Hibernate的Update语句的多属性更新

李敏 — Fri, 22 Jan 2010 14:56:00 GMT

public class Test{
  /**
   * Test Method
   */
  private void service(){
    String param[] = {
      "name", "id"
    };
    Object values[] = {
      "minli", 1
    };

    update("Customer", param, values);
  }

  /**
   * 更新（该方法目前只针对一个查询参数，至于多参数的可以在此基础上更改，思路则不变）
   * @params 为要更新实体当中的属性，其中最后一个为查询参数
   */
  private void update(String entity, String[] params, Object[] values){
    if (params == null || values == null)
      throw new NullPointerException("param is null!");

    if (params.length < 2 || values.length < 2)
      throw new IllegalArgumentException("param is wrong");

    if (params.length != values.length)
      throw new IllegalArgumentException("param is wrong");

    String updateHQL = updateSQL(entity, params, values);

    //这个地方可以使用query来进行遍历数组来赋值
    System.out.println(updateHQL);
  }

  /**
   * 生成Update HQL语句
   */
  private String updateSQL(String entity, String[] params, Object[] values){
    String entityName = entity.toLowerCase();

    String baseHQL = "update " + entity + " " + entityName + " set ";

    for (int i = 0; i < params.length - 1; i++){
      String param = params[i];

      baseHQL += entityName + "." + param + "=:" + param;

      if (i < params.length - 2)
        baseHQL += ",";
    }
    String param = params[params.length - 1];

    baseHQL += " where " + entityName + "." + param + "=:" + param;

    return baseHQL;
  }

  public static void main(String[] args){
    new Test().service();
  }
}

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Hibernate的Update语句的多属性更新