在oracle数据库迁移至mysql数据库，除了oracle数据库模型移到mysql外，还一个重点环节就是要将oracle数据库的数据移到mysql数据库，本人尝试用过多个数据迁移程序，性能都不是很好的，于是自己动手写一个针对于oracle数据库数据迁移到mysql数据程序，其详细过程如下：

1、要抽取mysql表、字段及过滤条件的配制文件imp_data.sql

2、建立一个目录ETL_DIR

3、运行oracle数据库程序P_ETL_ORA_DATA，生成各表的csv数据文件，同时也生成一个导入mysql的脚本文件imp_data.sql

4、导入mysql数据，文件内容如下

load data infile "alarm_hist_inc.csv" into table alarm_hist_inc fields terminated by "," enclosed by "^" lines terminated by "\r\n";

load data infile "button_authority.csv" into table button_authority fields terminated by "," enclosed by "^" lines terminated by "\r\n";

load data infile "c3_sms_hist_inc.csv" into table c3_sms_hist_inc fields terminated by "," enclosed by "^" lines terminated by "\r\n";

load data infile "datapermisson.csv" into table datapermisson fields terminated by "," enclosed by "^" lines terminated by "\r\n";

附：数据库脚本P_ETL_ORA_DATA

CREATE OR REPLACE PROCEDURE P_ETL_ORA_DATA

(

P_ORA_DIR VARCHAR2,

P_DATA_PATH VARCHAR2

) IS

TYPE T_REC IS RECORD(

TBN VARCHAR2(40),

WHR VARCHAR2(4000));

TYPE T_TABS IS TABLE OF T_REC;

V_TABS T_TABS := T_TABS();

V_ETL_DIR VARCHAR2(40) := P_ORA_DIR;

V_LOAD_FILE UTL_FILE.FILE_TYPE;

PROCEDURE ETL_DATA

(

P_SQL_STMT VARCHAR2,

P_DATA_PATH VARCHAR2,

P_TB_NAME VARCHAR2

) IS

BEGIN

DECLARE

V_VAR_COL VARCHAR2(32767);

V_NUM_COL NUMBER;

V_DATE_COL DATE;

V_TMZ TIMESTAMP;

V_COLS NUMBER;

V_COLS_DESC DBMS_SQL.DESC_TAB;

V_ROW_STR VARCHAR2(32767);

V_COL_STR VARCHAR2(32767);

V_SQL_ID NUMBER;

V_SQL_REF SYS_REFCURSOR;

V_EXP_FILE UTL_FILE.FILE_TYPE;

V_DATA_PATH VARCHAR2(200);

BEGIN

V_DATA_PATH := P_DATA_PATH;

IF REGEXP_SUBSTR(V_DATA_PATH, '\\$') IS NULL

THEN

V_DATA_PATH := V_DATA_PATH || '\';

END IF;

V_DATA_PATH := REPLACE(V_DATA_PATH, '\', '\\');

OPEN V_SQL_REF FOR P_SQL_STMT;

V_SQL_ID := DBMS_SQL.TO_CURSOR_NUMBER(V_SQL_REF);

DBMS_SQL.DESCRIBE_COLUMNS(V_SQL_ID, V_COLS, V_COLS_DESC);

FOR I IN V_COLS_DESC.FIRST .. V_COLS_DESC.LAST

LOOP

CASE

WHEN V_COLS_DESC(I).COL_TYPE IN (1, 9, 96) THEN

DBMS_SQL.DEFINE_COLUMN(V_SQL_ID, I, V_VAR_COL, 32767);

WHEN V_COLS_DESC(I).COL_TYPE = 2 THEN

DBMS_SQL.DEFINE_COLUMN(V_SQL_ID, I, V_NUM_COL);

WHEN V_COLS_DESC(I).COL_TYPE = 12 THEN

DBMS_SQL.DEFINE_COLUMN(V_SQL_ID, I, V_DATE_COL);

WHEN V_COLS_DESC(I).COL_TYPE = 180 THEN

DBMS_SQL.DEFINE_COLUMN(V_SQL_ID, I, V_TMZ);

END CASE;

END LOOP;

DECLARE

V_FLUSH_OVER PLS_INTEGER := 1;

V_FILE_OVER PLS_INTEGER := 1;

V_FILE_NO PLS_INTEGER := 1;

V_FILE_NAME VARCHAR2(200);

V_LINE VARCHAR2(400);

BEGIN

WHILE DBMS_SQL.FETCH_ROWS(V_SQL_ID) > 0

LOOP

IF V_FILE_OVER = 1

THEN

V_FILE_NAME := P_TB_NAME || '_' || V_FILE_NO || '.csv';

V_EXP_FILE := UTL_FILE.FOPEN(V_ETL_DIR, V_FILE_NAME, OPEN_MODE => 'w', MAX_LINESIZE => 32767);

