I wonder if it is possible to get a key of a value after DuplicateKeyException in spring?
For example like this:
try {
KeyHolder keyHolder = new GeneratedKeyHolder();
getJdbcTemplate().update(
new PreparedStatementCreator() {
#Override
public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
PreparedStatement ps = con.prepareStatement(SQL, new String[]{"ID"});
ps.setString(1, user.getUSERNAME());
ps.setString(2, user.getEMAIL());
return ps;
}
},
keyHolder);
logger.info("Insert success");
return (BigDecimal) keyHolder.getKey();
} catch (DuplicateKeyException dke) {
logger.info("Insert failed");
// get key and do sth with it
return new BigDecimal(-1);
}
Any suggestions here are welcome.
I don't see an optimal solution for this problem. Try something like this:
Preselection - Select all counts of values. (if you have constraint for mail, check whether the mail exists or not. If you have another constraint for name, check whether the name exists or not. (SELECT COUNT(name) FROM table WHERE name='SOME_NAME') You can do this, before or after experiencing a DuplicateKeyException.
Extraction - Try to extract the column which causes problems from the Exception-Message (this is dirty). In this case, you don't have to execute multiple queries.
Related
I am executing multiple queries concurrently and retrieving the results. But, the queries belong to multiple tables so, when resultset is retrieved, it is difficult to identify that a resultset belong to which table.
Can anyone help here as to how to identify the table names for each query resultset?
I tried below code but table name is blank!!!!
public static void getColumnNames(ResultSet rs) throws SQLException {
if (rs == null) {
return;
}
// get result set meta data
ResultSetMetaData rsMetaData = rs.getMetaData();
int numberOfColumns = rsMetaData.getColumnCount();
// get the column names; column indexes start from 1
for (int i = 1; i < numberOfColumns + 1; i++) {
String columnName = rsMetaData.getColumnName(i);
// Get the name of the column's table name
String tableName = rsMetaData.getTableName(i);
System.out.println("column name=" + columnName + " table=" + tableName + "");
}
}
I am calling this method like this:
jdbcTemplate.query(sql, new ResultSetExtractor<ResultSet>() {
#Override
public ResultSet extractData(ResultSet resultSet) throws SQLException,
DataAccessException {
getColumnNames(resultSet);
return resultSet;
}
});
Please advise, what is done wrong here? :(
You're not doing anything wrong here. The problem is caused by the method itself in connection with your DBMS or your JDBC driver, respectively.
See this doc please. 'table name or "" if not applicable' suggests that in your case the DBMS/driver does not provide the required information, causing the method to return an empty string.
I'm afraid, you'll have to find another way to detect which query the result originated from.
I'm trying to insert some data to Cassandra with Astyanax, by I'm getting a lot of "Re-preparing already prepared query" warnings even if have caching enabled:
22:08:03,703 WARN Cluster:1702 - Re-preparing already prepared query INSERT INTO test.test (key,c0,c1,c2,c3,c4,c5,c6,c7,c8,c9) VALUES (?,?,?,?,?,?,?,?,?,?,?) . Please note that preparing the same query more than once is generally an anti-pattern and will likely affect performance. Consider preparing the statement only once.
22:08:03,707 WARN Cluster:1702 - Re-preparing already prepared query INSERT INTO test.test (key,c0,c1,c2,c3,c4,c5,c6,c7,c8,c9) VALUES (?,?,?,?,?,?,?,?,?,?,?) . Please note that preparing the same query more than once is generally an anti-pattern and will likely affect performance. Consider preparing the statement only once.
22:08:03,708 WARN Cluster:1702 - Re-preparing already prepared query INSERT INTO test.test (key,c0,c1,c2,c3,c4,c5,c6,c7,c8,c9) VALUES (?,?,?,?,?,?,?,?,?,?,?) . Please note that preparing the same query more than once is generally an anti-pattern and will likely affect performance. Consider preparing the statement only once.
