Java tutorial
package com.xiaogua.web.util; /* * The MIT License (MIT) * * Copyright (c) 2014-2016 abel533@gmail.com * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ import java.lang.reflect.Method; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.ibatis.annotations.Param; import org.apache.ibatis.mapping.BoundSql; import org.apache.ibatis.mapping.MappedStatement; import org.apache.ibatis.mapping.ParameterMapping; import org.apache.ibatis.mapping.ParameterMode; import org.apache.ibatis.reflection.MetaObject; import org.apache.ibatis.reflection.SystemMetaObject; import org.apache.ibatis.session.Configuration; import org.apache.ibatis.session.ResultHandler; import org.apache.ibatis.session.RowBounds; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.type.JdbcType; import org.apache.ibatis.type.TypeHandlerRegistry; /** * Mybatis - ?Mybatissql * * @author liuzh/abel533/isea533 */ public class MybatisSqlHelper { /** * ??sql * * @param mapper * @param methodName * @param args * @return */ public static String getMapperSql(Object mapper, String methodName, Object... args) { MetaObject metaObject = SystemMetaObject.forObject(mapper); SqlSession session = (SqlSession) metaObject.getValue("h.sqlSession"); Class<?> mapperInterface = (Class<?>) metaObject.getValue("h.mapperInterface"); String fullMethodName = mapperInterface.getCanonicalName() + "." + methodName; if (args == null || args.length == 0) { return getNameSpaceSql(session, fullMethodName, null); } else { return getMapperSql(session, mapperInterface, methodName, args); } } /** * Mapper???sql * * @param session * @param fullMapperMethodName * @param args * @return */ public static String getMapperSql(SqlSession session, String fullMapperMethodName, Object... args) { if (args == null || args.length == 0) { return getNameSpaceSql(session, fullMapperMethodName, null); } String methodName = fullMapperMethodName.substring(fullMapperMethodName.lastIndexOf('.') + 1); Class<?> mapperInterface = null; try { mapperInterface = Class .forName(fullMapperMethodName.substring(0, fullMapperMethodName.lastIndexOf('.'))); return getMapperSql(session, mapperInterface, methodName, args); } catch (ClassNotFoundException e) { throw new IllegalArgumentException("?" + fullMapperMethodName + "?"); } } /** * Mapper??? * * @param session * @param mapperInterface * @param methodName * @param args * @return */ @SuppressWarnings("unchecked") public static String getMapperSql(SqlSession session, Class<?> mapperInterface, String methodName, Object... args) { String fullMapperMethodName = mapperInterface.getCanonicalName() + "." + methodName; if (args == null || args.length == 0) { return getNameSpaceSql(session, fullMapperMethodName, null); } Method method = getDeclaredMethods(mapperInterface, methodName); Map<Object, Object> params = new HashMap<Object, Object>(); final Class<?>[] argTypes = method.getParameterTypes(); for (int i = 0; i < argTypes.length; i++) { if (!RowBounds.class.isAssignableFrom(argTypes[i]) && !ResultHandler.class.isAssignableFrom(argTypes[i])) { String paramName = "param" + String.valueOf(params.size() + 1); paramName = getParamNameFromAnnotation(method, i, paramName); params.put(paramName, i >= args.length ? null : args[i]); } } if (args != null && args.length == 1) { Object _params = wrapCollection(args[0]); if (_params instanceof Map) { params.putAll((Map<Object, Object>) _params); } } return getNameSpaceSql(session, fullMapperMethodName, params); } /** * ????sql * * @param session * @param namespace * @return */ public static String getNameSpaceSql(SqlSession session, String namespace) { return getNameSpaceSql(session, namespace, null); } /** * ????sql * * @param session * @param namespace * @param params * @return */ public static String getNameSpaceSql(SqlSession session, String namespace, Object params) { params = wrapCollection(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; } /** * ??? * ????? * * @param sql * @param value * @param jdbcType * @param javaType * @return */ private static String replaceParameter(String sql, Object value, JdbcType jdbcType, Class<?> javaType) { String strValue = String.valueOf(value); if (jdbcType != null) { switch (jdbcType) { // case BIT: case TINYINT: case SMALLINT: case INTEGER: case BIGINT: case FLOAT: case REAL: case DOUBLE: case NUMERIC: case DECIMAL: break; // case DATE: case TIME: case TIMESTAMP: //? default: strValue = "'" + strValue + "'"; } } else if (Number.class.isAssignableFrom(javaType)) { //??? } else { strValue = "'" + strValue + "'"; } return sql.replaceFirst("\\?", strValue); } /** * ? * * @param clazz * @param methodName * @return */ private static Method getDeclaredMethods(Class<?> clazz, String methodName) { Method[] methods = clazz.getDeclaredMethods(); for (Method method : methods) { if (method.getName().equals(methodName)) { return method; } } throw new IllegalArgumentException("" + methodName + "??"); } /** * ???? * * @param method * @param i * @param paramName * @return */ private static String getParamNameFromAnnotation(Method method, int i, String paramName) { final Object[] paramAnnos = method.getParameterAnnotations()[i]; for (Object paramAnno : paramAnnos) { if (paramAnno instanceof Param) { paramName = ((Param) paramAnno).value(); } } return paramName; } /** * ?? * * @param object * @return */ private static Object wrapCollection(final Object object) { if (object instanceof List) { Map<String, Object> map = new HashMap<String, Object>(); map.put("list", object); return map; } else if (object != null && object.getClass().isArray()) { Map<String, Object> map = new HashMap<String, Object>(); map.put("array", object); return map; } return object; } }