コード例 #1
0
  /** 一对多级联更新 */
  public void update(long newIdVal) {
    if (newIdVal <= 0 || this.fields == null || this.fields.size() == 0) return;
    if (this.idVal == null || "0".equals(this.idVal) || "".equals(this.idVal)) {
      return;
    } else if (DAOFactory.getSelectDAO(dsName).selectOne(t, this.idField) == null) {
      // 检查一下当前对象的ID是否存在于数据库
      return;
    }
    // "update {table} set {idCol} = {newIdVal} where {idCol} = {idVal}
    // ; update {relTable} set {fromCol} = {newIdVal} where {fromCol} = {idVal}"
    String format = "update %s set %s = %s where %s = %s ;";
    for (Field f : fields) {
      Method tarGetter = ru.getGetter(f.getName());
      if (tarGetter == null) continue;

      ManyToMany ann = tarGetter.getAnnotation(ManyToMany.class);
      if (ann == null) {
        ann = f.getAnnotation(ManyToMany.class);
        if (ann == null) continue;
      }

      JoinTable join = tarGetter.getAnnotation(JoinTable.class);
      if (join == null) {
        join = f.getAnnotation(JoinTable.class);
        if (join == null) continue;
      }

      JoinColumn[] froms = join.joinColumns();
      if (froms == null || froms.length == 0) continue;

      // 第三方关系表
      String relTable = join.name();
      // 主类在第三方关系表中的字段名
      String from = froms[0].name();

      try {
        // "update {table} set {idCol} = {newIdVal} where {idCol} = {idVal}
        // ; update {relTable} set {fromCol} = {newIdVal} where {fromCol} = {idVal}"
        final String sql1 = String.format(format, table, idColumn, newIdVal, idColumn, idVal);
        final String sql2 = String.format(format, relTable, from, newIdVal, from, idVal);
        Transaction.execute(
            new Trans() {

              @Override
              public void run(Object... args) throws Exception {
                DAOFactory.getUpdateDAO(dsName).updateBySQL(sql1);
                DAOFactory.getUpdateDAO(dsName).updateBySQL(sql2);
              }
            });

      } catch (Exception e) {
        throw new DAOException("", e);
      }
    }
  }
コード例 #2
0
  /**
   * 多对多级联查询 1.当主对象没有包含任何一个关联对象时,默认查询所有与之关联的对象 2.当主对象中包含了关联对象时(含有其id值),则只查询这些关联的对象
   *
   * @param <T>
   * @throws InvocationTargetException
   * @throws IllegalAccessException
   * @throws IllegalArgumentException
   */
  public void select() throws DAOException {
    if (this.fields == null || this.fields.size() == 0) return;
    // select %s from {tarTable} where {referencedColumn} in (select {to} from {relTable} where
    // {from} = {idVal})
    String format = "SELECT %s FROM %s WHERE %s IN (SELECT %s FROM %s WHERE %s = ?) ";
    if (idVal == null || "0".equals(idVal) || "".equals(idVal)) return;

    for (Field f : fields) {
      Method tarGetter = ru.getGetter(f.getName());
      if (tarGetter == null) continue;

      ManyToMany ann = tarGetter.getAnnotation(ManyToMany.class);
      if (ann == null) {
        ann = f.getAnnotation(ManyToMany.class);
        if (ann == null) continue;
      }

      JoinTable join = tarGetter.getAnnotation(JoinTable.class);
      if (join == null) {
        join = f.getAnnotation(JoinTable.class);
        if (join == null) continue;
      }

      JoinColumn[] froms = join.joinColumns();
      if (froms == null || froms.length == 0) continue;

      JoinColumn[] tos = join.inverseJoinColumns();
      if (tos == null || tos.length == 0) continue;

      // 多对多关系目标Class
      Class<?> tarClass = ann.targetEntity();
      if (void.class.isAssignableFrom(tarClass)) {
        tarClass = ClassUtil.getGenericType(f);
      }

      String tarTable = ORMConfigBeanUtil.getTable(tarClass, true);
      // 目标类对应的数据库表Id字段
      String referencedColumn = tos[0].referencedColumnName();
      if (referencedColumn == null || referencedColumn.trim().length() == 0)
        referencedColumn = ORMConfigBeanUtil.getIdColumn(tarClass);

      // 目标类在第三方关系表中的字段名
      String to = tos[0].name();

      // 第三方关系表
      String relTable = join.name();

