DROP TABLE IF EXISTS Pose ;
results in the error
Error code -1, SQL state 42X01: Syntax error: Encountered "EXISTS" at line 1, column 15.
I'm running this from inside NetBeans 7.3 using the default Derby sample db.
Derby does not currently support IF EXISTS
Are you trying to create a table? If yes, this is what you should do:
public void createTables() throws SQLException {
Statement statement = getConnection().createStatement();
System.out.println("Checking database for table");
DatabaseMetaData databaseMetadata = getConnection().getMetaData();
ResultSet resultSet = databaseMetadata.getTables(null, null, "PATIENT", null);
if (resultSet.next()) {
System.out.println("TABLE ALREADY EXISTS");
} else {
//language=MySQL
statement.execute("CREATE TABLE Patient (" +
"CardNumber CHAR(10) NOT NULL PRIMARY KEY, " +
" FirstName CHAR(50)," +
" MiddleName CHAR(50)," +
" LastName CHAR(50) )");
}
}
Remember to use all caps for the table name you pass into databaseMetadata.getTables(...)
The MySQL 6.0 syntax for declaring a table is this:
CREATE TABLE [IF NOT EXISTS] tableName ...
and the MySQL syntax for removing a table is this:
DROP TABLE [IF EXISTS] tableName ...
These clauses are MySQL extensions which are not part of the ANSI/ISO SQL Standard. This functionality may be peculiar to MySQL: I can't find anything similar documented for Derby, Postgres, Oracle, or DB2.
The best alternative I can find is to query the system tables to see if the table exists.
select count(*) from sys.systables where tablename = 'YOUR_TABLE_NAME'"
I had a similar issue dropping stored procedures. They can be queried using this statement.
select count(*) from sys.sysaliases where alias = 'YOUR_STORED_PROCEDURE_NAME'
If someone is looking to drop and create a table in an sql file that is Run with Spring test framework, Check https://stackoverflow.com/a/47459214/3584693 for an answer that ensures that no exception is thrown when drop table is invoked when said table doesn't exist.
Related
I can select(in Oracle) from postgers with dblink, and its work fine.
But if i create procedure with this select:
Procedure:
`CREATE OR REPLACE PROCEDURE test_merge as
begin
MERGE INTO CARDS C
USING (SELECT c."card_id", 1, n."channel"
FROM "table_1"#DBLINK_NAME n
JOIN
"table_2"#DBLINK_NAME c
ON n."card_id" = c."id"
WHERE n."type" = 'param1') B
ON (C.CARDID = B."card_id")
WHEN MATCHED
THEN
UPDATE SET C.SENDR = 1, C.PHONE = '+' || B."channel";
end;`
ORA-04052: error occurred when looking up remote object postgres.table_name#DBLINK_NAME ORA-00604: error occurred at recursive SQL level 1 ORA-28500: connection from ORACLE to a non-Oracle system return this message: ERROR: relation "postgres.card" does
Have any idea?
Oracle 11g
Thanks!
It was necessary to specify the owner of the database on postgre. In my case, it was enough to specify "public". in the procedure. before accessing tables.
"public"."table_1"#DBLINK_NAME
I'm trying to select object from dynamic tables but when I run my code I get some erros... There's a way for to do it... I'm using JPA, hibernate and postgres
#Query(nativeQuery = true,
value =
"SELECT u.* " +
"FROM " +
" ?1 AS u ")
Map<String, String> findAny(String tableName);
Here is the error...
org.springframework.dao.InvalidDataAccessResourceUsageException",
"debugMessage": "org.springframework.dao.InvalidDataAccessResourceUsageException: could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet\r\n\tat org.springframework.orm.jpa.vendor.HibernateJpaDialec
org.postgresql.util.PSQLException: ERROR: syntax error at or near "$1"
With Hibernate, you can't set table name as paramater, this is to ensure against security risks like SQL injection.
you have to mentions the table that you are getting the data from
value ="SELECT * FROM TableName u ?1")
I created a temporary table with sqlalchemy (with an underlying postgres database) that is going to be joined with a database table. However, in some cases when a value is empty '' then postgres throws the error:
failed to find conversion function from unknown to text
SqlAlchemy assembles everything to the following context
[SQL: 'WITH temp_table AS \n(SELECT %(param_1)s AS id, %(param_2)s AS email, %(param_3)s AS phone)\n SELECT campaigns_contact.id, campaigns_contact.email, campaigns_contact.phone \nFROM campaigns_contact JOIN temp_table ON temp_table.id = campaigns_contact.id AND temp_table.email = campaigns_contact.email AND temp_table.phone = campaigns_contact.phone'] [parameters: {'param_1': 83, 'param_2': '', 'param_3': '+1234567890'}]
I assemble the temporary table as follows
stmts = []
for row in import_data:
row_values = [literal(row[value]).label(value) for value in values]
stmts.append(select(row_values))
subquery = union_all(*stmts)
subquery = subquery.cte(name="temp_table")
The problem seems to be the part here
...%(param_2)s AS email...
which after replacing the param_2 results in
...'' AS email...
which will cause the error mentioned above.