Source code:
Connect: (executed once)
#Override
public void connect() throws ClientException {
AstyanaxContext<Keyspace> context = new AstyanaxContext.Builder()
.forCluster(clusterName)
.forKeyspace(keyspaceName)
.withHostSupplier(new Supplier<List<Host>>() {
#Override
public List<Host> get() {
return Collections.singletonList(new Host(host, 9160));
}
})
.withAstyanaxConfiguration(
new AstyanaxConfigurationImpl().setDiscoveryType(NodeDiscoveryType.DISCOVERY_SERVICE)
.setDiscoveryDelayInSeconds(60000))
.withConnectionPoolConfiguration(new JavaDriverConfigBuilder().build())
.buildKeyspace(CqlFamilyFactory.getInstance());
context.start();
keyspace = context.getClient();
columnFamilyTemplate = new ColumnFamily<String, String>(columnFamily,
StringSerializer.get(), StringSerializer.get());
try {
columnFamilyTemplate.describe(keyspace);
} catch (ConnectionException e) {
throw new ClientException(e);
}
insert = keyspace.prepareMutationBatch().withCaching(true);
}
Insert: (executed multiple times)
insert.discardMutations();
final ColumnListMutation<String> row = insert.withRow(columnFamilyTemplate, key);
for (Map.Entry<String, String> pair : columnValues.entrySet()) {
final String column = pair.getKey();
final String value = pair.getValue();
row.putColumn(column, value, null);
}
try {
insert.withCaching(true).execute();
} catch (ConnectionException e) {
throw new ClientException(e);
}
The warning message suggests that the caching is not actually working. Any idea how to fix it?
Note: I'm specifically not using Fluent NHibernate but am using 3.x's built-in mapping style. However, I am getting a blank recordset when I think I should be getting records returned.
I'm sure I'm doing something wrong and it's driving me up a wall. :)
Background / Setup
I have an Oracle 11g database for a product by IBM called Maximo
This product has a table called workorder which lists workorders; that table has a field called "wonum" which represents a unique work order number.
I have a "reporting" user which can access the table via the maximo schema
e.g. "select * from maximo.workorder"
I am using Oracle's Managed ODP.NET DLL to accomplish data tasks, and using it for the first time.
Things I've Tried
I created a basic console application to test this
I added the OracleManagedClientDriver.cs from the NHibernate.Driver on the master branch (it is not officially in the release I'm using).
I created a POCO called WorkorderBriefBrief, which only has a WorkorderNumber field.
I created a class map, WorkorderBriefBriefMap, which maps only that value as a read-only value.
I created a console application with console output to attempt to write the lines of work orders.
The session and transaction appear to open correct,
I tested a standard ODP.NET OracleConnection to my connection string
The Code
POCO: WorkorderBriefBrief.cs
namespace PEApps.Model.WorkorderQuery
{
public class WorkorderBriefBrief
{
public virtual string WorkorderNumber { get; set; }
}
}
Mapping: WorkorderBriefBriefMap.cs
using NHibernate.Mapping.ByCode;
using NHibernate.Mapping.ByCode.Conformist;
using PEApps.Model.WorkorderQuery;
namespace ConsoleTests
{
public class WorkorderBriefBriefMap : ClassMapping<WorkorderBriefBrief>
{
public WorkorderBriefBriefMap()
{
Schema("MAXIMO");
Table("WORKORDER");
Property(x=>x.WorkorderNumber, m =>
{
m.Access(Accessor.ReadOnly);
m.Column("WONUM");
});
}
}
}
