I am using Spring 3.1.2,am using PreparedStatementSetter for Select, update and insert, but how can I use for Delete query?
jdbcTemplate.update() can be used for delete's
e.g.
JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
jdbcTemplate.update("delete from my_table where value=? ", new PreparedStatementSetter() {
public void setValues(PreparedStatement ps) throws SQLException {
ps.setLong(1, 2L);//or setString or whatever
}
});
you can also execute a delete without the PreparedStatementSetter as shown here: http://www.java2s.com/Code/Java/Spring/UseJdbcTemplateToExecuteDeleteStatementWithParameter.htm
You can use PreparedStatement for deletion like this
String sql = "DELETE FROM MY_TABLE WHERE ID = ?";
PreparedStatement ps = yourDBConnection.prepareStatement(sql);
ps.setInt(1, 1001);
// execute delete SQL stetement
ps.executeUpdate();
Related
This question already has answers here:
Import CSV into SQLite in Java
(2 answers)
Closed 2 years ago.
I am new to SQLite and I want to import data from an external file like csv into this embedded database rather than adding the data manually. For example in this case i added John McNeil and Paul Smith manually..is there a way to not add in manually by reading from a csv file with columns filled with first name and last name.
public class SQLiteTest {
private static Connection con;
private static boolean hasData = false;
private void getConnection() throws ClassNotFoundException, SQLException {
// sqlite driver
Class.forName("org.sqlite.JDBC");
// database path, if it's new database, it will be created in the project folder
con = DriverManager.getConnection("jdbc:sqlite:SQLiteTest1.db");
initialise();
}
public void addUser(String firstname, String lastname) throws ClassNotFoundException, SQLException {
if(con == null) {
// get connection
getConnection();
}
PreparedStatement prep = con
.prepareStatement("insert into user values(?,?,?);");
prep.setString(2, firstname);
prep.setString(3, lastname);
prep.execute();
}
public ResultSet displayUsers() throws SQLException, ClassNotFoundException {
if(con == null) {
// get connection
getConnection();
}
Statement state = con.createStatement();
ResultSet res = state.executeQuery("select fname, lname from user");
return res;
}
private void initialise() throws SQLException {
if( !hasData ) {
hasData = true;
// check for database table
Statement state = con.createStatement();
ResultSet res = state.executeQuery("SELECT name FROM sqlite_master WHERE type='table' AND name='user'");
if( !res.next()) {
System.out.println("Building the User table with prepopulated values.");
// need to build the table
Statement state2 = con.createStatement();
state2.executeUpdate("create table user(id integer,"
+ "fName varchar(60)," + "lname varchar(60)," + "primary key (id));");
// inserting some sample data
PreparedStatement prep = con.prepareStatement("insert into user values(?,?,?);");
prep.setString(2, "John");
prep.setString(3, "McNeil");
prep.execute();
PreparedStatement prep2 = con.prepareStatement("insert into user values(?,?,?);");
prep2.setString(2, "Paul");
prep2.setString(3, "Smith");
prep2.execute();
}
}
}
}
In enterprise applications, they use database migration tools like liquibase to do that.
It's well integrated with spring boot using auto configuration. but if you are not using spring you can configure it yourself.
You will have a XML file like that.
<?xml version="1.0" encoding="utf-8"?>
<databaseChangeLog
xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.6.xsd
http://www.liquibase.org/xml/ns/dbchangelog-ext
http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd">
<changeSet id="11111" author="me">
<loadData
file="data/users.csv"
separator=";"
tableName="user"/>
</changeSet>
</databaseChangeLog>
and you can have your data written in CSV file like that
id;login;first_name;last_name;email
1;John;John;John;John#localhost
I work with hibernate3 and didn't use JPA
I have a procedure in oracle which return 2 out parameter
For test I execute this procedure in oracle with this query.
declare
req_type number;
req_seq number;
begin
insert_req(1111,req_type,req_seq);
dbms_output.put_line('req_type='||req_type);
dbms_output.put_line('req_seq='||req_seq);
end;
Now I want to call this procedure using hibernate
I try with native query without success using this code :
public void insertReq(String numEmp) {
int req_type ;
int req_seq;
String sql = " insert_req(1111,:in1,:in2) ";
SQLQuery query = session.createSQLQuery(sql);
query.setParameter("in1", req_type);
query.setParameter("in2", req_seq);
List results = query.list();
System.out.println(req_type);
System.out.println(req_seq);
}
when I have a function I can run it using hibernate using this code as an example :
public void insertOrder(String numEmp) {
String query = "call insert_order(" + numEmp + ",50)";
SQLQuery sqlQuery = this.getSession().createSQLQuery(query);
sqlQuery.executeUpdate();
}
but the problem is how to call procedure with 2 out parameter using hibernate.
you have to use CallableStatement and registerOutParameter.
you can get a connection from your hibernate session and create the callablestatement.
hibernate does not provide a mecanism to deal with this (at least as i know).
i hope that helps.
Try this and let me know.
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
Session session = em.unwrap(Session.class);
session.doWork(new Work() {
#Override
public void execute(Connection con) throws SQLException {
// do something useful
try (CallableStatement stmt = con.prepareCall("{call my_sp()}")) {
stmt.execute();
}
}
});
em.close();
Best regards.
