在oracle数据库迁移至mysql数据库，除了oracle数据库模型移到mysql外，还一个重要环节就是要将oracle数据库的数据移到mysql数据库，本人尝试用过多款数据迁移程序，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，其具体过程如下：

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