Putting it Together: Program.cs
namespace ConsoleTests
{
class Program
{
static void Main(string[] args)
{
NHibernateProfiler.Initialize();
try
{
var cfg = new Configuration();
cfg
.DataBaseIntegration(db =>
{
db.ConnectionString = "[Redacted]";
db.Dialect<Oracle10gDialect>();
db.Driver<OracleManagedDataClientDriver>();
db.KeywordsAutoImport = Hbm2DDLKeyWords.AutoQuote;
db.BatchSize = 500;
db.LogSqlInConsole = true;
})
.AddAssembly(typeof(WorkorderBriefBriefMap).Assembly)
.SessionFactory().GenerateStatistics();
var factory = cfg.BuildSessionFactory();
List<WorkorderBriefBrief> query;
using (var session = factory.OpenSession())
{
Console.WriteLine("session opened");
Console.ReadLine();
using (var transaction = session.BeginTransaction())
{
Console.WriteLine("transaction opened");
Console.ReadLine();
query =
(from workorderbriefbrief in session.Query<WorkorderBriefBrief>() select workorderbriefbrief)
.ToList();
transaction.Commit();
Console.WriteLine("Transaction Committed");
}
}
Console.WriteLine("result length is {0}", query.Count);
Console.WriteLine("about to write WOs");
foreach (WorkorderBriefBrief wo in query)
{
Console.WriteLine("{0}", wo.WorkorderNumber);
}
Console.WriteLine("DONE!");
Console.ReadLine();
// Test a standard connection below
string constr = "[Redacted]";
OracleConnection con = new OracleConnection(constr);
con.Open();
Console.WriteLine("Connected to Oracle Database {0}, {1}", con.ServerVersion, con.DatabaseName.ToString());
con.Dispose();
Console.WriteLine("Press RETURN to exit.");
Console.ReadLine();
}
catch (Exception ex)
{
Console.WriteLine("Error : {0}", ex);
Console.ReadLine();
}
}
}
}
Thanks in advance for any help you can give!
Update
The following code (standard ADO.NET with OracleDataReader) works fine, returning the 16 workorder numbers that it should. To me, this points to my use of NHibernate more than the Oracle Managed ODP.NET. So I'm hoping it's just something stupid that I did above in the mapping or configuration.
// Test a standard connection below
string constr = "[Redacted]";
OracleConnection con = new Oracle.ManagedDataAccess.Client.OracleConnection(constr);
con.Open();
Console.WriteLine("Connected to Oracle Database {0}, {1}", con.ServerVersion, con.DatabaseName);
var cmd = new OracleCommand();
cmd.Connection = con;
cmd.CommandText = "select wonum from maximo.workorder where upper(reportedby) = 'MAXADMIN'";
cmd.CommandType = CommandType.Text;
Oracle.ManagedDataAccess.Client.OracleDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
Console.WriteLine(reader.GetString(0));
}
con.Dispose();
When configuring NHibernate, you need to tell it about your mappings.
I found the answer -- thanks to Oskar's initial suggestion, I realized it wasn't just that I hadn't added the assembly, I also needed to create a new mapper.
to do this, I added the following code to the configuration before building my session factory:
var mapper = new ModelMapper();
//define mappingType(s) -- could be an array; in my case it was just 1
var mappingType = typeof (WorkorderBriefBriefMap);
//use AddMappings instead if you're mapping an array
mapper.AddMapping(mappingType);
//add the compiled results of the mapper to the configuration
cfg.AddMapping(mapper.CompileMappingForAllExplicitlyAddedEntities());
var factory = cfg.BuildSessionFactory();
I've made a utility method to get schema from a db table. In this case Oracle 11 db.