I have 200K rows to be inserted in one single database table. I tried to use jdbcTemplate.batchUpdate in spring in order to do insertion 10,000 per batch. However, this process consumes too much time (7 mins for 200K rows). So on database side, I check the number of rows inserted by select count(*) from table_X. I found the number of rows increased slightly instead of 10K expected. Can anyone explain what's reason or is it something which should be configurated on Database side ?
PS: I am using sybase ....
There are lot of approaches available on the web.
Performance directly depends on the
Code you have written
JDBC driver you are using
database server and number of connection you are using
table indexes leads to slowness for insertion
Without looking at your code anyone can guess, but no one can find the exact solution.
Approach 1
//insert batch example
public void insertBatch(final List<Customer> customers){
String sql = "INSERT INTO CUSTOMER " +
"(CUST_ID, NAME, AGE) VALUES (?, ?, ?)";
getJdbcTemplate().batchUpdate(sql, new BatchPreparedStatementSetter() {
#Override
public void setValues(PreparedStatement ps, int i) throws SQLException {
Customer customer = customers.get(i);
ps.setLong(1, customer.getCustId());
ps.setString(2, customer.getName());
ps.setInt(3, customer.getAge() );
}
#Override
public int getBatchSize() {
return customers.size();
}
});
}
reference
https://www.mkyong.com/spring/spring-jdbctemplate-batchupdate-example/
http://docs.spring.io/spring-framework/docs/3.0.0.M4/reference/html/ch12s04.html
Approach 2.1
//insert batch example
public void insertBatch(final List<Customer> customers){
String sql = "INSERT INTO CUSTOMER " +
"(CUST_ID, NAME, AGE) VALUES (?, ?, ?)";
List<Object[]> parameters = new ArrayList<Object[]>();
for (Customer cust : customers) {
parameters.add(new Object[] {cust.getCustId(),
cust.getName(), cust.getAge()}
);
}
getSimpleJdbcTemplate().batchUpdate(sql, parameters);
}
Alternatively, you can execute the SQL directly.
//insert batch example with SQL
public void insertBatchSQL(final String sql){
getJdbcTemplate().batchUpdate(new String[]{sql});
}
reference
https://www.mkyong.com/spring/spring-simplejdbctemplate-batchupdate-example/
Approach 2.2
public class JdbcActorDao implements ActorDao {
private SimpleJdbcTemplate simpleJdbcTemplate;
public void setDataSource(DataSource dataSource) {
this.simpleJdbcTemplate = new SimpleJdbcTemplate(dataSource);
}
public int[] batchUpdate(final List<Actor> actors) {
SqlParameterSource[] batch = SqlParameterSourceUtils.createBatch(actors.toArray());
int[] updateCounts = simpleJdbcTemplate.batchUpdate(
"update t_actor set first_name = :firstName, last_name = :lastName where id = :id",
batch);
return updateCounts;
}
// ... additional methods
}
Approach 2.3
public class JdbcActorDao implements ActorDao {
private SimpleJdbcTemplate simpleJdbcTemplate;
public void setDataSource(DataSource dataSource) {
this.simpleJdbcTemplate = new SimpleJdbcTemplate(dataSource);
}
public int[] batchUpdate(final List<Actor> actors) {
List<Object[]> batch = new ArrayList<Object[]>();
for (Actor actor : actors) {
Object[] values = new Object[] {
actor.getFirstName(),
actor.getLastName(),
actor.getId()};
batch.add(values);
}
int[] updateCounts = simpleJdbcTemplate.batchUpdate(
"update t_actor set first_name = ?, last_name = ? where id = ?",
batch);
return updateCounts;
}
// ... additional methods
}
Approach 3 :JDBC
dbConnection.setAutoCommit(false);//commit trasaction manually
String insertTableSQL = "INSERT INTO DBUSER"
+ "(USER_ID, USERNAME, CREATED_BY, CREATED_DATE) VALUES"
+ "(?,?,?,?)";
PreparedStatement = dbConnection.prepareStatement(insertTableSQL);
preparedStatement.setInt(1, 101);
preparedStatement.setString(2, "mkyong101");
preparedStatement.setString(3, "system");
preparedStatement.setTimestamp(4, getCurrentTimeStamp());
preparedStatement.addBatch();
preparedStatement.setInt(1, 102);
preparedStatement.setString(2, "mkyong102");
preparedStatement.setString(3, "system");
preparedStatement.setTimestamp(4, getCurrentTimeStamp());
preparedStatement.addBatch();
preparedStatement.executeBatch();
dbConnection.commit();
reference
https://www.mkyong.com/jdbc/jdbc-preparedstatement-example-batch-update/
/*Happy Coding*/
Try setting below for connection string - useServerPrepStmts=false&rewriteBatchedStatements=true. Have not tried but its from my bookmarks. You can search on these lines..
Connection c = DriverManager.getConnection("jdbc:<db>://host:<port>/db?useServerPrepStmts=false&rewriteBatchedStatements=true", "username", "password");
For us moving the code to a wrapper class and annotating the batch insert method with #Transactional did solve the problem.
