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抽取oracle数据到mysql数据库的实现过程

来源:建站教学网  时间:2019-07-30 10:31:15

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;

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