public static DataTable GetColumnsSchemaTable(DbConnection cnctn, string tableName)
{
DataTable schemaTable;
string[] restrictions = new string[3] { null, tableName, null };
schemaTable = cnctn.GetSchema("Columns", restrictions);
/* table name is case sensitive and in XXXX db table names are UPPER */
if (schemaTable.Rows.Count == 0)
{
restrictions = new string[3] { null, tableName.ToUpper(), null };
schemaTable = cnctn.GetSchema("Columns", restrictions);
}
return schemaTable;
}
This works fine when the cnctn is created with System.Data.OracleClient provider factory. When it's created with System.Data.OleDb provider factory the table has no rows. I have an other utility method to get connection strings:
public static string GetDbConnectionString(DbConnection cnnctn, string provider, string server, string dbName, string user, string pwd)
{
if (cnnctn is OleDbConnection)
{
string usedProvider;
if (provider == null)
usedProvider = "msdaora";
else
usedProvider = provider;
return string.Format("Provider={0};Data Source={1};User Id={2};Password={3};",
usedProvider, dbName, user, pwd);
}
else if (cnnctn is System.Data.OracleClient.OracleConnection)
{
return string.Format("Data Source={0};User Id={1};Password={2};",
dbName, user, pwd);
}
else if (cnnctn is Oracle.DataAccess.Client.OracleConnection)
{
return string.Format("Data Source={0};User Id={1};Password={2};",
dbName, user, pwd);
}
else if (cnnctn is SqlConnection)
{
return string.Format("Data Source={0}; Initial Catalog={1}; User Id={2}; Password={3};",
server, dbName, user, pwd);
}
return string.Empty;
}
and the db connection works (i'm deleting rows before trying to get schema). All help will be appreciated.
Thanks & Best Regards - Matti
Ok. I sorted it out. I made this code long time ago only for now deprecated OracleClient and left the possibility to use other connections / provider factories. I didn't remember anymore that the restrictions vary from connection to connection. So the correct usage is:
string[] restrictions = new string[4] { null, null, tableName, null };
for OleDbConnection.
This query is returning the record with Min Create time Stamp for the Person Pers_ID when I run it in SQL Developer and the same query is not returning any value from Java JDBC connection.
Can you please help?
select PERS_ID,CODE,BEG_DTE
from PRD_HIST H
where PERS_ID='12345'
and CODE='ABC'
and CRTE_TSTP=(
select MIN(CRTE_TSTP)
from PRD_HIST S
where H.PERS_ID=S.PERS_ID
and PERS_ID='12345'
and EFCT_END_DTE is null
)
Java Code
public static List<String[]> getPersonwithMinCreateTSTP(final String PERS_ID,final String Category,final Connection connection){
final List<String[]> personRecords = new ArrayList<String[]>();
ResultSet resultSet = null;
Statement statement = null;
String PersID=null;
String ReportCode=null;
String effBegDate=null;
try{
statement = connection.createStatement();
final String query="select PERS_ID,CODE,EFCT_BEG_DTE from PRD_HIST H where PERS_ID='"+PERS_ID+"'and CODE='"+Category+"'and CRTE_TSTP=(select MIN(CRTE_TSTP) from PRD_HIST S where H.PERS_ID=S.PERS_ID and PERS_ID='"+PERS_ID+"' and EFCT_END_DTE is null)";
if (!statement.execute(query)) {
//print error
}
resultSet = statement.getResultSet();
while (resultSet.next()) {
PersID=resultSet.getString("PERS_ID");
ReportCode=resultSet.getString("CODE");
effBegDate=resultSet.getString("EFCT_BEG_DTE");
final String[] personDetails={PersID,ReportCode,effBegDate};
personRecords.add(personDetails);
}
} catch (SQLException sqle) {
CTLoggerUtil.logError(sqle.getMessage());
}finally{ // Finally is added to close the connection and resultset
try {
if (resultSet!=null) {
resultSet.close();
}if (statement!=null) {
statement.close();
}
} catch (SQLException e) {
//print error
}
}
return personRecords;
}
Print out your SQL SELECT statement from your java program and paste it into SQL*Plus and see what is happening. It's likely you're not getting your variables set to what you think you are. In fact, you're likely to see the error when you print out the SELECT statement without even running it - lower case values when upper is needed, etc.
If you still can't see it, post the actual query from your java code here.
I came here with similar problem - just thought I'd post my solution for others following - I hadn't run "COMMIT" after the inserts I'd made (via sqlplus) - doh!
The database table has records but the JDBC client can't retrieve the records.
Means the JDBC client doesn't have the select privileges. Please run the below query on command line:
grant all on emp to hr;