用于调用存储过程的Spring JDBC模板

Question

使用现代(大约2012年)Spring JDBC模板调用存储过程的正确方法是什么？

说,我有一个存储过程声明了两个IN和OUT参数,如下所示:

mypkg.doSomething(
    id OUT int,
    name IN String,
    date IN Date
)

我遇到过CallableStatementCreator必须明确注册IN和OUT参数的基础方法.在JdbcTemplate课堂上考虑以下方法:

public Map<String, Object> call(CallableStatementCreator csc, List<SqlParameter> declaredParameters)

当然,我知道我可以像这样使用它:

List<SqlParameter> declaredParameters = new ArrayList<SqlParameter>();

declaredParameters.add(new SqlOutParameter("id", Types.INTEGER));
declaredParameters.add(new SqlParameter("name", Types.VARCHAR));
declaredParameters.add(new SqlParameter("date", Types.DATE));

this.jdbcTemplate.call(new CallableStatementCreator() {

    @Override
    CallableStatement createCallableStatement(Connection con) throws SQLException {
        CallableStatement stmnt = con.createCall("{mypkg.doSomething(?, ?, ?)}");

        stmnt.registerOutParameter("id", Types.INTEGER);
        stmnt.setString("name", "<name>");
        stmnt.setDate("date", <date>);

        return stmnt;
    }
}, declaredParameters);

declaredParameters当我在csc实施中注册时,目的是什么？换句话说,为什么我需要传递一个csc当春天可以简单地在con.prepareCall(sql)内部做什么？基本上,我不能通过他们中的任何一个而不是他们两个？

或者,有没有比我迄今为止遇到的更好的方法来调用存储过程(使用Spring JDBC Template)？

注意:您可能会发现许多看似具有相似标题的问题,但它们与此问题不同.

Answer 1

有许多方法可以在Spring中调用存储过程.

如果您使用CallableStatementCreator声明参数,您将使用Java的标准接口CallableStatement,即注册参数并单独设置它们.使用SqlParameter抽象将使您的代码更清晰.

我建议你看看SimpleJdbcCall.它可以像这样使用:

SimpleJdbcCall jdbcCall = new SimpleJdbcCall(jdbcTemplate)
    .withSchemaName(schema)
    .withCatalogName(package)
    .withProcedureName(procedure)();
...
jdbcCall.addDeclaredParameter(new SqlParameter(paramName, OracleTypes.NUMBER));
...
jdbcCall.execute(callParams);

对于简单的程序,您可以使用jdbcTemplate的update方法:

jdbcTemplate.update("call SOME_PROC (?, ?)", param1, param2);

Answer 2

以下是从java调用存储过程的方法

1.使用CallableStatement:

 connection = jdbcTemplate.getDataSource().getConnection();
  CallableStatement callableStatement = connection.prepareCall("{call STORED_PROCEDURE_NAME(?, ?, ?)}");
  callableStatement.setString(1, "FirstName");
  callableStatement.setString(2, " LastName");
  callableStatement.registerOutParameter(3, Types.VARCHAR);
  callableStatement.executeUpdate();

在这里,我们从外部管理资源关闭

2.使用CallableStatementCreator

 List paramList = new ArrayList();
    paramList.add(new SqlParameter(Types.VARCHAR));
    paramList.add(new SqlParameter(Types.VARCHAR));
    paramList.add(new SqlOutParameter("msg", Types.VARCHAR));

    Map<String, Object> resultMap = jdbcTemplate.call(new CallableStatementCreator() {

    @Override
    public CallableStatement createCallableStatement(Connection connection)
    throws SQLException {

    CallableStatement callableStatement = connection.prepareCall("{call STORED_PROCEDURE_NAME(?, ?, ?)}");
    callableStatement.setString(1, "FirstName");
            callableStatement.setString(2, " LastName");
            callableStatement.registerOutParameter(3, Types.VARCHAR);
    return callableStatement;

    }
    }, paramList);

3.使用SimpleJdbcCall:

SimpleJdbcCall simpleJdbcCall = new SimpleJdbcCall(jdbcTemplate)

.withProcedureName("STORED_PROCEDURE_NAME");

Map<String, Object> inParamMap = new HashMap<String, Object>();
inParamMap.put("firstName", "FirstNameValue");
inParamMap.put("lastName", "LastNameValue");
SqlParameterSource in = new MapSqlParameterSource(inParamMap);


Map<String, Object> simpleJdbcCallResult = simpleJdbcCall.execute(in);
System.out.println(simpleJdbcCallResult);

4.使用org.springframework.jdbc.object的StoredProcedure类

The Code:
First Create subclass of StoredProcedure: MyStoredProcedure

class MyStoredProcedure extends StoredProcedure {

public MyStoredProcedure(JdbcTemplate jdbcTemplate, String name) {

super(jdbcTemplate, name);
setFunction(false);

}

}

Use MyStoredProcedure to call database stored procedure:


//Pass jdbcTemlate and name of the stored Procedure.
MyStoredProcedure myStoredProcedure = new MyStoredProcedure(jdbcTemplate, "PROC_TEST");

//Sql parameter mapping
SqlParameter fNameParam = new SqlParameter("fName", Types.VARCHAR);
SqlParameter lNameParam = new SqlParameter("lName", Types.VARCHAR);
SqlOutParameter msgParam = new SqlOutParameter("msg", Types.VARCHAR);
SqlParameter[] paramArray = {fNameParam, lNameParam, msgParam};


myStoredProcedure.setParameters(paramArray);
myStoredProcedure.compile();


//Call stored procedure
Map storedProcResult = myStoredProcedure.execute("FirstNameValue", " LastNameValue");

参考

Answer 3

我通常更喜欢扩展基于Spring的StoredProcedure类来执行存储过程.

1. 您需要创建类构造函数,并需要在其中调用StoredProcedure类构造函数.这个超类构造函数接受DataSource和过程名称.

   示例代码:

   public class ProcedureExecutor extends StoredProcedure {
         public ProcedureExecutor(DataSource ds, String funcNameorSPName) {
           super(ds, funcNameorSPName);
           declareParameter(new SqlOutParameter("v_Return", Types.VARCHAR, null, new SqlReturnType() {
                   public Object getTypeValue(CallableStatement cs,
                        int paramIndex, int sqlType, String typeName) throws SQLException {
                   final String str = cs.getString(paramIndex);
                   return str;
               }           
           }));    
           declareParameter(new SqlParameter("your parameter",
                   Types.VARCHAR));
           //set below param true if you want to call database function 
           setFunction(true);
           compile();
           }
   

2. 覆盖存储过程调用的执行方法如下

   public Map<String, Object> execute(String someParams) {
                final Map<String, Object> inParams = new HashMap<String, Object>(8);
                inParams.put("my param", "some value");
                Map outMap = execute(inParams);
                System.out.println("outMap:" + outMap);
                return outMap;
            }
   

希望这对你有所帮助.