Newbie programmer here. Upon doing mvn tomcat:run I get the following error:
SEVERE: Servlet.service() for servlet appServlet threw exception
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 'values (?, ?)' at line 1
The code in question is as follows:
public void create(User user) {
this.jdbcTemplate.update("INSERT INTO xyz.user(user_name, user_password values (?, ?)");
user.getUserName(); user.getId();
}
public void delete(User user) {
this.jdbcTemplate.update("DELETE FROM xyz.user WHERE id = ?");
}
public void update(User user) {
this.jdbcTemplate.update(
"UPDATE xyz.user SET UserName = ? password = ? WHERE id = ?");
Googled - couldn't find a solution for (?, ?) scenarios. Pls. help - Thx in advance :)
Here's the complete code (almost) - I am doing something wrong but can't figure out what.
public User find(String login) {
System.out.println("Trying to find the user...." + login);
User user = this.jdbcTemplate.queryForObject(
"select * from xyz where user_name = ?",
new Object[]{login},
new RowMapper<User>() {
public User mapRow(ResultSet rs, int rowNum) throws SQLException {
User user = new User();
user.setId(Long.valueOf(rs.getInt(1)));
user.setUserName(rs.getString(2));
user.setPassword(rs.getString(3));
return user;
}
});
System.out.println("Found user..." + user);
return user;
}
public void create(User user) {
this.jdbcTemplate.update("INSERT INTO ibstechc_dev.user(user_name, user_password) VALUES (?,?)");
user.getUserName(); user.getId() ;
}
public void delete(User user) {
this.jdbcTemplate.update("DELETE FROM xyz WHERE id = ?");
// TODO Auto-generated method stub
}
public void update(User user) {
this.jdbcTemplate.update(
"UPDATE xyz SET user_name = ?, user_password = ? WHERE id = ?");
// TODO Auto-generated method stub
}
}
I am stuck with the same error - tomcat:run throws the following -
SEVERE: Servlet.service() for servlet appServlet threw exception
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 '?,?)' at line 1
Use this code:
this.jdbcTemplate.update("INSERT INTO xyz.user(user_name, user_password) values (?, ?)");
There was an issue with your SQL statement. To give you perspective you were trying to do:
INSERT INTO xyz.user(user_name, user_password values ('testuser','testpass'))
instead of
INSERT INTO xyz.user(user_name, user_password) values ('testuser','testpass'))
Hope this makes sense?
I think here is the sql syntax problem:
INSERT INTO xyz.user(user_name, user_password values (?, ?)
replace this by
INSERT INTO xyz.user(user_name, user_password) values (?, ?);
There is a sql syntax error in update
public void update(User user) {
this.jdbcTemplate.update(
"UPDATE xyz.user SET UserName = ? password = ? WHERE id = ?");
this is not the way to update,give a comma(,) like this
public void update(User user) {
this.jdbcTemplate.update(
"UPDATE xyz.user SET UserName = ? ,password = ? WHERE id = ?");
your error is this statement
this.jdbcTemplate.update("INSERT INTO xyz.user(user_name, user_password values (?, ?)");
It should be
this.jdbcTemplate.update("INSERT INTO xyz.user(user_name, user_password) values (?, ?)");
Hope it helps
Cheers
Try this:-
this.jdbcTemplate.update("INSERT INTO xyz.user(user_name, user_password) values (?, ?)");
instead of
this.jdbcTemplate.update("INSERT INTO xyz.user(user_name, user_password values (?, ?)");
Is it possible to execute stored procedure using Spring JDBC API in batch mode?
I tried to use Spring JdbcTemplate's method batchUpdate and it doesn't work.
I use Spring 3.0 and Oracle JDBC driver version 11.2.0.3
JdbcTemplate template = new JdbcTemplate(dataSource);
template.batchUpdate("BEGIN SCHEMA.PERSON_UPDATE(I_N_PERSON_ID=> ? ,I_S_NAME=> ? ,J_N_TID=> ?);END;",
new BatchPreparedStatementSetter() {
public void setValues(PreparedStatement ps, int i) throws SQLException {
OracleCallableStatement cs = (OracleCallableStatement) ps;
cs.setString(1, persons.get(i).getName());
cs.setLong(2, persons.get(i).getPersonId());
cs.registerOutParameter(3, OracleTypes.NUMBER);
}
public int getBatchSize() {
return persons.size();
}}
);
Thanks
There is a mistake in implementation of the method setValues. You create instance of OracleCallableStatement but you have to register parameters in PreparedStatement which given in method argement like ps
JdbcTemplate template = new JdbcTemplate(dataSource);
template.batchUpdate("{call SCHEMA.PERSON_UPDATE(?, ?)}",
new BatchPreparedStatementSetter() {
public void setValues(PreparedStatement ps, int i) throws SQLException {
ps.setString(1, persons.get(i).getName());
ps.setLong(2, persons.get(i).getPersonId());
}
public int getBatchSize() {
return persons.size();
}
}
);
But there is a problem. PreparedStatement doesn't work with out parameters.