      // 主类在第三方关系表中的字段名
      String from = froms[0].name();

      try {
        List<?> tarList = null;
        tarList = (List<?>) tarGetter.invoke(t);

        if (tarList != null && tarList.size() > 0) {
          for (int i = 0; i < tarList.size(); i++) {
            Object tarObj = tarList.get(i);
            ReflectUtil tarRu = new ReflectUtil(tarObj);
            String tarIdField = ORMConfigBeanUtil.getIdField(tarClass);
            Method tarIdGetter = tarRu.getGetter(tarIdField);
            Object tarIdValObj = tarIdGetter.invoke(tarObj);
            if (tarIdValObj == null) continue;
            String tarIdVal = String.valueOf(tarIdValObj);
            // 查询 select %s from {tarTable} where {tarIdColumn} = {tarIdVal}
            tarObj =
                DAOFactory.getSelectDAO(dsName)
                    .selectOne(tarClass, new String[] {tarIdField}, new String[] {tarIdVal});
          }
        } else {
          String sql =
              String.format(
                  format,
                  ORMConfigBeanUtil.getSelectAllColumn(tarClass),
                  tarTable,
                  referencedColumn,
                  to,
                  relTable,
                  from);
          // 从数据库中取出与当前主对象id关联的所有目标对象,
          tarList = DAOFactory.getSelectDAO(dsName).selectBySQL(tarClass, sql, idVal);
        }

        // 并注入到当前主对象的属性中
        Method tarSetter = ru.getSetter(f.getName());

        tarSetter.invoke(t, tarList);
      } catch (Exception e) {
        e.printStackTrace();
        throw new DAOException("", e);
      }
    }
  }
コード例 #3
0
  /**
   * 多对多级联删除 1.如果主对象不存在与数据库,不处理 2.否则,检查当前主对象中的关联对象,如果关联对象为空,则删除所有与主对象有关的关联关系。
   * 3.如果当前主对象中含有关联对象,则删除这些关联对象与主对象的关系 4.不会删除主对象
   */
  public void delete() throws DAOException {
    if (this.fields == null || this.fields.size() == 0) return;

    // "delete from {relTable} WHERE {from} = {idVal} ;"
    String format = "delete from %s WHERE %s = ? ";
    if (idVal == null || "0".equals(idVal) || "".equals(idVal)) return;
    else if (DAOFactory.getSelectDAO(dsName).selectOne(t, this.idField) == null) return;

    for (Field f : fields) {
      Method tarGetter = ru.getGetter(f.getName());
      if (tarGetter == null) continue;

      ManyToMany ann = tarGetter.getAnnotation(ManyToMany.class);
      if (ann == null) {
        ann = f.getAnnotation(ManyToMany.class);
        if (ann == null) continue;
      }

      JoinTable join = tarGetter.getAnnotation(JoinTable.class);
      if (join == null) {
        join = f.getAnnotation(JoinTable.class);
        if (join == null) continue;
      }

      JoinColumn[] froms = join.joinColumns();
      if (froms == null || froms.length == 0) continue;

      JoinColumn[] tos = join.inverseJoinColumns();
      if (tos == null || tos.length == 0) continue;

      String relTable = join.name();
      String from = froms[0].name();

      List<?> tarList = null;

      try {
        tarList = (List<?>) tarGetter.invoke(t);
      } catch (Exception e) {
        throw new DAOException(tarGetter + " invoke exception ", e);
      }

      if (tarList == null || tarList.size() == 0) {
        String sql = String.format(format, relTable, from);
        // 删除所有关联记录
        DAOFactory.getUpdateDAO(dsName).updateBySQLWithArgs(sql, idVal);
      } else {
        // 删除指定关联的记录
        String to = tos[0].name();
        Class<?> tarClass = ann.targetEntity();
        if (void.class.isAssignableFrom(tarClass)) {
          tarClass = ClassUtil.getGenericType(f);
        }

        // "delete from {relTable} where {from} = {idVal} and to = {toVal}"
        String _format = "delete from %s where %s = ? and %s = ?";
        for (int i = 0; i < tarList.size(); i++) {
          Object tarObj = tarList.get(i);
          if (tarObj == null) continue;
          ReflectUtil tarRu = new ReflectUtil(tarObj);
          String tarIdField = ORMConfigBeanUtil.getIdField(tarClass);
          Method tarIdGetter = tarRu.getGetter(tarIdField);
          Object toValObj = null;

          try {
            toValObj = tarIdGetter.invoke(tarObj);
          } catch (Exception e) {
            throw new DAOException(tarIdGetter + "invoke exception ", e);
          }

          if (toValObj == null) continue;

          String toVal = String.valueOf(toValObj);
          if (DAOFactory.getSelectDAO(dsName)
                  .selectOne(tarClass, new String[] {tarIdField}, new String[] {toVal})
              == null) continue;

          String _sql = String.format(_format, relTable, from, to);
          DAOFactory.getUpdateDAO(dsName).updateBySQLWithArgs(_sql, idVal, toVal);
        }
      }
    }
  }