My table is :
Statement s5 = conn.createStatement();
ResultSet res5 = s5.executeQuery("Select name from sqlite_master where type = 'table' and name = 'actor_director'");
if(!res5.next()){
Statement ad = conn.createStatement();
ad.executeUpdate("create table actor_director(actor_ID integer, director_ID integer,"
+ "foreign key(actor_ID) references actor(actor_ID) ON UPDATE CASCADE ON DELETE CASCADE,"
+ "foreign key(director_ID) references director(director_ID)) ON UPDATE CASCADE ON DELETE CASCADE");
}
and i also did :
public static Connection getConnection() throws SQLException{
SQLiteConfig config = new SQLiteConfig();
config.enforceForeignKeys(true);
conn = DriverManager.getConnection("jdbc:sqlite:movieandtvseries.db", config.toProperties());
return conn;
}
When i run the program i get this error :
SQLiteException: [SQLITE_ERROR] SQL error or missing database (near "ON": syntax error)
You seem to have a typo in the line:
+ "foreign key(director_ID) references director(director_ID)) ON UPDATE CASCADE ON DELETE CASCADE");
There is an extra ')' after 'director_ID'. There is also a ')' missing after the last 'CASCADE' and before the double quote.
Related
I am trying to drop a foreign key constraint in a table but the SQL "DROP CONSTRAINT" Statement is not supported by ucanaccess. the error says:
java.lang.UnsupportedOperationException: DROP CONSTRAINT is only supported for Hibernate hbm2ddl.auto "create"
Does anybody know a way around this?
private void dropTables() throws SQLException {
final String RENTALS = "RENTALS";
Statement statement = conn.createStatement();
DatabaseMetaData metaData = conn.getMetaData();
ResultSet rs = metaData.getTables(null, null, RENTALS, null);
while (rs.next()) {
if (rs.getString(3).equals(RENTALS)) {
statement.executeUpdate("ALTER TABLE RENTALS DROP CONSTRAINT"
+ " custNumber;");
statement.executeUpdate("ALTER TABLE RENTALS DROP CONSTRAINT"
+ " vehNumber;");
statement.executeUpdate("DROP TABLE CUSTOMERS;");
statement.executeUpdate("DROP TABLE VEHICLE;");
statement.executeUpdate("DROP TABLE RENTALS;");
}
}
}
The error message implies that setting hbm2ddl.auto to create would solve the problem:
<entry key="hibernate.hbm2ddl.auto" value="create">
However, you might want to think twice before doing this, as this means that all the tables associated with your Hibernate entities will be created and dropped each time you start the application.
I want to create an auto_increment column in Hive.
I didn't see anything on the hive doc about that but I found that we can used :
UDFRowSequence to make that.
Is there the most recent way to do that or is there a new way, most "easier" ?
I already tried it : so in my Java project, I had created the function like that :
private static void createAutoIncrFunction() throws SQLException {
Statement stmt = conn.createStatement();
String sql = "create function autoincr as \"org.apache.hadoop.hive.contrib.udf.UDFRowSequence\"";
stmt.execute(sql);
}
The creation of the function is working.
But now I don't how to create my table with this function I tried :
private static void createTableLine() throws SQLException {
String sql = "CREATE TABLE IF NOT EXISTS line(id_line INT autoincr(), "
+ "uid_ticket VARCHAR(64), "
+ "number INT, "
+ "kind INT)";
Statement stmt = conn.createStatement();
stmt.execute(sql);
}
But It's not working, so my question is: how can I create a table with an auto_increment column and how can I insert data in it ?
The table is created normally. But while adding, you might use the function created by you.
hive> CREATE TABLE increment_table1 (id INT, c1 STRING, c2 STRING, c3 STRING);
hive> INSERT OVERWRITE TABLE increment_table1 SELECT incr() AS inc, id, c1, c2 FROM t1;
You can use this link for more information
This is my code for executing in my java program:
public static void createBooksTablesAndSetPK() {
String selectDB = "Use lib8";
String createBooksTable = "Create table IF NOT EXISTS books (ID int,Name varchar(20),ISBN varchar(10),Date date )";
String bookTablePK = "ALTER TABLE BOOKS ADD PRIMARY KEY(id)";
Statement st = null;
try (
Connection con = DriverManager.getConnection(dbUrl, "root", "2323");) {
st = con.createStatement();
st.execute(selectDB);
st.execute(createBooksTable);
st.execute(bookTablePK);
} catch (SQLException sqle) {
sqle.printStackTrace();
}
}
I cat use IF NOT EXIST for creating databasesand tables to prevent creating duplicate database and tables and corresponding errors.
