执行更新失败并出现 RELATION 错误

问题描述

这是原始代码的样子:

    boolean passed = false;
    Statement statement = null;
    Connection conn = null;

    try 
    {
        Class.forName("org.postgresql.Driver");
        conn = DriverManager.getConnection(DBURL,DBUser,DBPassword);
        conn.setAutoCommit(false);
        statement = conn.createStatement();
        statement.executeUpdate("update tableName set value_start_time = TO_TIMESTAMP('01/" + MonthNumber + "/" + Year + " 11:12:13','DD/MM/YYYY HH24:MI:SS')");
        statement.close();
        conn.commit();
        conn.close();
    }
    catch (Exception ex)
    {
        //Handle Exception
    }

以上代码有效..

我将代码重构为:

功能 1:

public boolean setupDatabaseConnection() throws ClassNotFoundException,sqlException,TestException
    {
        try
        {   
            Class.forName("org.postgresql.Driver");
            dbConnection = DriverManager.getConnection(dbURL,dbUsername,dbPassword);
        }
        catch(Exception e)
        {
            //Handle Exception
        }
        
        return true;
    }

功能 #2:

public boolean UpdateTableInPostgresDB(String MonthNumber,String Year) throws ClassNotFoundException,TestException
    {
        setupDatabaseConnection();
        
        try 
        {
            dbConnection.setAutoCommit(false);

            PreparedStatements("Update This Table");
            dbPreparedStatement.setString(1,"01/" + MonthNumber + "/" + Year + " 11:12:13");
            dbPreparedStatement.setString(2,"DD/MM/YYYY HH24:MI:SS");
            dbPreparedStatement.executeUpdate();

            dbConnection.commit();
         }
         catch (Exception e)
         {            
            //Handle Exception            
         }

         return true;
    }

功能 #3

public boolean PreparedStatements(String statementToUse) throws ClassNotFoundException,TestException
    {
       try
       {
           switch(statementToUse.toLowerCase())
           {
                case "update this table" :
                {
                  dbQuery = "update tableName set value_start_time = TO_TIMESTAMP(?,?)";
                  break;
                }
           }

           dbPreparedStatement = dbConnection.prepareStatement(dbQuery);

       {
       catch (Exception ex)
       {
          //Handle Exception
       }

现在它在功能 #2 在我需要执行此操作的行中失败:

dbPreparedStatement.executeUpdate();

被捕获的异常是:

错误:关系“tableName”不存在位置:8

老实说,我不知道为什么这行不通。我使用相同的预处理语句函数执行了很多其他 sql 查询

解决方法

希望您在正确的情况下使用表名,因为 Postgres 对数据库对象区分大小写,例如。如果您使用“tabeName”,则“tablename”是不同的

如果适用,请确保在表名称中包含架构名称