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Mybatis 通用 Mapper 基础方法实现
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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2017 [email protected]
 *
 * 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.
 */

package tk.mybatis.mapper.provider.base;

import org.apache.ibatis.mapping.MappedStatement;
import tk.mybatis.mapper.MapperException;
import tk.mybatis.mapper.entity.EntityColumn;
import tk.mybatis.mapper.mapperhelper.*;

import java.util.Set;

/**
 * BaseInsertProvider实现类，基础方法实现类
 *
 * @author liuzh
 */
public class BaseInsertProvider extends MapperTemplate {

    public BaseInsertProvider(Class mapperClass, MapperHelper mapperHelper) {
        super(mapperClass, mapperHelper);
    }

    public String insert(MappedStatement ms) {
        Class entityClass = getEntityClass(ms);
        StringBuilder sql = new StringBuilder();
        //获取全部列
        Set columnList = EntityHelper.getColumns(entityClass);
        EntityColumn logicDeleteColumn = SqlHelper.getLogicDeleteColumn(entityClass);
        processKey(sql, entityClass, ms, columnList);
        sql.append(SqlHelper.insertIntoTable(entityClass, tableName(entityClass)));
        sql.append(SqlHelper.insertColumns(entityClass, false, false, false));
        sql.append("");
        for (EntityColumn column : columnList) {
            if (!column.isInsertable()) {
                continue;
            }
            if (logicDeleteColumn != null && logicDeleteColumn == column) {
                sql.append(SqlHelper.getLogicDeletedValue(column, false)).append(",");
                continue;
            }
            //优先使用传入的属性值,当原属性property!=null时，用原属性
            //自增的情况下,如果默认有值,就会备份到property_cache中,所以这里需要先判断备份的值是否存在
            if (column.isIdentity()) {
                sql.append(SqlHelper.getIfCacheNotNull(column, column.getColumnHolder(null, "_cache", ",")));
            } else {
                //其他情况值仍然存在原property中
                sql.append(SqlHelper.getIfNotNull(column, column.getColumnHolder(null, null, ","), isNotEmpty()));
            }
            //当属性为null时，如果存在主键策略，会自动获取值，如果不存在，则使用null
            if (column.isIdentity()) {
                sql.append(SqlHelper.getIfCacheIsNull(column, column.getColumnHolder() + ","));
            } else {
                //当null的时候，如果不指定jdbcType，oracle可能会报异常，指定VARCHAR不影响其他
                sql.append(SqlHelper.getIfIsNull(column, column.getColumnHolder(null, null, ","), isNotEmpty()));
            }
        }
        sql.append("");
        return sql.toString();
    }

    public String insertSelective(MappedStatement ms) {
        Class entityClass = getEntityClass(ms);
        StringBuilder sql = new StringBuilder();
        //获取全部列
        Set columnList = EntityHelper.getColumns(entityClass);
        EntityColumn logicDeleteColumn = SqlHelper.getLogicDeleteColumn(entityClass);
        processKey(sql, entityClass, ms, columnList);
        sql.append(SqlHelper.insertIntoTable(entityClass, tableName(entityClass)));
        sql.append("");
        for (EntityColumn column : columnList) {
            if (!column.isInsertable()) {
                continue;
            }
            if (column.isIdentity()) {
                sql.append(column.getColumn()).append(",");
            } else {
                if (logicDeleteColumn != null && logicDeleteColumn == column) {
                    sql.append(column.getColumn()).append(",");
                    continue;
                }
                sql.append(SqlHelper.getIfNotNull(column, column.getColumn() + ",", isNotEmpty()));
            }
        }
        sql.append("");

        sql.append("");
        for (EntityColumn column : columnList) {
            if (!column.isInsertable()) {
                continue;
            }
            if (logicDeleteColumn != null && logicDeleteColumn == column) {
                sql.append(SqlHelper.getLogicDeletedValue(column, false)).append(",");
                continue;
            }
            //优先使用传入的属性值,当原属性property!=null时，用原属性
            //自增的情况下,如果默认有值,就会备份到property_cache中,所以这里需要先判断备份的值是否存在
            if (column.isIdentity()) {
                sql.append(SqlHelper.getIfCacheNotNull(column, column.getColumnHolder(null, "_cache", ",")));
            } else {
                //其他情况值仍然存在原property中
                sql.append(SqlHelper.getIfNotNull(column, column.getColumnHolder(null, null, ","), isNotEmpty()));
            }
            //当属性为null时，如果存在主键策略，会自动获取值，如果不存在，则使用null
            //序列的情况
            if (column.isIdentity()) {
                sql.append(SqlHelper.getIfCacheIsNull(column, column.getColumnHolder() + ","));
            }
        }
        sql.append("");
        return sql.toString();
    }

    private void processKey(StringBuilder sql, Class entityClass, MappedStatement ms, Set columnList) {
        //Identity列只能有一个
        Boolean hasIdentityKey = false;
        //先处理cache或bind节点
        for (EntityColumn column : columnList) {
            if (column.isIdentity()) {
                //这种情况下,如果原先的字段有值,需要先缓存起来,否则就一定会使用自动增长
                //这是一个bind节点
                sql.append(SqlHelper.getBindCache(column));
                //如果是Identity列，就需要插入selectKey
                //如果已经存在Identity列，抛出异常
                if (hasIdentityKey) {
                    //jdbc类型只需要添加一次
                    if (column.getGenerator() != null && "JDBC".equals(column.getGenerator())) {
                        continue;
                    }
                    throw new MapperException(ms.getId() + "对应的实体类" + entityClass.getName() + "中包含多个MySql的自动增长列,最多只能有一个!");
                }
                //插入selectKey
                SelectKeyHelper.newSelectKeyMappedStatement(ms, column, entityClass, isBEFORE(), getIDENTITY(column));
                hasIdentityKey = true;
            } else if (column.getGenIdClass() != null) {
                sql.append("");
            }

        }
    }
}