问题:
为一系列已经存在的表,添加一个相同的字段。(比如:添加SURVEYRESULT字段)
注:表名和字段名一定要大写,否则结果不正确
1、判断表是否在数据库中存在
'SELECT COUNT(*) FROM USER_OBJECTS WHERE OBJECT_NAME = UPPER (''' || V_TBL_NAME || ''')'
2、判断列是否在数据库中存在
‘SELECT COUNT(*) FROM USER_TAB_COLUMNS WHERE TABLE_NAME = UPPER('''||V_TBL_NAME || ''') AND COLUMN_NAME = ''SURVEYRESULT'''
- CREATE OR REPLACE PROCEDURE INSERTTABLESBYENTERPRISEID (
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ENTERPRISEID IN STRING
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)
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IS
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TYPE CURSOR_TEMP IS REF CURSOR;
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V_CURSOR CURSOR_TEMP;
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V_TBL_NAME VARCHAR2 (100) := '';
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V_SQL VARCHAR2 (500) := '';
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V_EXESQL VARCHAR2 (500) := '';
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V_EXITOBJ INTEGER := 0;
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BEGIN
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V_SQL :=
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'SELECT DISTINCT(RESULTTABLENAME) FROM SD_T_A01_'
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|| ENTERPRISEID
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|| ' WHERE ISDEL=0';
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OPEN V_CURSOR FOR V_SQL;
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LOOP
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FETCH V_CURSOR INTO V_TBL_NAME;
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EXIT WHEN V_CURSOR%NOTFOUND;
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IF (V_TBL_NAME IS NULL)
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THEN
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BEGIN
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V_TBL_NAME := 'SD_T_A07_' || ENTERPRISEID;
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END;
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END IF;
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V_EXESQL := 'SELECT COUNT(*) FROM USER_OBJECTS WHERE OBJECT_NAME = UPPER (''' || V_TBL_NAME || ''')';
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EXECUTE IMMEDIATE V_EXESQL INTO V_EXITOBJ;
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IF V_EXITOBJ > 0
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THEN
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NULL;
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V_EXITOBJ := 0;
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V_EXESQL := 'SELECT COUNT(*) FROM USER_TAB_COLUMNS WHERE TABLE_NAME = UPPER('''|| V_TBL_NAME || ''') AND COLUMN_NAME = ''SURVEYRESULT''';
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EXECUTE IMMEDIATE V_EXESQL INTO V_EXITOBJ;
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IF V_EXITOBJ > 0
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THEN
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V_SQL := 'ALTER TABLE '|| V_TBL_NAME|| ' ADD SurveyResult VARCHAR2(500)';
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EXECUTE IMMEDIATE V_SQL;
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END IF;
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END IF;
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END LOOP;
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COMMIT;
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END INSERTTABLESBYENTERPRISEID;
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