Obtaining a SqlRowSet from SimpleJdbcCall

0
42

This describes how to directly obtain a SqlRowSet using SimpleJdbcCall with a stored procedure in your database that has a cursor output parameter,

I am working with an Oracle database, I’ve attempted to create an example that should work for other databases, my Oracle example details issues with Oracle.

SimpleJdbcCall creation

Typically, you will want to create your SimpleJdbcCalls in a Service.

This example assumes your procedure has a single output parameter that is a cursor; you will need to adjust your declareParameters to match your procedure.

@Service

public class MyService() {

@Autowired

private DataSource dataSource;

// Autowire your configuration, for example @Value("${db.procedure.schema}") 
String schema;

private SimpleJdbcCall myProcCall;

// create SimpleJdbcCall after properties are configured

@PostConstruct

void initialize() {

this.myProcCall = new SimpleJdbcCall(dataSource)

.withProcedureName("my_procedure_name") .withCatalogName("my_package") 
.withSchemaName(schema)

.declareParameters(new SqlOutParameter( 
          "out_param_name",

Types.REF_CURSOR,

new SqlRowSetResultSetExtractor()));

}

public SqlRowSet myProc() {

Map<String, Object> out = this.myProcCall.execute(); 
          return (SqlRowSet) out.get("out_param_name"); 
 }

}

There are many options you can use here:

  • withoutProcedureColumnMetaDataAccess() needed if you have overloaded procedure names or just don’t want SimpleJdbcCall to validate against the database.
  • withReturnValue() if procedure has a return value. First value given to declareParameters defines the return value. Also, if your procedure is a function, use withFunctionName and executeFunction when executing.
  • withNamedBinding() if you want to give arguments using names instead of position.
  • useInParameterNames() defines the argument order. I think this may be required if you pass in your arguments as a list instead of a map of argument name to value. Though it may only be required if you use withoutProcedureColumnMetaDataAccess()

Oracle Databases

Here’s how to resolve issues with Oracle.

Assuming your procedure output parameter is ref cursor, you will get this exception.

java.sql.SQLException: Invalid column type: 2012

So change Types.REF_CURSOR to OracleTypes.CURSOR in SimpleJdbcCall.declareParameters()

Supporting OracleTypes

You may only need to do this if you have certain column types in your data.

The next issue I encountered was that proprietary Types such as oracle.sql.TIMESTAMPTZ caused this error in SqlRowSetResultSetExtractor:

Invalid SQL type for column; nested exception is java.sql.SQLException: Invalid SQL type for column

So we need to create a ResultSetExtractor that supports Oracle types.

I will explain the reason for the password after this code.

package com.boost.oracle;

import oracle.jdbc.rowset.OracleCachedRowSet;

import org.springframework.dao.DataAccessException;

import org.springframework.jdbc.core.ResultSetExtractor;

import org.springframework.jdbc.support.rowset.ResultSetWrappingSqlRowSet; import org.springframework.jdbc.support.rowset.SqlRowSet;

import java.sql.ResultSet;

import java.sql.SQLException;



/**

* OracleTypes can cause {@link org.springframework.jdbc.core.SqlRowSetResultSetExtractor}

* to fail due to a Oracle SQL type that is not in the standard {@link java.sql.Types}.

*

* Also, types such as {@link oracle.sql.TIMESTAMPTZ} require a Connection when processing

* the ResultSet; {@link OracleCachedRowSet#getConnectionInternal()} requires a JNDI

* DataSource name or the username and password to be set.

*

* For now I decided to just set the password since changing SpringBoot to a JNDI DataSource

* configuration is a bit complicated.

*

* Created by Arlo White on 2/23/17.

*/

public class OracleSqlRowSetResultSetExtractor implements ResultSetExtractor<SqlRowSet> {



private String oraclePassword;

public OracleSqlRowSetResultSetExtractor(String oraclePassword) {

this.oraclePassword = oraclePassword; 
}



@Override

public SqlRowSet extractData(ResultSet rs) throws SQLException, DataAccessException { 
          OracleCachedRowSet cachedRowSet = new OracleCachedRowSet();

// allows getConnectionInternal to get a Connection for TIMESTAMPTZ cachedRowSet.setPassword(oraclePassword);

cachedRowSet.populate(rs);

return new ResultSetWrappingSqlRowSet(cachedRowSet); 
}



}

Certain Oracle types require a Connection to obtain the column value from a ResultSet. TIMESTAMPTZ is one of these types. So when rowSet.getTimestamp(colIndex) is called, you will get this exception:

Caused by: java.sql.SQLException: One or more of the authenticating RowSet properties not set at oracle.jdbc.rowset.OracleCachedRowSet.getConnectionInternal(OracleCachedRowSet.java:560) at oracle.jdbc.rowset.OracleCachedRowSet.getTimestamp(OracleCachedRowSet.java:3717) at
org.springframework.jdbc.support.rowset.ResultSetWrappingSqlRowSet.getTimestamp

If you dig into this code, you will see that the OracleCachedRowSet needs the password or a JNDI DataSource name to get a Connection. If you prefer the JNDI lookup, just verify that OracleCachedRowSet has DataSourceName set.

So in my Service, I Autowire in the password and declare the output parameter like this:

new SqlOutParameter("cursor_param_name", OracleTypes.CURSOR, new OracleSqlRowSetResultSetExtractor(oraclePassword))

 

<< Spring Expression Language (SpEL)

Share your thoughts

Loading Facebook Comments ...
Loading Disqus Comments ...