One way to solve the issue is to perform a cast
...''::text AS email...
However, I don't know how to perform ::text cast with sqlalchemy!?
I searching for help. I have to map my Postgres 9.4 Database (DB) with Hibernate 5.2, of course it's an study task. The biggest Problem is, that I'm no brain in Hibernate, Java and coding itself XD
It's an SozialNetwork DB. To map the DB with Hibernate doing fine.
Now I should map a stored produce. This Produce should find the shortest friendship path between two persons. In Postgres the produce working fine.
That are the relevant DB-Tables:
For Person:
CREATE TABLE Person (
PID bigint NOT NULL,
firstName varchar(50) DEFAULT NULL,
lastName varchar(50) DEFAULT NULL,
(some more...)
PRIMARY KEY (PID)
);
And for the Relationship between to Persons:
CREATE TABLE Person_knows_Person (
ApID bigint NOT NULL,
BpID bigint REFERENCES Person (PID) (..)
knowsCreationDate timestamp,
PRIMARY KEY (ApID,BpID));
And that is the Stored Produce in short:
CREATE OR REPLACE FUNCTION ShortFriendshipPath(pid bigint, pid2 bigint)
RETURNS TABLE (a_pid bigint, b_pid bigint, depth integer, path2 bigint[], cycle2 boolean)
AS $$
BEGIN
RETURN QUERY
SELECT * FROM (
WITH RECURSIVE FriendshipPath(apid, bpid, depth, path, cycle) AS(
SELECT pkp.apid, pkp.bpid,1,
ARRAY[pkp.apid], false
FROM person_knows_person pkp
WHERE apid=$1 --OR bpid=$1
UNION ALL
SELECT pkp.apid, pkp.bpid, fp.depth+1, path || pkp.apid,
pkp.apid = ANY(path)
FROM person_knows_person pkp, FriendshipPath fp
WHERE pkp.apid = fp.bpid AND NOT cycle)
SELECT *
FROM FriendshipPath WHERE bpid=$2) AS OKOK
UNION
SELECT * FROM (
WITH RECURSIVE FriendshipPath(apid, bpid, depth, path, cycle) AS(
SELECT pkp.apid, pkp.bpid,1,
ARRAY[pkp.apid], false
FROM person_knows_person pkp
WHERE apid=$2 --OR bpid=$1
UNION ALL
SELECT pkp.apid, pkp.bpid, fp.depth+1, path || pkp.apid,
pkp.apid = ANY(path)
FROM person_knows_person pkp, FriendshipPath fp
WHERE pkp.apid = fp.bpid AND NOT cycle)
SELECT *
FROM FriendshipPath WHERE bpid=$1) AS YOLO
ORDER BY depth ASC LIMIT 1;
END;
$$ LANGUAGE 'plpgsql' ;
(Sorry for so much code, but it's for both directions, and before I post some copy+reduce misttakes^^)
The Call in Postgre for example:
SELECT * FROM ShortFriendshipPath(10995116277764, 94);
gives me this Output:
enter image description here
I use the internet for help and find 3 solutions for calling:
direct SQL call
call with NamedQuery and
map via XML
(fav found here)
I faild with all of them XD
I favorite the 1. solution with this call in session:
Session session = HibernateUtility.getSessionfactory().openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
System.out.println("Please insert a second PID:");
Scanner scanner = new Scanner(System.in);
long pid2 = Long.parseLong(scanner.nextLine());
// **Insert of second ID*/
Query query2 = session.createQuery("FROM " + Person.class.getName() + " WHERE pid = :pid ");
query2.setParameter("pid", pid2);
List<Person> listB = ((org.hibernate.Query) query2).list();
int cnt1 = 0;
while (cnt1 < listB.size()) {
Person pers1 = listB.get(cnt1++);
pid2 = pers1.getPid();
}
// Query call directly:
Query querySP = session.createSQLQuery("SELECT a_pid,path2 FROM ShortFriendshipPath(" + pid + "," + pid2 + ")");
List <Object[]> list = ((org.hibernate.Query) querySP).list();
for (int i=0; i<list.size();i++){
Personknowsperson friendship = (Personknowsperson)result.get(i);
}
} catch (Exception e) { (bla..)}
} finally { (bla....) }
Than I get following Error:
javax.persistence.PersistenceException:
org.hibernate.MappingException: No Dialect mapping for JDBC type: 2003
(..blabla...)
