详细讲解IBM DB2的数据复制和迁移方法

背景：

需要更改数据库表空间，或者需要将数据库中所有表的数据迁移到一个新的数据库中。

步骤：

1.通过db2控制台(db2cc)选中源数据库中的所有表，将其导出成DDL脚本；

2.根据需要对脚本进行必要的修改，譬如更改表空间为GATHER；

3.新建数据库，新建DMS表空间：GATHER；

4.将DDL脚本在此数据库中执行；

5.编写代码查询源数据库中的所有表，自动生成export脚本；

6.编写代码查询源数据库中的所有表，自动生成import脚本；

7.连接源数据库执行export脚本；

8.连接目标数据库执行import脚本；

附录1:生成export脚本代码示例：

/**

* 创建导出脚本

* @param conn

* @param creator　表创建者

* @param filePath

*/

public void createExportFile(Connection conn,String creator,String filePath) throws Exception {

DBBase dbBase = new DBBase(conn);

String selectTableSql = "select name from sysibm.systables where creator = '" + creator + "' and type='T'";

try {

dbBase.executeQuery(selectTableSql);

} catch (Exception ex) {

throw ex;

} finally {

dbBase.close();

}

DBResult result = dbBase.getSelectDBResult();

List list = new ArrayList();

while (result.next()) {

String table = result.getString(1);

list.add(table);

}

StringBuffer sb = new StringBuffer();

String enterFlag = "\r\n";

for (int i = 0; i < list.size();i++) {

String tableName = (String)list.get(i);

sb.append("db2 \"export to aa" + String.valueOf(i+1)+ ".ixf of ixf select * from " + tableName + "\"");

sb.append(enterFlag);

}

String str = sb.toString();

FileUtility.saveStringToFile(filePath, str, false);

}

附录2:生成import脚本代码示例:

/**

* 创建装载脚本

* @param conn

* @param creator　表创建者

* @param filePath

*/

public void createLoadFile(Connection conn,String creator,String filePath) throws Exception {

DBBase dbBase = new DBBase(conn);

String selectTableSql = "select name from sysibm.systables where creator = '" + creator + "' and type='T'";

try {

dbBase.executeQuery(selectTableSql);

} catch (Exception ex) {

throw ex;

} finally {

dbBase.close();

}

DBResult result = dbBase.getSelectDBResult();

List list = new ArrayList();

while (result.next()) {

String table = result.getString(1);

list.add(table);

}

StringBuffer sb = new StringBuffer();

String enterFlag = "\r\n";

for (int i = 0; i < list.size();i++) {

String tableName = (String)list.get(i);

sb.append("db2 \"load from aa" + String.valueOf(i+1)+ ".ixf of ixf into " + tableName + " COPY NO without prompting \"");

sb.append(enterFlag);

}

String str = sb.toString();

FileUtility.saveStringToFile(filePath, str, false);

}

附录3:export脚本示例

db2 connect to testdb user test password test

db2 "export to aa1.ixf of ixf select * from table1"

db2 "export to aa2.ixf of ixf select * from table2"

db2 connect reset

附录4:import脚本示例

db2 connect to testdb user test password test

db2 "load from aa1.ixf of ixf replace into table1 COPY NO without prompting "

db2 "load from aa2.ixf of ixf replace into table2 COPY NO without prompting "

db2 connect reset