Question

我不完全确定为什么会这样。当我运行命令时：

 ALTER TRIGGER ORIGDV87.UPDATE_TEAM_GROUP_TRIGGER DISABLE/ENABLE

我可以看到它如何改变触发器。我试图从java编写这个：

private void trigger_alter(Connection con, String flag) throws Exception
{
    Query query = new Query(con);
    String selectSql = "select table_owner, trigger_name from user_triggers";
    Query queryTrg = new Query(con);
    query.executeQuery(selectSql);
     while(query.next()) {
        int i = 0;
        String table_owner = query.getColValue("table_owner");
        String trigger_name = query.getColValue("trigger_name");
        String triggerSql = "ALTER TRIGGER " + table_owner + "." + trigger_name + " "+ flag  ;
        System.out.println( triggerSql);
        queryTrg.executeQuery(triggerSql);
    }
    log_obj.FmtAndLogMsg("All triggers have been " + flag+ "D");
}

我得到了这个例外：2013/02/26 10:38:56.795 TableConverter: ERROR main() occurred: java.lang.Exception: Error executing query: ALTER TRIGGER XXXX.UPDATE_TEAM_GROUP_TRIGGER DISABLE error=java.sql.SQLException: ORA-01003: no statement parsed

它是一个oracle数据库，我在Solaris机器上尝试这个。

Answer 1

首先，您正在使用不是查询的语句执行executeQuery。请尝试使用execute。

无论如何，ALTER语句是DDL（数据定义语言）的一部分（SQL用于查询，DML -Data Manipulation Language-用于插入/更新/删除）。我不确定JDBC中支持DDL的程度如何。

Answer 2

替换

queryTrg.executeQuery(triggerSql);

使用

con.createStatement().execute(triggerSql);

但是，对ALTER TRIGGER语句进行批处理会更好：

private void trigger_alter(Connection con, String flag) throws Exception
{
    Query query = new Query(con);
    String selectSql = "select table_owner, trigger_name from user_triggers";

    Statement trgStmt = con.createStatement();

    query.executeQuery(selectSql);
     while(query.next()) {
        int i = 0;
        String table_owner = query.getColValue("table_owner");
        String trigger_name = query.getColValue("trigger_name");
        String triggerSql = "ALTER TRIGGER " + table_owner + "." + trigger_name + " "+ flag  ;
        System.out.println( triggerSql);
        trgStmt.addBatch(triggerSql);
    }

    trgStmt.executeBatch();
    log_obj.FmtAndLogMsg("All triggers have been " + flag+ "D");
}

从java禁用触发器

2 个答案: