MyBatis之SqlSourceBuilder

執行流程

• MapperRegistry#addMapper
• MapperRegistry#getMapper
• MapperProxyFactory#newInstance
• MapperProxy#invoke
• MapperMethod#execute
• DefaultSqlSession#selectOne
• DefaultSqlSession#selectList
• BaseExecutor#query
• MappedStatement#getBoundSql
• DynamicSqlSource#getBoundSql
• SqlSourceBuilder#parse

作用

1、将"#{xxx}“替換為占位符”?"

2、将占位符"?"對應的屬性資訊放到SqlSourceBuilder.ParameterMappingTokenHandler的parameterMappings集合中

3、建構StaticSqlSource，StaticSqlSource含有sql，parameterMappings，configuration

核心方法

public SqlSource parse(String originalSql, Class<?> parameterType, Map<String, Object> additionalParameters) {
    ParameterMappingTokenHandler handler = new ParameterMappingTokenHandler(configuration, parameterType, additionalParameters);
    GenericTokenParser parser = new GenericTokenParser("#{", "}", handler);
    String sql = parser.parse(originalSql);
    return new StaticSqlSource(configuration, sql, handler.getParameterMappings());
  }