Mybatis-plus自定义BaseMapper

MysqlInsertAllBatch

import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.metadata.TableInfo;
import org.apache.ibatis.executor.keygen.NoKeyGenerator;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlSource;
/**
 *  自定义mysql的批量保存语法：
 *  如：insert into user(id, name, age) values (1, "a", 17), (2,"b", 18)
 *  自定义mapper如下使用：int mysqlInsertAllBatch(@Param("list") List<T> batchList);
 * @author mori
 * @date 2021-07-28 10:52:00
 */
public class MysqlInsertAllBatch extends AbstractMethod {
    @Override
    public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
        final String sql = "<script>insert into %s %s values %s</script>";
        final String fieldSql = prepareFieldSql(tableInfo);
        final String valueSql = prepareValuesSqlForMysqlBatch(tableInfo);
        final String sqlResult = String.format(sql, tableInfo.getTableName(), fieldSql, valueSql);
        SqlSource sqlSource = languageDriver.createSqlSource(configuration, sqlResult, modelClass);
        return this.addInsertMappedStatement(mapperClass, modelClass, "mysqlInsertAllBatch", sqlSource, new NoKeyGenerator(), null, null);
    }
    private String prepareFieldSql(TableInfo tableInfo) {
        StringBuilder fieldSql = new StringBuilder();
        fieldSql.append(tableInfo.getKeyColumn()).append(",");
        tableInfo.getFieldList().forEach(x -> {
            fieldSql.append(x.getColumn()).append(",");
        });
        fieldSql.delete(fieldSql.length() - 1, fieldSql.length());
        fieldSql.insert(0, "(");
        fieldSql.append(")");
        return fieldSql.toString();
    }
    private String prepareValuesSqlForMysqlBatch(TableInfo tableInfo) {
        final StringBuilder valueSql = new StringBuilder();
        valueSql.append("<foreach collection=\"list\" item=\"item\" index=\"index\" open=\"(\" separator=\"),(\" close=\")\">");
        valueSql.append("#{item.").append(tableInfo.getKeyProperty()).append("},");
        tableInfo.getFieldList().forEach(x -> valueSql.append("#{item.").append(x.getProperty()).append("},"));
        valueSql.delete(valueSql.length() - 1, valueSql.length());
        valueSql.append("</foreach>");
        return valueSql.toString();
    }
}

DeleteAll

import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.metadata.TableInfo;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlSource;
/**
 * 物理删除表中所有数据
 * 自定义mapper如下使用：
 * Integer deleteAll();
 * @author mori
 * @date 2021-07-28 11:06:00
 */
public class DeleteAll extends AbstractMethod {
    @Override
    public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
        /* 执行 SQL ，动态 SQL 参考类 SqlMethod */
        String sql = "delete from " + tableInfo.getTableName();
        /* mapper 接口方法名一致 */
        String method = "deleteAll";
        SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, modelClass);
        return this.addDeleteMappedStatement(mapperClass, method, sqlSource);
    }
}

MyLogicSqlInjector

import java.util.List;
/**
 * sql注入器
 * @author mori
 * @date 2021-07-28 10:54:00
 */
public class MyLogicSqlInjector extends DefaultSqlInjector {
    /**
     * 查询方法列表
     * 如果只需增加方法，保留MP自带方法
     * 可以super.getMethodList() 再add
     *
     * @return {@link List<AbstractMethod>}
     */
    @Override
    public List<AbstractMethod> getMethodList(Class<?> mapperClass) {
        List<AbstractMethod> methodList = super.getMethodList(mapperClass);
        methodList.add(new MysqlInsertAllBatch());
        methodList.add(new DeleteAll());
        methodList.add(new LogicDeleteByIdWithFill());
        return methodList;
    }
}

CustomBaseMapper

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Param;
import java.util.List;
/**
 * 自定义扩展mybatis-plus的BaseMapper
 * @author mori
 * @date 2021-07-28 10:57:00
 */
public interface CustomBaseMapper<T> extends BaseMapper<T> {
    /**
     * mysql批量插入
     * 如果要自动填充，@{@code Param}(xx) xx参数名必须是 list/collection/array 3个的其中之一
     * @param batchList 批处理列表
     * @return int
     */
    int mysqlInsertAllBatch(@Param("list") List<T> batchList);
    /**
     * 带自动填充功能的逻辑删除
     *
     * @param entity 实体
     * @return int
     */
    int deleteByIdWithFill(T entity);
    /**
     * 物理删除表中所有数据
     *
     * @return {@link Integer}
     */
    Integer deleteAll();
}