How to call Oracle function or stored procedure using spring persistence framework? - spring

Question

I am using Spring persistence framework for my project.
I want to call oracle function or stored procedure from this framework.
Can anybody suggest how can I achieve this.
Please give solution for both * oracle function and *stored procedure.
Thanks.

Answer 1

Assuming you are referring to JdbcTemplate:
jdbcTemplate.execute(
new CallableStatementCreator() {
public CallableStatement createCallableStatement(Connection con) throws SQLException{
CallableStatement cs = con.prepareCall("{call MY_STORED_PROCEDURE(?, ?, ?)}");
cs.setInt(1, ...); // first argument
cs.setInt(2, ...); // second argument
cs.setInt(3, ...); // third argument
return cs;
}
},
new CallableStatementCallback() {
public Object doInCallableStatement(CallableStatement cs) throws SQLException{
cs.execute();
return null; // Whatever is returned here is returned from the jdbcTemplate.execute method
}
}
);
Calling a function is almost identical:
jdbcTemplate.execute(
new CallableStatementCreator() {
public CallableStatement createCallableStatement(Connection con) {
CallableStatement cs = con.prepareCall("{? = call MY_FUNCTION(?, ?, ?)}");
cs.registerOutParameter(1, Types.INTEGER); // or whatever type your function returns.
// Set your arguments
cs.setInt(2, ...); // first argument
cs.setInt(3, ...); // second argument
cs.setInt(4, ...); // third argument
return cs;
}
},
new CallableStatementCallback {
public Object doInCallableStatement(CallableStatement cs) {
cs.execute();
int result = cs.getInt(1);
return result; // Whatever is returned here is returned from the jdbcTemplate.execute method
}
}
);

Answer 2

Simpler way of calling a Oracle function in Spring is subclassing StoredProcedure like below
public class MyStoredProcedure extends StoredProcedure{
private static final String SQL = "package.function";
public MyStoredProcedure(DataSource ds){
super(ds,SQL);
declareParameter(new SqlOutParameter("param_out",Types.NUMERIC));
declareParameter(new SqlParameter("param_in",Types.NUMERIC));
setFunction(true);//you must set this as it distinguishes it from a sproc
compile();
}
public String execute(Long rdsId){
Map in = new HashMap();
in.put("param_in",rdsId);
Map out = execute(in);
if(!out.isEmpty())
return out.get("param_out").toString();
else
return null;
}
}
And call it like this
#Autowired DataSource ds;
MyStoredProcedure sp = new MyStoredProcedure(ds);
String i = sp.execute(1l);
The Oracle function used here just takes in a numeric parameter and returns a numeric paramter.

Answer 3

In my opinion this is one of the easiest approaches:
public class ServRepository {
private JdbcTemplate jdbcTemplate;
private SimpleJdbcCall functionGetServerErrors;
#Autowired
public void setDataSource(DataSource dataSource) {
this.jdbcTemplate = new JdbcTemplate(dataSource);
JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
jdbcTemplate.setResultsMapCaseInsensitive(true);
this.functionGetServerErrors = new SimpleJdbcCall(jdbcTemplate).withFunctionName("THIS_IS_YOUR_DB_FUNCTION_NAME").withSchemaName("OPTIONAL_SCHEMA_NAME");
}
public String callYourFunction(int parameterOne, int parameterTwo) {
SqlParameterSource in = new MapSqlParameterSource().addValue("DB_FUNCTION_INCOMING_PARAMETER_ONE", parameterOne).addValue("DB_FUNCTION_INCOMING_PARAMETER_TWO", parameterTwo);
return functionGetServerErrors.executeFunction(String.class, in);
}
}

Answer 4

Calling function using NamedParameterJdbcTemplate:
final String query = "select MY_FUNCTION(:arg1, :arg2, :arg3) from dual";
Map<String, Object> argMap = new HashMap<>();
argMap.put("arg1", "value1");
argMap.put("arg2", 2);
argMap.put("arg3", "value3");
final String result = new NamedParameterJdbcTemplate(dataSource)
.queryForObject(query, argMap, String.class);
Calling procedure using JdbcTemplate:
final String query = "call MY_PROCEDURE(?, ?, ?)";
final Object[] args = {"arg1", "arg2", "arg3"};
new JdbcTemplate(dataSource).execute(query, args, String.class);
Calling function using SimpleJdbcCall:
Map<String, Object> inParameters = new HashMap<>();
inParameters.put("arg1", 55); // arg1 value
inParameters.put("arg2", 20); // arg2 value
MapSqlParameterSource mapSqlParameterSource = new MapSqlParameterSource(inParameters);
BigDecimal result = new SimpleJdbcCall(dataSource)
.withCatalogName("MY_PACKAGE")
.withSchemaName("MY_SCHEMA")
.withFunctionName("MY_FUNCTION")
.executeFunction(BigDecimal.class, mapSqlParameterSource);
Calling procedure using SimpleJdbcCall:
new SimpleJdbcCall(dataSource)
.withCatalogName("MY_PACKAGE")
.withProcedureName("MY_PROCEDURE")
.execute("arg1", arg2);