END IF;

V_ROW_STR := '';

FOR I IN 1 .. V_COLS

LOOP

V_COL_STR := '\N';

BEGIN

CASE

WHEN V_COLS_DESC(I).COL_TYPE IN (1, 9, 96) THEN

DBMS_SQL.COLUMN_VALUE(V_SQL_ID, I, V_VAR_COL);

IF V_VAR_COL IS NOT NULL

THEN

V_COL_STR := '^' || V_VAR_COL || '^';

END IF;

WHEN V_COLS_DESC(I).COL_TYPE = 2 THEN

DBMS_SQL.COLUMN_VALUE(V_SQL_ID, I, V_NUM_COL);

IF V_NUM_COL IS NOT NULL

THEN

V_COL_STR := V_NUM_COL;

END IF;

WHEN V_COLS_DESC(I).COL_TYPE = 12 THEN

DBMS_SQL.COLUMN_VALUE(V_SQL_ID, I, V_DATE_COL);

IF V_DATE_COL IS NOT NULL

THEN

V_COL_STR := '^' || TO_CHAR(V_DATE_COL, 'yyyy-mm-dd hh24:mi:ss') || '^';

END IF;

WHEN V_COLS_DESC(I).COL_TYPE IN (180, 181, 231) THEN

DBMS_SQL.COLUMN_VALUE(V_SQL_ID, I, V_TMZ);

IF V_TMZ IS NOT NULL

THEN

V_COL_STR := '^' || TO_CHAR(V_TMZ, 'yyyy-mm-dd hh24:mi:ss.ff6') || '^';

END IF;

END CASE;

IF I = 1

THEN

V_ROW_STR := V_COL_STR;

ELSE

V_ROW_STR := V_ROW_STR || ',' || V_COL_STR;

END IF;

END;

END LOOP;

UTL_FILE.PUT_LINE(V_EXP_FILE, CONVERT(V_ROW_STR, 'UTF8'));

IF V_FILE_OVER > 200000 /*每200000条记录就产生一个新版的文件*/

THEN

V_FILE_OVER := 1;

V_FLUSH_OVER := 1;

V_FILE_NO := V_FILE_NO + 1;

UTL_FILE.FCLOSE(V_EXP_FILE);

V_LINE := 'load data infile "' || V_DATA_PATH || V_FILE_NAME || '" into table ' || P_TB_NAME;

V_LINE := V_LINE || ' fields terminated by "," enclosed by "^" lines terminated by "\r\n";';

UTL_FILE.PUT_LINE(V_LOAD_FILE, V_LINE);

UTL_FILE.FFLUSH(V_LOAD_FILE);

CONTINUE;

END IF;

V_FILE_OVER := V_FILE_OVER + 1;

IF V_FLUSH_OVER > 2000 /*每2000条记录就刷新版缓存，写到文件中 */

THEN

UTL_FILE.FFLUSH(V_EXP_FILE);

V_FLUSH_OVER := 1;

ELSE

V_FLUSH_OVER := V_FLUSH_OVER + 1;

END IF;

END LOOP;

DBMS_SQL.CLOSE_CURSOR(V_SQL_ID);

IF UTL_FILE.IS_OPEN(V_EXP_FILE)

THEN

UTL_FILE.FCLOSE(V_EXP_FILE);

V_LINE := 'load data infile "' || V_DATA_PATH || V_FILE_NAME || '" into table ' || P_TB_NAME;

V_LINE := V_LINE || ' fields terminated by "," enclosed by "^" lines terminated by "\r\n";';

UTL_FILE.PUT_LINE(V_LOAD_FILE, V_LINE);

UTL_FILE.FFLUSH(V_LOAD_FILE);

END IF;

END;

EXCEPTION

WHEN OTHERS THEN

IF DBMS_SQL.IS_OPEN(V_SQL_ID)

THEN

DBMS_SQL.CLOSE_CURSOR(V_SQL_ID);

END IF;

IF UTL_FILE.IS_OPEN(V_EXP_FILE)

THEN

UTL_FILE.FCLOSE(V_EXP_FILE);

END IF;

DBMS_OUTPUT.PUT_LINE(SQLERRM);

DBMS_OUTPUT.PUT_LINE(P_SQL_STMT);

END;

END;

BEGIN

BEGIN

EXECUTE IMMEDIATE 'create table mysql_etl_tbs(tn varchar2(40),cn varchar2(40),ci number) ';

EXCEPTION

WHEN OTHERS THEN

NULL;

END;

EXECUTE IMMEDIATE 'truncate table mysql_etl_tbs';

DECLARE

V_CI PLS_INTEGER;

V_CN VARCHAR2(40);

V_ETL_COLS VARCHAR2(32767);

