mybatis 源码mapper注入和sql执行流程图

processBeanDefinitions方法private void processBeanDefinitions(Set<BeanDefinitionHolder> beanDefinitions) {        Iterator var3 = beanDefinitions.iterator();        while(var3.hasNext()) {            BeanDefinitionHolder holder = (BeanDefinitionHolder)var3.next();            GenericBeanDefinition definition = (GenericBeanDefinition)holder.getBeanDefinition();            if (this.logger.isDebugEnabled()) {                this.logger.debug(\"Creating MapperFactoryBean with name '\" + holder.getBeanName() + \"' and '\" + definition.getBeanClassName() + \"' mapperInterface\");            }            definition.getConstructorArgumentValues().addGenericArgumentValue(definition.getBeanClassName());            definition.setBeanClass(this.mapperFactoryBean.getClass());}

StatementHandler

setParameters()

Configuration

@Import({MapperScannerRegistrar.class})

SqlSessionFactory

public void parameterize(Statement statement) throws SQLException { this.parameterHandler.setParameters((PreparedStatement)statement); }

doQuery

handleResultSets（）

getMapper()

invoke()

MapperRegistry

BaseExecutor

sqlSession

registerBeanDefinitionregisterBeanDefinitions()

Executor

预编译sql

ParameterHandler

newInstance()

为什么要将接口的Bean设置为MapperFactoryBean呢，就是因为当IOC容器中Bean实现了FactoryBean后，通过getBean获取到的Bean对象并不是FactoryBean的实现类对象，而是实现类getObject方法返回的对象。MapperFactoryBean类的getObject方法如下：

实现

execute()

public void setParameters(PreparedStatement ps) {        ErrorContext.instance().activity(\"setting parameters\").object(this.mappedStatement.getParameterMap().getId());        List<ParameterMapping> parameterMappings = this.boundSql.getParameterMappings();        if (parameterMappings != null) {            for(int i = 0; i < parameterMappings.size(); ++i) {                ParameterMapping parameterMapping = (ParameterMapping)parameterMappings.get(i);                if (parameterMapping.getMode() != ParameterMode.OUT) {                    String propertyName = parameterMapping.getProperty();                    Object value;                    if (this.boundSql.hasAdditionalParameter(propertyName)) {                        value = this.boundSql.getAdditionalParameter(propertyName);                    } else if (this.parameterObject == null) {                        value = null;                    } else if (this.typeHandlerRegistry.hasTypeHandler(this.parameterObject.getClass())) {                        value = this.parameterObject;                    } else {                        MetaObject metaObject = this.configuration.newMetaObject(this.parameterObject);                        value = metaObject.getValue(propertyName);                    }                    font color=\"#ff3333\

getMapper（）

public Statement font color=\"#ff3333\

public class MapperProxy<T> implements font color=\"#ff3333\

MapperProxy

封装参数

getObject()

public Objectfont color=\"#ff3333\

SimpleExecutor

public List<Object> handleResultSets(Statement stmt) throws SQLException {        ErrorContext.instance().activity(\"handling results\

MapperScan

ResultHandler

query()

processBeanDefinitions()

DefaultResultSetHandler

DefaultParameterHandler 

参数封装

doQuer()

MapperFactoryBean

public void parameterize(Statement statement) throws SQLException {        this.parameterHandler.setParameters((PreparedStatement)statement);    }

basePackage=com.dv.xx

SqlSessionFactoryBuilder

执行里面的doScan()方法

prepareStatement()

configuration.getMapper

public class MapperFactoryBean<T> extends SqlSessionDaoSupport implements FactoryBean<T> {public T getObject() throws Exception {        return this.getSqlSession().getMapper(this.mapperInterface);    }}

BaseStatementHandler

    public Set<BeanDefinitionHolder> doScan(String... basePackages) {        Set<BeanDefinitionHolder> beanDefinitions = super.doScan(basePackages);        if (beanDefinitions.isEmpty()) {            this.logger.warn(\"No MyBatis mapper was found in '\" + Arrays.toString(basePackages) + \"' package. Please check your configuration.\");        } else {            this.processBeanDefinitions(beanDefinitions);        }        return beanDefinitions;    }

doScan()

DefaultSqlSession

结果映射

接口：sqlsession

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selectList()

ClassPathMapperScanner

MapperMethod

PreparedStatementHandler

MapperScannerRegistrar

ResultSetHandler