1. A table of contents in the content stored in each field, one record contains only the content of a field, represents Table B column_id field name, a field name for each record.
2. Tables A and B binding, the plurality of records into line A in the table storage, and into column_id of Table B field name.
3. The line data tables A and B was inserted into the temporary table 20 is inserted at every temporary table form.
| persion_id | content | unique_flag |
| 1 | Small | 123 |
| 1 | 22 | 123 |
| 1 | male | 123 |
| column_id | table_id |
| Full name | info |
| age | info |
| gender | info |
| persion_id | Full name | age | gender | unique_flag |
| 1 | Small | 22 | male | 123 |
Data obtained in the form of the above requirements, according to FIG. 1, FIG. 2 FIG. 3 to obtain table information.
Solutions:
1. Define variable from the required assignment in a database table to a variable field, and cyclic operation, the number of fields per insert, and the like.
- definition of variables
the DECLARE INSERT SQL VARCHAR (10000) the CHARACTER the SET UTF8;
the DECLARE valueSql VARCHAR (40000) the CHARACTER the SET UTF8;
the DECLARE the INT DONE the DEFAULT 0; - determining whether the cursor cycle is completed
the DECLARE the INT In Flag the DEFAULT 0;
the DECLARE patient_id1 VARCHAR (80) the CHARACTER the SET UTF8;
the DECLARE column_id1 VARCHAR (4000) the CHARACTER the SET UTF8 the DEFAULT 0;
the DECLARE content1 VARCHAR (4000) the CHARACTER the SET UTF8;
the DECLARE unique_flag2 VARCHAR (40) the CHARACTER the SET UTF8 the DEFAULT. 1;
the DECLARE unique_flag1 VARCHAR (40) the CHARACTER the SET UTF8;
the DECLARE J VARCHAR (40) DEFAULT 1; - number of fields in a record change, dynamic insertion vALUE variable names and values
DECLARE CNT VARCHAR (40) DEFAULT 0 ; - counter counts the number of records has been added
2. Define a cursor, the tables A and B are connected to obtain data to be processed.
DECLARE mycursor CURSOR FOR SELECT
a.patient_id,
b.table_id,
b.column_id,
a.content,
a.unique_flag
from qs_answer a
LEFT JOIN ques_columns_master b ON a.unique_key=b.answer_id
and a.question_id=b.question_id WHERE b.table_id='health' and a.delete_flag=0
ORDER BY a.unique_flag;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1;
3. variable initialization, initialization of insertSql and valueSql
SET insertSql=CONCAT('insert into healthtmp(patient_id,unique_flag,');
SET valueSql='VALUES';
4. Open the cursor, the cursor processing each read value, and the values passed to insertSql valueSql, and at every 20 counts and splice insertSql valueSql statement and executes sql statement.
- Open the cursor
the OPEN MyCursor;
param_loop: LOOP
the FETCH MyCursor the INTO patient_id1, table_id1, column_id1, content1, unique_flag1;
the IF DONE =. 1 THEN
the LEAVE param_loop;
the END the IF;
the SET In Flag =. 1;
the IF the CNT <= 20 is THEN
the IF THEN unique_flag2 = unique_flag1 // in different unique_flag to insert a record
IF j <12 THEN // every record there is a field 12 of storage columns, into the line memory required
SET insertSql = CONCAT (insertSql, column_id1 , ',');
the IF the END;
the IF THEN J = 12 is
the SET iNSERT SQL = CONCAT (iNSERT SQL, column_id1, ')'); // for each 20 iNSERT SQL insert statements requires only one insert field
The IF the END;
the IF THEN // content1 the IS NULL when content1 is empty, the result is null the concat connection, stored in the database needs to be treated as a field null value
the SET content1 = '';
the END the IF;
the IF MOD 12 is J = 0 THEN @ 12 is a value per content
the SET valueSql = CONCAT (valueSql, '' '', content1, '' '', '),');
the END the IF;
! 0 the IF THEN J = MOD 12 is
the SET valueSql = CONCAT (valueSql, '' '', content1, '' '', ',');
the END the IF;
the SET J = J +. 1;
the END the IF;
the IF unique_flag2!=unique_flag1 THEN
SET CNT=CNT+1;
THEN the CNT = 21 is the IF
the IF = In Flag. 1 THEN
the SET = valueSql the substring (valueSql,. 1, CHAR_LENGTH (valueSql) -1);
the SET @ SqlCmd1 = CONCAT (INSERT SQL, valueSql); // 20 when recording, stitching and INSERT SQL valueSql, performing SqlCmd1, inserts the result into the database
the PREPARE stmt the FROM @ SqlCmd1;
the eXECUTE stmt;
SET iNSERT SQL = CONCAT ( 'iNSERT iNTO healthtmp (patient_id, unique_flag,');
SET valueSql = CONCAT ( 'the VALUES');
the END the IF;
the SET the CNT . 1 =;
the SET. 1 = J;
END IF;
IF j<12 THEN
SET insertSql=CONCAT(insertSql,column_id1,',');
END IF;
IF j=12 THEN
SET insertSql=CONCAT(insertSql,column_id1,')');
END IF;
IF update_date1 IS NULL THEN
SET update_date1='';
END IF;
IF content1 IS NULL THEN
SET content1='';
END IF;
SET valueSql = CONCAT (valueSql, ' (' '', patient_id1, '' ',' '', unique_flag1, '' ',' '', content1, '' ','); // When the initial values of other fields assignment
the SET J = J +. 1;
the SET unique_flag2 = unique_flag1;
the END the IF;
the END the IF;
the END LOOP param_loop;
- inserting the last recording
the SET = valueSql the substring (valueSql,. 1, CHAR_LENGTH (valueSql) -1);
the IF = In Flag. 1 THEN
the SET @ SqlCmd1 = CONCAT (INSERT SQL, valueSql);
the PREPARE stmt the FROM @ SqlCmd1;
the EXECUTE stmt;
the END the IF;
Close MyCursor;
For inserted, after each value values need to add a comma, comma need to be removed when the last value, needs to be extracted out of the last value valueSql, because there are Chinese in the field, it is necessary to correctly use char_length interception interception.