V_TBN VARCHAR2(30);

V_ETL_CFG VARCHAR2(32767);

V_CNF_FILE UTL_FILE.FILE_TYPE;

V_FROM_POS PLS_INTEGER;

BEGIN

V_CNF_FILE := UTL_FILE.FOPEN(V_ETL_DIR, 'ETL_TABS.CNF', 'r', 32767);

LOOP

UTL_FILE.GET_LINE(V_CNF_FILE, V_ETL_CFG, 32767);

V_FROM_POS := REGEXP_INSTR(V_ETL_CFG, 'from', 1, 1, 0, 'i');

V_ETL_COLS := SUBSTR(V_ETL_CFG, 1, V_FROM_POS - 1);

V_ETL_COLS := REGEXP_SUBSTR(V_ETL_COLS, '(select)(.+)', 1, 1, 'i', 2);

V_TBN := REGEXP_SUBSTR(V_ETL_CFG, '(\s+from\s+)(\w+)(\s*)', 1, 1, 'i', 2);

V_TBN := UPPER(V_TBN);

V_TABS.EXTEND();

V_TABS(V_TABS.LAST).TBN := V_TBN;

V_TABS(V_TABS.LAST).WHR := REGEXP_SUBSTR(V_ETL_CFG, '\s+where .+', 1, 1, 'i');

V_CI := 1;

LOOP

V_CN := REGEXP_SUBSTR(V_ETL_COLS, '\S+', 1, V_CI);

EXIT WHEN V_CN IS NULL;

V_CN := UPPER(V_CN);

EXECUTE IMMEDIATE 'insert into mysql_etl_tbs(tn,cn,ci) values(:1,:2,:3)'

USING V_TBN, V_CN, V_CI;

COMMIT;

V_CI := V_CI + 1;

END LOOP;

END LOOP;

EXCEPTION

WHEN UTL_FILE.INVALID_PATH THEN

DBMS_OUTPUT.PUT_LINE('指定的目录：ETL_DIR"' || '"无效！');

RETURN;

WHEN UTL_FILE.INVALID_FILENAME THEN

DBMS_OUTPUT.PUT_LINE('指定的文件：" ETL_TABS.CNF' || '"无效！');

RETURN;

WHEN NO_DATA_FOUND THEN

UTL_FILE.FCLOSE(V_CNF_FILE);

WHEN OTHERS THEN

DBMS_OUTPUT.PUT_LINE(SQLERRM);

RETURN;

END;

DECLARE

V_CUR_MATCH SYS_REFCURSOR;

V_SQL_SMT VARCHAR2(32767);

V_TN VARCHAR2(40);

V_CN VARCHAR2(40);

V_CI PLS_INTEGER;

V_COLUMN_NAME VARCHAR2(40);

V_ETL_COLS VARCHAR2(32767);

V_LINE VARCHAR2(4000);

V_TBN VARCHAR2(40);

BEGIN

V_LOAD_FILE := UTL_FILE.FOPEN(V_ETL_DIR, 'load_data.sql', OPEN_MODE => 'w', MAX_LINESIZE => 32767);

FOR T_IX IN V_TABS.FIRST .. V_TABS.LAST

LOOP

V_SQL_SMT := 'select tn,cn,column_name,ci from ( select * from mysql_etl_tbs where tn='':tbn:'' ) l left join user_tab_columns r on l.tn = r.table_name and l.cn= r.column_name order by ci';

V_TBN := V_TABS(T_IX).TBN;

V_SQL_SMT := REPLACE(V_SQL_SMT, ':tbn:', V_TBN);

V_ETL_COLS := NULL;

OPEN V_CUR_MATCH FOR V_SQL_SMT;

LOOP

FETCH V_CUR_MATCH

INTO V_TN, V_CN, V_COLUMN_NAME, V_CI;

EXIT WHEN V_CUR_MATCH%NOTFOUND;

IF V_CI > 1

THEN

V_ETL_COLS := V_ETL_COLS || ' , ';

END IF;

IF V_COLUMN_NAME IS NULL

THEN

V_ETL_COLS := V_ETL_COLS || ' cast(null as number) ' || V_CN;

ELSE

V_ETL_COLS := V_ETL_COLS || V_CN;

END IF;

END LOOP;

CLOSE V_CUR_MATCH;

V_TBN := LOWER(V_TBN);

V_SQL_SMT := 'select ' || V_ETL_COLS || ' from ' || V_TBN || V_TABS(T_IX).WHR;

ETL_DATA(V_SQL_SMT, P_DATA_PATH, V_TBN);

END LOOP;

IF UTL_FILE.IS_OPEN(V_LOAD_FILE)

THEN

UTL_FILE.FCLOSE(V_LOAD_FILE);

END IF;

END;

END P_ETL_ORA_DATA;

总结

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