Java ColumnFamilyTemplate.deleteColumn方法代码示例

import me.prettyprint.cassandra.service.template.ColumnFamilyTemplate; //导入方法依赖的package包/类
/**
 * Deletes a given column value of a row identified by the key.
 *
 * @param key        - key of the row.
 * @param columnName - name of the column to be deleted.
 */
public void deleteColumn(K key, String columnName) {
	final ColumnFamilyTemplate<K, String> columnFamily1 = getColumnFamily();
	final HColumn<String, String> oldValue = readColumn(key, columnName);

	// is this insertion involves a change to secondary indexes
	if (isSecondaryIndexByColumnNameAndValueEnabled && Collections.binarySearch(columnsToIndexOnColumnNameAndValue,
			columnName) >= 0 &&
			oldValue != null) {
		secondaryIndexedColumnFamilyTemplate.deleteColumn(getSecondaryIndexKey(columnName, oldValue.getValue()),
				key);
	}

	if (isSecondaryIndexesByColumnNamesEnabled && columnName.matches(secondaryIdxByColumnPattern)) {
		secondaryIndexedColumnFamilyTemplate.deleteColumn(getSecondaryIndexKey(columnName, ""), key);
	}

	columnFamily1.deleteColumn(key, columnName);
}
 

import me.prettyprint.cassandra.service.template.ColumnFamilyTemplate; //导入方法依赖的package包/类
/**
 * Deletes a user by userName.
 */
@Override
public void doDeleteUser(String userName) throws UserStoreException {

    Mutator<Composite> mutator = HFactory.createMutator(keyspace, CompositeSerializer.get());
    String[] roles = doGetExternalRoleListOfUser(userName, "");
    for (String role : roles) {
        Composite key = new Composite();
        key.addComponent(role, stringSerializer);
        key.addComponent(tenantIdString, stringSerializer);
        ColumnFamilyTemplate<Composite, String> userCFTemplate = new ThriftColumnFamilyTemplate<Composite, String>(
                keyspace, CFConstants.UM_ROLE_USER_INDEX, CompositeSerializer.get(), StringSerializer.get());
        try {
            userCFTemplate.deleteColumn(key, userName);
        } catch (HectorException e) {
            log.error("Error during deletion ", e);
        }
    }

    Composite userKey = new Composite();
    userKey.addComponent(userName, stringSerializer);
    userKey.addComponent(tenantIdString, stringSerializer);
    mutator.addDeletion(userKey, CFConstants.UM_USER_ROLE, null, CompositeSerializer.get());
    mutator.addDeletion(userKey, CFConstants.UM_USER, null, CompositeSerializer.get());
    mutator.execute();

    if (log.isDebugEnabled()) {
        log.debug("Deleted user " + userName + " successfully");
    }
}
 

import me.prettyprint.cassandra.service.template.ColumnFamilyTemplate; //导入方法依赖的package包/类
/**
 * Update the user list mapped to a role.
 */
@Override
public void doUpdateUserListOfRole(String roleName, String[] deletedUsers, String[] newUsers)
        throws UserStoreException {

    Mutator<Composite> mutator = HFactory.createMutator(keyspace, CompositeSerializer.get());
    RoleContext ctx = createRoleContext(roleName);
    roleName = ctx.getRoleName();
    boolean isShared = ctx.isShared();
    if (!isShared) {
        //TODO TO BE Implemented
    }
    if (deletedUsers != null && deletedUsers.length > 0) {
        if (isShared) {
            //TODO TO BE Implemented
        } else {
            if (deletedUsers.length > 0) {
                Composite key = new Composite();
                key.addComponent(roleName, stringSerializer);
                key.addComponent(tenantIdString, stringSerializer);

                for (String user : deletedUsers) {

                    Composite userKey = new Composite();
                    userKey.addComponent(user, stringSerializer);
                    userKey.addComponent(tenantIdString, stringSerializer);

                    ColumnFamilyTemplate<Composite, String> userCFTemplate = new ThriftColumnFamilyTemplate<Composite, String>(
                            keyspace, CFConstants.UM_USER_ROLE, CompositeSerializer.get(), StringSerializer.get());
                    ColumnFamilyTemplate<Composite, String> roleCFTemplate = new ThriftColumnFamilyTemplate<Composite, String>(
                            keyspace, CFConstants.UM_ROLE_USER_INDEX, CompositeSerializer.get(),
                            StringSerializer.get());
                    try {
                        roleCFTemplate.deleteColumn(mutator, key, user);
                        userCFTemplate.deleteColumn(mutator, userKey, roleName);
                    } catch (HectorException e) {
                        log.error(e.getMessage(), e);
                        throw new UserStoreException("Error during the updating of a user's role list");
                    }
                }
            }

        }
    }
    // need to clear user roles cache upon roles update
    clearUserRolesCacheByTenant(this.tenantId);

    if (newUsers != null && newUsers.length > 0) {
        if (isShared) {
            //TODO TO BE Implemented
        } else {
            addRoleToUsersList(newUsers, roleName, mutator);
        }
    }
    mutator.execute();

}
 

import me.prettyprint.cassandra.service.template.ColumnFamilyTemplate; //导入方法依赖的package包/类
private void delete(ColumnFamilyTemplate<String, String> template) {
    ColumnFamilyResult<String, String> res = template.queryColumns("a key");
    String value = res.getString("domain");
    template.deleteColumn("key", "column name");
}