1.T execute(ConnectionCallback<T> action) 主要結構 使用了ConnectionCallback中的方法作為回撥方法
 public <T> T execute(ConnectionCallback<T> action) {
    Connection con = DataSourceUtils.getConnection(getDataSource());
            Connection conToUse = con;
            if (this.nativeJdbcExtractor != null
 
) {
                // Extract native JDBC Connection, castable to OracleConnection or the like.
                conToUse = this.nativeJdbcExtractor.getNativeConnection(con);
            }
            else {
                // Create close-suppressing Connection proxy, also preparing returned Statements.
 

                conToUse = createConnectionProxy(con);
            }
            return action.doInConnection(conToUse);
        }


 }
 2. T execute(StatementCallback<T> action)
 public <T> T execute(StatementCallback<T> action) throws DataAccessException {

            Connection con = DataSourceUtils.getConnection(getDataSource());
            Statement stmt = null
 
;
            Connection conToUse = con;
            if (this.nativeJdbcExtractor != null &&
                    this.nativeJdbcExtractor.isNativeConnectionNecessaryForNativeStatements()) {
                conToUse = this.nativeJdbcExtractor.getNativeConnection(con);
            }
            stmt = conToUse.createStatement();
            applyStatementSettings(stmt);
            Statement stmtToUse = stmt;
            if (this.nativeJdbcExtractor != null) {
                stmtToUse = this.nativeJdbcExtractor.getNativeStatement(stmt);
            }
            T result = action.doInStatement(stmtToUse);
            handleWarnings(stmt);
            return result;
｝
3. execute(final String sql) ：使用內部類的回撥
public void execute(final String sql) throws DataAccessException {
        if (logger.isDebugEnabled()) {
            logger.debug("Executing SQL statement [" + sql + "]");
        }
        class ExecuteStatementCallback implements StatementCallback<Object>, SqlProvider {
            @Override
            public Object doInStatement(Statement stmt) throws SQLException {
                stmt.execute(sql);
                return null;
            }
            @Override
            public String getSql() {
                return sql;
            }
        }
        execute(new ExecuteStatementCallback());
    }