I understand why. Because my output is not of type Personknowsperson. I found an answer: that I have to say Hibernate what is the correct formate. And should use 'UserType'. So I try to find some explanations for how I create my UserType. But I found nothing, that I understand. Second Problem: I'm not sure what I should use for the bigint[] (path2). You see I'm expert -.-
Than I got the idea to try the 3.solution. But the first problem I had was where should I write the xml stuff. Because my Output is no table. So I try in the .cfg.xml but than Hibernate say that
Caused by: java.lang.IllegalArgumentException: org.hibernate.internal.util.config.ConfigurationException: Unable to perform unmarshalling at line number -1 and column -1 in RESOURCE hibernate.cfg.xml. Message: cvc-complex-type.2.4.a: Ungültiger Content wurde beginnend mit Element 'sql-query' gefunden. '{some links}' wird erwartet.
translation:
invalid content found starts with 'sql-query'
Now I'm a nervous wreck. And ask you.
Could someone explain what I have to do and what I did wrong (for dummies please). If more code need (java classes or something else) please tell me. Critic for coding also welcome, cause I want improve =)
Ok, I'm not an expert in postgressql, not hibernate, nor java. (I'm working with C#, SQL Server, NHibernate so ...) I still try to give you some hints.
You probably can set the types of the columns using addXyz methods:
Query querySP = session
.createSQLQuery("SELECT * FROM ShortFriendshipPath(...)")
.addScalar("a_pid", LongType.INSTANCE)
...
// add user type?
You need to create a user type for the array. I don't know how and if you can add it to the query. See this answer here.
You can also add the whole entity:
Query querySP = session
.createSQLQuery("SELECT * FROM ShortFriendshipPath(...)")
.addEntity(Personknowsperson.class)
...;
I hope it takes the mapping definition of the corresponding mapping file, where you can specify the user type.
Usually it's much easier to get a flat list of values, I mean a separate row for each different value in the array. Like this:
Instead of
1 | 2 | (3, 4, 5) | false
You would get:
1 | 2 | 3 | false
1 | 2 | 4 | false
1 | 2 | 5 | false
Which seems denormalized, but is actually the way how you build relational data.
In general: use parameters when passing stuff like ids to queries.
Query querySP = session
.createSQLQuery("SELECT * FROM ShortFriendshipPath(:pid1, :pid2)")
.setParameter("pid1", pid1)
.setParameter("pid2", pid2)
...
I have a database in Postgresql 9.0 and I'm trying to use Doctrine ORM 1.2 to generate models from db.
Here is my code:
<?php
require_once 'Doctrine.php';
spl_autoload_register(array('Doctrine', 'autoload'));
spl_autoload_register(array('Doctrine_Core', 'modelsAutoload'));
$manager = Doctrine_Manager::getInstance();
$conn = Doctrine_Manager::connection('pgsql://postgres:secret#192.168.1.108/erp','doctrine');
$conn->setAttribute( Doctrine_Core::ATTR_PORTABILITY, Doctrine_Core::PORTABILITY_FIX_CASE | PORTABILITY_RTM);
$conn->setAttribute( Doctrine_Core::ATTR_QUOTE_IDENTIFIER, true);
$manager->setAttribute(Doctrine_Core::ATTR_AUTO_ACCESSOR_OVERRIDE, true);
Doctrine_Core::loadModels('../application/models');
Doctrine_Core::generateModelsFromDb('../application/models', array('doctrine'), array('generateTableClasses' => true));
?>
and when I run the page, I get this error:
Fatal error: Uncaught exception 'Doctrine_Connection_Pgsql_Exception' with message 'SQLSTATE[42P01]: Undefined table: 7 ERROR: missing FROM-clause entry for table "t" LINE 6: ... t.typtype ... ^. Failing Query: "SELECT ordinal_position as attnum, column_name as field, udt_name as type, data_type as complete_type, t.typtype AS typtype, is_nullable as isnotnull, column_default as default, ( SELECT 't' in D:\Doctrine-1.2.3\Doctrine-1.2.3\Doctrine\Connection.php on line 1082
It's worth to mention, this code is working perfectly for mysql (by having mysql:// ... in the connection ofcurse), but having trouble to get it working with postgresql 9.0.
Any idea?
Sounds like this bug in Doctrine: http://www.doctrine-project.org/jira/browse/DC-919
Try to add quotes to table name, or column names.
Find right naming while exporting a table.
My problem was that someone added quotes to table name.
$sql='SELECT "id","name",
("f1"=\'aaa\' OR
"f1"=\'bbb\') AS "myflag"
FROM "mytable"';