expdp 字符集从ZHS16GBK到AL32UTF8

源oracle数据库是GBK字符集，目标库是UTF8字符集，现在需要将源库的一个表空间数据导入到目标库。我的解决方法有点繁琐，首先直接导出源库的表空间

expdp trmuser/trmpass schemas=trmuser DIRECTORY=ORACLEDMP dumpfile=trmpass-$(date +%Y%m%d).dmp;

　　然后在目标库导入表空间

 impdp trmuser/trmpass remap_schema=trmuser:trmuser remap_tablespace=trm_data:trm_data DIRECTORY=ORACLEDMP dumpfile=trmpass-20190109.dmp table_exists_ac
tion=replace parallel=4 logfile=trmuser.log

　　导入后查看错误日志trmuser.log，然后执行程序，生成源库所要扩字段的SQL语句。

　　TableObject.java

package com.efounder.sdu.test;

public class TableObject {
    // 表名
    String tableName;
    // 字段名
    String columnName;

    // 原先最大值
    Integer oldMaxSize;
    // 现最大值
    Integer maxSize;
    Integer lineNum;
    // 修改字段的sql
    String sql;

    public Integer getLineNum() {
        return lineNum;
    }

    public void setLineNum(Integer lineNum) {
        this.lineNum = lineNum;
    }

    public String getSql() {
        return sql;
    }

    public void setSql(String sql) {
        this.sql = sql;
    }

    public String getTableName() {
        return tableName;
    }

    public void setTableName(String tableName) {
        this.tableName = tableName;
    }

    public String getColumnName() {
        return columnName;
    }

    public void setColumnName(String columnName) {
        this.columnName = columnName;
    }

    public Integer getMaxSize() {
        return maxSize;
    }

    public void setMaxSize(Integer maxSize) {
        this.maxSize = maxSize;
    }

    public Integer getOldMaxSize() {
        return oldMaxSize;
    }

    public void setOldMaxSize(Integer oldMaxSize) {
        this.oldMaxSize = oldMaxSize;
    }
}

　　CWZTTest4.java（根据自己用户表空间信息进行修改）

package com.efounder.sdu.test;

import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * todo
 *
 * @author wangxin
 * @version 2018/12/22 22:34
 */
public class CWZTTest4 {

    public static String SPACE = " ";

    public static void main(String[] args) throws Exception {
        String format = "yyyy-MM-dd HHmm";
        SimpleDateFormat sdf = new SimpleDateFormat(format);

        Long time = System.currentTimeMillis();
        String timeSuffix = "————" + sdf.format(new Date(Long.valueOf(time)));

        String localFilePath = "D:\\ChangeColumnLengthSql\\";
        // CHANGE ME-1
        String logName = "trm_impdp_20181223";
        String logFileName = localFilePath + logName + ".log";
        String outputFileName = localFilePath + logName + timeSuffix + ".txt";

        // CHANGE ME-2
        String oldUsername = "trmuser";
        // CHANGE ME-3
        String newUsername = "trmuser";

        String oldTablespaceName = "trm_data";
        String newTablespaceName = "trm_data";
        String newDirectory = "trm_dir";

        System.out.println(outputFileName);
        analyseLog(logFileName, outputFileName, oldUsername, newUsername, oldTablespaceName, newTablespaceName, newDirectory);
    }

    private static void analyseLog(String logFileName, String outputFileName, String oldUsername, String newUsername, String oldTablespaceName, String newTablespaceName, String newDirectory) throws Exception {
//        String path = "F:\\gateway\\gateway_impdp_20181225.log";
        String path = logFileName;

        File file = new File(path);
        InputStreamReader reader = new InputStreamReader(
                new FileInputStream(file));
        BufferedReader br = new BufferedReader(reader);
        String line = "";
        line = br.readLine();

