRED = new Object();
private final Executor executor;
private final Configuration configuration;
private final MappedStatement mappedStatement;
private final RowBounds rowBounds;
private final ParameterHandler parameterHandler;
private final ResultHandler<?> resultHandler;
private final BoundSql boundSql;
private final TypeHandlerRegistry typeHandlerRegistry;
private final ObjectFactory objectFactory;
private final ReflectorFactory reflectorFactory;
// nested resultmaps
private final Map<CacheKey, Object> nestedResultObjects = new HashMap<>();
private final Map<String, Object> ancestorObjects = new HashMap<>();
private Object previousRowValue;
// multiple resultsets
private final Map<String, ResultMapping> nextResultMaps = new HashMap<>();
private final Map<CacheKey, List<PendingRelation>> pendingRelations = new HashMap<>();
// Cached Automappings
private final Map<String, List<UnMappedColumnAutoMapping>> autoMappingsCache = new HashMap<>();
private final Map<String, List<String>> constructorAutoMappingColumns = new HashMap<>();
// temporary marking flag that indicate using constructor mapping (use field to reduce memory usage)
private boolean useConstructorMappings;
private static class PendingRelation {
public MetaObject metaObject;
public ResultMapping propertyMapping;
}
private static class UnMappedColumnAutoMapping {
private final String column;
private final String property;
private final TypeHandler<?> typeHandler;
private final boolean primitive;
public UnMappedColumnAutoMapping(String column, String property, TypeHandler<?> typeHandler, boolean primitive) {
this.column = column;
this.property = property;
this.typeHandler = typeHandler;
this.primitive = primitive;
}
}
public DefaultResultSetHandler(Executor executor, MappedStatement mappedStatement, ParameterHandler parameterHandler,
ResultHandler<?> resultHandler, BoundSql boundSql, RowBounds rowBounds) {
this.executor = executor;
this.configuration = mappedStatement.getConfiguration();
this.mappedStatement = mappedStatement;
this.rowBounds = rowBounds;
this.parameterHandler = parameterHandler;
this.boundSql = boundSql;
this.typeHandlerRegistry = configuration.getTypeHandlerRegistry();
this.objectFactory = configuration.getObjectFactory();
this.reflectorFactory = configuration.getReflectorFactory();
this.resultHandler = resultHandler;
}
//
// HANDLE OUTPUT PARAMETER
//
@Override
public void handleOutputParameters(CallableStatement cs) throws SQLException {
final Object parameterObject = parameterHandler.getParameterObject();
final MetaObject metaParam = configuration.newMetaObject(parameterObject);
final List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
for (int i = 0; i < parameterMappings.size(); i++) {
final ParameterMapping parameterMapping = parameterMappings.get(i);
if (parameterMapping.getMode() == ParameterMode.OUT || parameterMapping.getMode() == ParameterMode.INOUT) {
if (ResultSet.class.equals(parameterMapping.getJavaType())) {
handleRefCursorOutputParameter((ResultSet) cs.getObject(i + 1), parameterMapping, metaParam);
} else {
final TypeHandler<?> typeHandler = parameterMapping.getTypeHandler();
metaParam.setValue(parameterMapping.getProperty(), typeHandler.getResult(cs, i + 1));
}
}
}
}
private void handleRefCursorOutputParameter(ResultSet rs, ParameterMapping parameterMapping, MetaObject metaParam)
throws SQLException {
if (rs == null) {
return;
}
try {
final String resultMapId = parameterMapping.getResultMapId();
final ResultMap resultMap = configuration.getResultMap(resultMapId);
final ResultSetWrapper rsw = new ResultSetWrapper(rs, configuration);
if (this.resultHandler == null) {
final DefaultResultHandler resultHandler = new DefaultResultHandler(objectFactory);
handleRowValues(rsw, resultMap, resultHandler, new RowBounds(), null);
metaParam.setValue(parameterMapping.getProperty(), resultHandler.getResultList());
} else {
handleRowValues(rsw, resultMap, resultHandler, new RowBounds(), null);
}
} finally {
// issue #228 (close resultsets)
closeResultSet(rs);
}
}
//
// HANDLE RESULT SETS
//
@Override
public List<Object> handleResultSets(Statement stmt) throws SQLException {
ErrorContext.instance().activity("handling results").object(mappedStatement.getId());
final List<Object> multipleResults = new ArrayList<>();
int resultSetCount = 0;
ResultSetWrapper rsw = getFirstResultSet(stmt);
List<ResultMap> resultMaps = mappedStatement.getResultMaps();
int resultMapCount = resultMaps
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MyBatis数据持久层框架 v3.5.13
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xml:436个
sql:156个
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2023-07-01
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MyBatis的前身就是iBatis。是一个数据持久层(ORM)框架。 MyBatis SQL映射器框架使将关系数据库与面向对象的应用程序结合使用变得更加容易。MyBatis使用XML描述符或注释将对象与存储过程或SQL语句耦合。相对于对象关系映射工具,简单性是MyBatis数据映射器的最大优势。 Mybaits的优点: 1、基于SQL语句编程,相当灵活,不会对应用程序或者数据库的现有设计造成任何影响,SQL写在XML里,解除sql与程序代码的耦合,便于统一管理;提供XML标签,支持编写动态SQL语句,并可重用。 2、与JDBC相比,减少了50%以上的代码量,消除了JDBC大量冗余的代码,不需要手动开关连接; 3、很好的与各种数据库兼容(因为MyBatis使用JDBC来连接数据库,所以只要JDBC支持的数据库MyBatis都支持)。 4、能够与Spring很好的集成; 5、提供映射标签,支持对象与数据库的ORM字段关系映射;提供对象关系映射标签,支持对象关系组件维护。 MyBatis框架的缺点: 1、SQL语句的编写工作量较大,尤其当字段多、关联表多时,对开发人员编写SQ
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