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                ## SQLExecutor定制 SQLExecutor是核心類, 負責底層的JDBC 執行,SQLManager會調用SQLExecutor得到執行結果,SQLExecutor有來三個類 * BaseSQLExecutor是核心類,執行JDBC操作 * BaseStatementOnlySQLExecutor 對于不支持PreparedStatement的數據庫引擎使用此 * QuerySQLExecutor,只支持查詢不支持更新的SQL查詢引擎使用,所有更新API都會拋出異常 SQLExecutor是在SQLManager中每次調用通過dbStyle.buildExecutor創建一個新的實例,因此可以擴展DBStyle來 可以擴展如上任何一個子類 ```java public interface DBStyle { SQLExecutor buildExecutor(ExecuteContext executeContext); } ``` 如下是一個BaseSQLExecutor擴展,假設對某些查詢,需要設置JDBC Fetch Size ```java public static class MyExecutor extends BaseSQLExecutor{ public MyExecutor(ExecuteContext executeContext) { super(executeContext); } @Override protected ResultSetHolder dbQuery(Connection conn, String sql, List<SQLParameter> jdbcPara) throws SQLException { if(this.getExecuteContext().target!= UserEntity.class){ return super.dbQuery(conn,sql,jdbcPara); } //對于UserEntity對象查詢,考慮使用特殊設置 PreparedStatement ps = conn.prepareStatement(sql,ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY); ps.setFetchSize(100000); this.setPreparedStatementPara(ps, jdbcPara); ResultSet rs = ps.executeQuery(); return new ResultSetHolder(ps, rs); } } ``` 設計一個新的DBStyle ```java public static class XXXStylePlus extends MySqlStyle { @Override public SQLExecutor buildExecutor(ExecuteContext executeContext){ return new MyExecutor(executeContext); } } ```
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