But i don't know how prevent Multiple primary key error, because program may call createBooksTablesAndSetPK() multiple times.
Error:
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Multiple primary key defined
The column Book_id is not existing in your case. You are creating a table with ID as the column and then updating the table with a PRIMARY KEY constraint on a column that is not existing.
Create table IF NOT EXISTS books (ID int,Name varchar(20),ISBN varchar(10),Date date )
ALTER TABLE BOOKS ADD PRIMARY KEY(BOOK_id)
Try running these statements on a MySQL command prompt (or MySql Workbench) and the see the error.
You need change the alter table command like this.
ALTER TABLE BOOKS ADD BOOK_id VARCHAR( 255 ), ADD PRIMARY KEY(BOOK_id);
I am fairly new to MySQL with Java, but I have executed a few successful INSERT queries however cannot seem to get the CREATE TABLE query to execute without getting the MySQLSyntaxErrorException exception. My code is as follows:
Statement stmt;
String url = "jdbc:mysql://localhost:3306/mysql";
Connection con = DriverManager.getConnection(url, "root", "password");
stmt = con.createStatement();
String tblSQL = "CREATE TABLE IF NOT EXISTS \'dev\'.\'testTable\' (\n"
+ " \'id\' int(11) NOT NULL AUTO_INCREMENT,\n"
+ " \'date\' smallint(6) NOT NULL\n"
+ ") ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;";
stmt.executeUpdate(tblSQL);
stmt.close();
con.close();
And the error is as follows:
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 ''dev'.'testTable' (
'id' int(11) NOT NULL AUTO_INCREMENT,
'date' smallint(6) N' at line 1
I would appreciate it if anyone could spot the mistake in this query, as I've tried executing this within phpMyAdmin and it works as it should.
\n will make press enter effect :) make it like
String tblSQL = "CREATE TABLE IF NOT EXISTS `dev`.`testTable`"
+ "("
+ "id INTEGER(11) NOT NULL AUTO_INCREMENT primary key,"
+ "date smallint(6) NOT NULL"
+ ")"
+ "ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;";
I'm having problems with creating mySQL table within Java program. I constantly get Can't create table... errno: 150
Here is my code:
String URL="jdbc:mysql://192.168.1.128:3306";
Connection con=(Connection) DriverManager.getConnection(URL,user,pass);
Statement stmt=(Statement) con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
Statement stmt1=(Statement) con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
String mySQL_new_table=("CREATE TABLE IF NOT EXISTS dbtest.T_AJPES_TR " + "(" + "row_count INT PRIMARY KEY AUTO_INCREMENT,"
+ "rn CHAR(15),sSpre CHAR(5),reg CHAR(5),eno VARCHAR(10),davcna VARCHAR(15),Ime VARCHAR(75),Priimek VARCHAR(75),LOG_ID INT,INDEX L_ID (LOG_ID),FOREIGN KEY(LOG_ID) references T_AJPES_TR_LOG(ID_LOG) ON DELETE CASCADE ON UPDATE CASCADE) ENGINE = INNODB;");
String mySQL_log = ("CREATE TABLE IF NOT EXISTS dbtest.T_AJPES_TR_LOG" + "(ID_LOG INT PRIMARY KEY AUTO_INCREMENT, Date_import VARCHAR(45),File_import VARCHAR(75)) ENGINE = INNODB;");
stmt.executeUpdate(mySQL_new_table);
stmt1.executeUpdate(mySQL_log);
ResultSet uprs=stmt.executeQuery("SELECT * FROM dbtest.T_AJPES_TR");
ResultSet uprs1=stmt1.executeQuery("SELECT * FROM dbtest.T_AJPES_TR_LOG");
I googled many tutorials for creating foreign key and I still have problems. So what I'm doing wrong?
You've likely got an issue with foreign key constraints, see http://dev.mysql.com/doc/refman/5.1/en/innodb-foreign-key-constraints.html for more details.
First one to check is whether your LOG_ID reference to T_AJPES_TR_LOG(ID_LOG) is correct