org.aoju.bus.mapper.provider.IdsProvider Maven / Gradle / Ivy

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package org.aoju.bus.mapper.provider;

import org.aoju.bus.core.exception.InternalException;
import org.aoju.bus.mapper.builder.EntityBuilder;
import org.aoju.bus.mapper.builder.MapperBuilder;
import org.aoju.bus.mapper.builder.MapperTemplate;
import org.aoju.bus.mapper.builder.SqlBuilder;
import org.aoju.bus.mapper.entity.EntityColumn;
import org.apache.ibatis.mapping.MappedStatement;

import java.util.Set;

/**
 * 通过 ids 字符串的各种操作
 * ids 如 "1,2,3"
 *
 * @author Kimi Liu
 * @since Java 17+
 */
public class IdsProvider extends MapperTemplate {

    public IdsProvider(Class mapperClass, MapperBuilder mapperBuilder) {
        super(mapperClass, mapperBuilder);
    }

    /**
     * 根据主键字符串进行删除，类中只有存在一个带有@Id注解的字段
     *
     * @param ms MappedStatement
     * @return the string
     */
    public String deleteByIds(MappedStatement ms) {
        final Class entityClass = getEntityClass(ms);
        StringBuilder sql = new StringBuilder();
        sql.append(SqlBuilder.deleteFromTable(entityClass, tableName(entityClass)));
        Set columnList = EntityBuilder.getPKColumns(entityClass);
        if (columnList.size() == 1) {
            EntityColumn column = columnList.iterator().next();
            sql.append(" where ");
            sql.append(column.getColumn());
            sql.append(" in (${_parameter})");
        } else {
            throw new InternalException("继承 deleteByIds 方法的实体类[" + entityClass.getName() + "]中必须只有一个带有 @Id 注解的字段");
        }
        return sql.toString();
    }

    /**
     * 根据主键字符串进行查询，类中只有存在一个带有@Id注解的字段
     *
     * @param ms MappedStatement
     * @return the string
     */
    public String selectByIds(MappedStatement ms) {
        final Class entityClass = getEntityClass(ms);
        // 将返回值修改为实体类型
        setResultType(ms, entityClass);
        StringBuilder sql = new StringBuilder();
        sql.append(SqlBuilder.selectAllColumns(entityClass));
        sql.append(SqlBuilder.fromTable(entityClass, tableName(entityClass)));
        Set columnList = EntityBuilder.getPKColumns(entityClass);
        if (columnList.size() == 1) {
            EntityColumn column = columnList.iterator().next();
            sql.append(" where ");
            sql.append(column.getColumn());
            sql.append(" in (${_parameter})");
        } else {
            throw new InternalException("继承 selectByIds 方法的实体类[" + entityClass.getName() + "]中必须只有一个带有 @Id 注解的字段");
        }
        return sql.toString();
    }

}