Develop Reference

Why can't I set a variable in a prepared statement in MySQL?

I'm running a script to insert some data in a MySQL database, and it runs properly in the MySQL workbench. However, when I try to run it from Java via the JDBC, I get an error. The script is:
INSERT INTO `pa_record` (`username`, `pa_record_type`, `record_time`) VALUES (?, ?, CURRENT_TIMESTAMP);
SET #record_id := 1;
INSERT INTO `pa_crud` (`pa_record_id`, `table_name`) VALUES (#record_id, ?);
The error I get from the JDBC is
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SET #record_id := 1;
INSERT INTO pa_crud (pa_record_id, table_name) VALUES' at line 2
Any ideas?

Many (most?) database access libraries do not allow multiple statements in a single execute; those that do, usually need to have the feature activated with a setting change. It's likely not complaining about the SET, but that you had anything after the end of the first query at all.

How to create mysql stored procedure using jdbc

How can I create a stored procedure using JDBC? I've tried the following code, but it fails with errors.
Contents of the 'sql' variable which is used in jdbc code
CREATE PROCEDURE 'init'()
BEGIN
DECLARE '_rollback' BOOL DEFAULT 0;
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET '_rollback' = 1;
START TRANSACTION;
DROP TABLE IF EXISTS tst;
CREATE TABLE IF NOT EXISTS tst
(
did INT AUTO_INCREMENT PRIMARY KEY,
stage INT
);
INSERT INTO tst (stage) VALUES (11);
INSERT INTO tst (stage) VALUES (23);
IF '_rollback'
THEN
ROLLBACK;
ELSE
COMMIT;
END IF;
END;
JDBC Code:
Statement statement = connection.createStatement();
statement.executeLargeUpdate(sql);
JDBC Error:
java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''create_and_populate_schema'()
BEGIN
DECLARE '_rollback' BOOL DEFAULT 0;
' at line 1
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:536)
I hope DELIMITER should not be set because it only works inside 'mysql' client and it seems that there is no any alternative with sql-String that is supposed to be used with JDBC

com.microsoft.sqlserver.jdbc.SQLServerException: Incorrect syntax near '|'

There are two database connection in project.
1. oracle database
2. mssql database
Database connection is OK. Issue is when data transferred/inserted in one database[oracle] then it is display error and same time data inserted in another database[mssql] successfully.Insert query is fine but there is another query which is generate sequesnce number. There have problem.
This is the query which belongs to oracle database
return jdbcTemplate.queryForObject("SELECT 'AK'||LPAD(adds_seq.NEXTVAL,13, '0') adds_seq_no FROM sys.dual ",String.class);
Error is :
SELECT 'AK'||LPAD(adds_seq.NEXTVAL,13, '0') adds_seq_no FROM sys.dual ",String.class ]; nested exception is com.microsoft.sqlserver.jdbc.SQLServerException: Incorrect syntax near '|'.
at org.springframework.jdbc.support.SQLStateSQLExceptionTranslator.doTranslate(SQLStateSQLExceptionTranslator.java:98)
It is working well before when there is no mssql connection.
Below query is for oracle database. When I tried to change code like this:
String sql = " SELECT 'AK'||LPAD(adds_seq.NEXTVAL,13, '0') adds_seq_no FROM sys.dual";
String adSeqNum = null;
try {
adSeqNum = jdbcTemplate.queryForObject(sql, String.class);
} catch (Exception e) {
e.printStackTrace();
}
return addSeqNum;
then the error is
org.springframework.dao.DataIntegrityViolationException: PreparedStatementCallback; SQL []; ORA-01400: cannot insert NULL into ("ADDSS_HST"."ADDS_SEQ_NO")
1.Can you guide me how to solve this issue?
2.Can you please give me example for how to do separate database connection on one java file?

The "Incorrect syntax near '|'" happens because you are sending the Oracle statement "SELECT 'AK'||LPAD(adds_seq.NEXTVAL,13, '0') adds_seq_no FROM sys.dual " to the MSSQL server connection.
The second error, cannot insert null into "ADDSS_HST"."ADDS_SEQ_NO" I suspect happens because before the posted sql that selects from the sequence, you are inserting records into ADDSS_HST table. Is this correct? If so, I recommend that you put the code that generates adds_seq_no into a trigger like the one below (adjust names for your needs):
CREATE OR REPLACE TRIGGER "APPLICATION_BI_TRG"
BEFORE INSERT ON APPLICATION
REFERENCING NEW AS New OLD AS Old
FOR EACH ROW
BEGIN
if :new.application_id is null then
// if no value was given in insert statement for column application_id
SELECT APP_WEB_ID_SEQ.NEXTVAL INTO :NEW.application_id FROM dual;
// select a value from sequence into :NEW.application_id
end if;
END;
/

MySql connector j allow user variables

Please help me to find out how to allow mysql connector j to define user variables and make this code valid:
Statement s = conn.createStatement();
s.executeQuery ("set #categoryId := (Select CategoryId from categories order by CategoryId desc LIMIT 1);\n" +
"set #categoryId := IF(#categoryId is Null, 1, #categoryId);");
now it throws an exception:
MySQLSyntaxErrorException occured : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'set #categoryId := IF(#categoryId is Null, 1, #categoryId)' at line 2
I know that in .net you can define "Allow User Variables = true" option in connection string. How to do it in java?

I found out how to get it worked. Just set datasource property allowMultiQueries=true
jdbc:mysql://localhost:3306/DBS?allowMultiQueries=true

MyBatis java and MySql local variables

I'm new to java world. And I have a problem with simple query:
<insert id="create" parameterType="models.entities.CategoryEntity">
set #catId := (select categoryId from Categories limit 1);
insert into Categories(CategoryId, Title, LeftValue, RightValue)
values(#catId, 'Test in', 1,2);
....
</insert>
it simply fails when i trying to run it with mybatis:
PersistenceException occured : ### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'insert into Categories(CategoryId, Title, LeftValue, RightValue) values(' at line 2 ### The error may involve Category.create-Inline ### The error occurred while setting parameters ### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'insert into Categories(CategoryId, Title, LeftValue, RightValue) values(' at line 2
If I remove this line:
set #catId := (select categoryId from Categories limit 1);
then everything is ok. What am i doing wrong? Is it problem with jdbc or mybatis? How to use mysql #variables with mybatis? Does someone have examples of using MySql local variables with mybatis?

I found out how to get it worked. Just set datasource property allowMultiQueries=true
jdbc:mysql://localhost:3306/DBS?allowMultiQueries=true