Java Configuration.newMetaObject方法代码示例

import org.apache.ibatis.session.Configuration; //导入方法依赖的package包/类
@SuppressWarnings("unchecked")
private static Object coalesceResults(Configuration configuration, List<Object> valueObjects, String collectionProperty)
{
    // Take the first result as the base value
    Object resultObject = null;
    MetaObject probe = null;
    Collection<Object> collection = null;
    for (Object object : valueObjects)
    {
        if (collection == null)
        {
            resultObject = object;
            probe = configuration.newMetaObject(resultObject);
            collection = (Collection<Object>) probe.getValue(collectionProperty);
        }
        else
        {
            Collection<?> addedValues = (Collection<Object>) probe.getValue(collectionProperty);
            collection.addAll(addedValues);
        }
    }
    // Done
    return resultObject;
}
 

import org.apache.ibatis.session.Configuration; //导入方法依赖的package包/类
/**
 * 通过命名空间方式获取sql
 * @param session
 * @param namespace
 * @param params
 * @return
 */
public static String getNamespaceSql(SqlSession session, String namespace, Object params) {
    Configuration configuration = session.getConfiguration();
    MappedStatement mappedStatement = configuration.getMappedStatement(namespace);
    TypeHandlerRegistry typeHandlerRegistry = mappedStatement.getConfiguration().getTypeHandlerRegistry();
    BoundSql boundSql = mappedStatement.getBoundSql(params);
    List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
    String sql = boundSql.getSql();
    if (parameterMappings != null) {
        for (int i = 0; i < parameterMappings.size(); i++) {
            ParameterMapping parameterMapping = parameterMappings.get(i);
            if (parameterMapping.getMode() != ParameterMode.OUT) {
                Object value;
                String propertyName = parameterMapping.getProperty();
                if (boundSql.hasAdditionalParameter(propertyName)) {
                    value = boundSql.getAdditionalParameter(propertyName);
                } else if (params == null) {
                    value = null;
                } else if (typeHandlerRegistry.hasTypeHandler(params.getClass())) {
                    value = params;
                } else {
                    MetaObject metaObject = configuration.newMetaObject(params);
                    value = metaObject.getValue(propertyName);
                }
                JdbcType jdbcType = parameterMapping.getJdbcType();
                if (value == null && jdbcType == null) jdbcType = configuration.getJdbcTypeForNull();
                sql = replaceParameter(sql, value, jdbcType, parameterMapping.getJavaType());
            }
        }
    }
    return sql;
}
 

import org.apache.ibatis.session.Configuration; //导入方法依赖的package包/类
/**
 * 对SQL参数(?)设值,参考org.apache.ibatis.executor.parameter.
 * DefaultParameterHandler
 * 
 * @param ps
 *            表示预编译的 SQL 语句的对象。
 * @param mappedStatement
 *            MappedStatement
 * @param boundSql
 *            SQL
 * @param parameterObject
 *            参数对象
 * @throws java.sql.SQLException
 *             数据库异常
 */
public static void setParameters(PreparedStatement ps,
		MappedStatement mappedStatement, BoundSql boundSql,
		Object parameterObject) throws SQLException {
	ErrorContext.instance().activity("setting parameters")
			.object(mappedStatement.getParameterMap().getId());
	List<ParameterMapping> parameterMappings = boundSql
			.getParameterMappings();
	if (null != parameterMappings) {
		Configuration configuration = mappedStatement.getConfiguration();
		TypeHandlerRegistry typeHandlerRegistry = configuration
				.getTypeHandlerRegistry();
		MetaObject metaObject = parameterObject == null ? null
				: configuration.newMetaObject(parameterObject);
		for (int i = 0; i < parameterMappings.size(); i++) {
			ParameterMapping parameterMapping = parameterMappings.get(i);
			if (parameterMapping.getMode() != ParameterMode.OUT) {
				Object value;
				String propertyName = parameterMapping.getProperty();
				PropertyTokenizer prop = new PropertyTokenizer(propertyName);
				if (null == parameterObject) {
					value = null;
				} else if (typeHandlerRegistry
						.hasTypeHandler(parameterObject.getClass())) {
					value = parameterObject;
				} else if (boundSql.hasAdditionalParameter(propertyName)) {
					value = boundSql.getAdditionalParameter(propertyName);
				} else if (propertyName
						.startsWith(ForEachSqlNode.ITEM_PREFIX)
						&& boundSql.hasAdditionalParameter(prop.getName())) {
					value = boundSql.getAdditionalParameter(prop.getName());
					if (null != value) {
						value = configuration.newMetaObject(value)
								.getValue(
										propertyName.substring(prop
												.getName().length()));
					}
				} else {
					value = metaObject == null ? null : metaObject
							.getValue(propertyName);
				}
				TypeHandler typeHandler = parameterMapping.getTypeHandler();
				if (null == typeHandler) {
					throw new ExecutorException(
							"There was no TypeHandler found for parameter "
									+ propertyName + " of statement "
									+ mappedStatement.getId());
				}
				typeHandler.setParameter(ps, i + 1, value,
						parameterMapping.getJdbcType());
			}
		}
	}
}