db.sql.api.cmd.basic.IOrderByDirection Maven / Gradle / Ivy
package db.sql.api.cmd.basic;
import db.sql.api.Cmd;
import db.sql.api.DbType;
import db.sql.api.SqlBuilderContext;
/**
* order by 方向
*/
public interface IOrderByDirection {
/**
* 判断是否支持
*
* @param dbType
* @return
*/
static boolean isSupportNullsOrder(DbType dbType) {
if (dbType == DbType.MYSQL || dbType == DbType.MARIA_DB || dbType == DbType.SQL_SERVER) {
return false;
}
return true;
}
/**
* 构建sql
*
* @param module 模块的组件 例如 select ，order by
* @param parent 使用改组件的组件
* @param context sql构建上下文
* @param sqlBuilder 构建SQL的StringBuilder
* @return SQL
*/
StringBuilder sql(Cmd module, Cmd parent, SqlBuilderContext context, StringBuilder sqlBuilder);
}