        Map<String, TableObject> map = new LinkedHashMap<>();

        while (line != null) {
            String tableNameLine = "";
            String columnAndSizeLine = "";
            if (line.indexOf("ORA-02374") >= 0) {
                tableNameLine = line;
                line = br.readLine();
                columnAndSizeLine = line;
                String tableName = tableNameLine.split("\"")[3];
                String[] columnSize = columnAndSizeLine.split("ORA-12899: value too large for column |[ (]|maximum: |[)]");
                String columnName = columnSize[1];
                String oldMaxSzieStr = columnSize[6];
                Integer maxSize = Integer.parseInt(oldMaxSzieStr) * 2;

                String sql = "";
                sql += "ALTER TABLE " + tableName + " MODIFY (" + columnName + " VARCHAR2(" + maxSize + "));\r\n";
                sql += "UPDATE SYS_OBJCOLS SET COL_LEN = '" + maxSize + "' WHERE OBJ_ID = '" + tableName + "' AND COL_ID ='" + columnName + "';\r\n";
                sql += "\r\n";

                TableObject tableObject = new TableObject();
                tableObject.setTableName(tableName);
                tableObject.setColumnName(columnName);
                tableObject.setMaxSize(maxSize);
                tableObject.setSql(sql);

                map.put(tableName + "-" + columnName, tableObject);
            }
            line = br.readLine();
        }

        File outputFile = new File(outputFileName);

        OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(outputFile));
        BufferedWriter bufferedWriter = new BufferedWriter(writer);

        for (TableObject to : map.values()) {
            bufferedWriter.write(to.getSql());
        }

        bufferedWriter.close();

        Set<String> set = map.keySet();

        StringBuilder sb = new StringBuilder();
        StringBuilder sb2 = new StringBuilder();

        List<String> tableList = new ArrayList<>();
        for (String s : set) {
            String table = s.split("-")[0];
            tableList.add(table);
            sb.append(table);
            sb.append(",");
            sb2.append(oldUsername + "." + table);
            sb2.append(",");
        }

        String sqlStr = sb.toString();
        sqlStr = sqlStr.substring(0, sqlStr.length() - 1);

        String sqlStr2 = sb2.toString();
        sqlStr2 = sqlStr2.substring(0, sqlStr2.length() - 1);

        String expdp = "expdp " + oldUsername + "/zjtest TABLES=" +
                sqlStr +
                SPACE +
                "DIRECTORY=ORACLEDMP" +
                SPACE +
                "dumpfile=" + newUsername + "_uat_expdp_tableadd.dmp" +
                SPACE +
                "logfile=" + newUsername + "_expdp_tableadd.log";

        System.out.println(expdp + "\r\n");

        String impdp = "impdp " + newUsername + "/pansoft2019 TABLES=" +
                sqlStr2 +
                SPACE +
                "remap_schema=" + oldUsername + ":" + newUsername +
                SPACE +
                "remap_tablespace=" + oldTablespaceName + ":" + newTablespaceName +
                SPACE +
                "DIRECTORY=" + newDirectory + "" +
                SPACE +
                "dumpfile=" + newUsername + "_uat_expdp_tableadd.dmp" +
                SPACE +
                "table_exists_action=replace" +
                SPACE +
                "logfile=" + newUsername + "_expdp_tableadd.log";

        System.out.println(impdp);
    }
}

　　生成扩充字段SQL语句示例：

ALTER TABLE ZJ_JYMX MODIFY (F_FX VARCHAR2(4));
UPDATE SYS_OBJCOLS SET COL_LEN = '4' WHERE OBJ_ID = 'ZJ_JYMX' AND COL_ID ='F_FX';

ALTER TABLE ZJ_JYMX MODIFY (F_DFDW VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_JYMX' AND COL_ID ='F_DFDW';

ALTER TABLE ZJ_NBCDYWXX MODIFY (F_DFDW VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_NBCDYWXX' AND COL_ID ='F_DFDW';

ALTER TABLE ZJ_DBXX MODIFY (F_YHMC VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_DBXX' AND COL_ID ='F_YHMC';

ALTER TABLE ZJ_DBYWXX MODIFY (F_YHMC VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_DBYWXX' AND COL_ID ='F_YHMC';

