DataX-Oracle新增writeMode支持update

{
    "job": {
        "setting": {
            "speed": {
                "channel": 1
            }
        },
        "content": [
            {
                "reader": {
                    "name": "oraclereader",
                    "parameter": {
                        "username": "your_username",
                        "password": "your_password",
                        "column": ["id", "name", "age"],
                        "splitPk": "id",
                        "connection": [
                            {
                                "querySql": [
                                    "select id, name, age from your_table where ..."
                                ],
                                "jdbcUrl": [
                                    "jdbc:oracle:thin:@//host:port/SID"
                                ]
                            }
                        ]
                    }
                },
                "writer": {
                    "name": "oraclewriter",
                    "parameter": {
                        "username": "your_username",
                        "password": "your_password",
                        "writeMode": "update", // 使用update模式
                        "session": ["set autocommit=true"], // 启用自动提交
                        "preSql": ["truncate table your_target_table"], // 可选：在写入前清空目标表
                        "connection": [
                            {
                                "jdbcUrl": "jdbc:oracle:thin:@//host:port/SID",
                                "table": ["your_target_table"]
                            }
                        ],
                        "column": [
                            {
                                "name": "id",
                                "type": "int"
                            },
                            {
                                "name": "name",
                                "type": "string"
                            },
                            {
                                "name": "age",
                                "type": "int"
                            }
                        ]
                    }
                }
            }
        ]
    }
}

这个JSON配置文件定义了一个DataX作业，它从一个Oracle数据源读取数据，并使用oraclewriter插件以update模式将数据写入到目标Oracle数据表中。在写入前，它会清空目标表（这