ALTER TABLE ZJ_HSZHZL MODIFY (F_FKZY VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_HSZHZL' AND COL_ID ='F_FKZY';

ALTER TABLE ZJ_NBCDFDLL MODIFY (F_SJDW VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_NBCDFDLL' AND COL_ID ='F_SJDW';

ALTER TABLE ZJ_NBDCZQ MODIFY (F_SJDW VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_NBDCZQ' AND COL_ID ='F_SJDW';

ALTER TABLE ZJ_PJSQXX MODIFY (F_CPRZH_YH VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_PJSQXX' AND COL_ID ='F_CPRZH_YH';

ALTER TABLE ZJ_SXFL MODIFY (F_SXHT VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_SXFL' AND COL_ID ='F_SXHT';

ALTER TABLE ZJ_SXHTFS MODIFY (F_HTBH VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_SXHTFS' AND COL_ID ='F_HTBH';

ALTER TABLE ZJ_SXHTPZ MODIFY (F_HTBH VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_SXHTPZ' AND COL_ID ='F_HTBH';

ALTER TABLE ZJ_SXYWXX MODIFY (F_DWMC VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_SXYWXX' AND COL_ID ='F_DWMC';

ALTER TABLE ZJ_SXYWXX MODIFY (F_JGMC VARCHAR2(120));
UPDATE SYS_OBJCOLS SET COL_LEN = '120' WHERE OBJ_ID = 'ZJ_SXYWXX' AND COL_ID ='F_JGMC';

ALTER TABLE ZJ_TZHEAD MODIFY (F_XMMC VARCHAR2(100));
UPDATE SYS_OBJCOLS SET COL_LEN = '100' WHERE OBJ_ID = 'ZJ_TZHEAD' AND COL_ID ='F_XMMC';

ALTER TABLE ZJ_BHSQXX MODIFY (F_KZYHFHMC VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_BHSQXX' AND COL_ID ='F_KZYHFHMC';

ALTER TABLE ZJ_BHSQXX MODIFY (F_SYRMC VARCHAR2(80));
UPDATE SYS_OBJCOLS SET COL_LEN = '80' WHERE OBJ_ID = 'ZJ_BHSQXX' AND COL_ID ='F_SYRMC';

ALTER TABLE ZJ_FKZLB MODIFY (F_FK_ZHMC VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_FKZLB' AND COL_ID ='F_FK_ZHMC';

ALTER TABLE BIZ_MONITOR MODIFY (F_LXMC VARCHAR2(120));
UPDATE SYS_OBJCOLS SET COL_LEN = '120' WHERE OBJ_ID = 'BIZ_MONITOR' AND COL_ID ='F_LXMC';

ALTER TABLE MDM_ITEM MODIFY (F_CHAR6 VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'MDM_ITEM' AND COL_ID ='F_CHAR6';

ALTER TABLE ZJ_BHYWXX MODIFY (F_SQSY VARCHAR2(2000));
UPDATE SYS_OBJCOLS SET COL_LEN = '2000' WHERE OBJ_ID = 'ZJ_BHYWXX' AND COL_ID ='F_SQSY';

ALTER TABLE ZJ_JNJSXX MODIFY (F_FK_JGMC VARCHAR2(120));
UPDATE SYS_OBJCOLS SET COL_LEN = '120' WHERE OBJ_ID = 'ZJ_JNJSXX' AND COL_ID ='F_FK_JGMC';

ALTER TABLE ZJ_NBCDXX MODIFY (F_SJDW VARCHAR2(60));
UPDATE SYS_OBJCOLS SET COL_LEN = '60' WHERE OBJ_ID = 'ZJ_NBCDXX' AND COL_ID ='F_SJDW';

　　然后在源库执行SQL语句进行扩充字段

  sqlplus trmuser/trmpass@10.20.31.201:1521/orcl

　　在源库扩充完字段后重新导出数据，然后我选择最直接的方法目标库直接重建表空间然后重新导入，字符不一致问题解决。