dbf文件简介
dbf 文件的接收和使用工具可以参考
dbf jdbc 驱动简介
目前市面上有的dbf jdbc驱动都是商业软件，需要收费，所以自己动手写了一个简单的dbf jdbc驱动，常见的商业收费dbf jdbc驱动主要有：
- Caigen DBF
http://www.caigen.com/index.html 是一款商业的dbf文件驱动 - StelsDBF
https://dbf-jdbc.smartcode.com/ 也是一款商业的dbf文件驱动
自研dbf jdbc驱动开发的思路
主要的思路是通过解析sql语句，然后遍历dbf文件，对从dbf文件中读取的记录进行sql语句中条件处理，如下图所示：
设计思路
sql解析工具
主要使用的是JSqlParser，这个工具解析sql非常容易理解，代码风格一致，主要是使用了设计模式中的访问者模式；
dbf文件读取工具
使用的是[# dans-dbf-lib]，对其进行了进一步的封装。
使用简介
自研dbf jdbc驱动查询代码式例
package com.framework.yjk.test;
import com.framework.yjk.DbfJdbcDriver;
import com.framework.yjk.DbfStatement;
import java.io.PrintWriter;
import java.sql.*;
/**
* @author yujiakui
* @version 1.0
* Email: [email protected]
* date: 2018/9/11 18:32
* description：
**/
public class TestSelectMain {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
DriverManager.setLogWriter(new PrintWriter(System.out, true));
//Class.forName("com.haiyi.framework.dbf.DbfJdbcDriver");
DbfJdbcDriver.registDriver();
Connection connection = DriverManager.getConnection("jdbc:yjk:dbf:src/test/resources");
DbfStatement statement = (DbfStatement) connection.createStatement();
/*String query = "SELECT rec_num as A FROM zq_order where rec_num = 2000000 and STOCK_CODE = '500500' LIMIT 1";*/
String query = "SELECT * FROM zq_order where rec_num = 3 ";
statement.execute(query);
ResultSet resultSet = statement.getResultSet();
System.out.println(resultSet);
ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
int colNum = resultSetMetaData.getColumnCount();
int recordNum = 0;
while (resultSet.next()) {
for (int i = 1; i <= colNum; i++) {
System.out.println("列名" + resultSetMetaData.getColumnName(i) + " : value " + resultSet.getObject(i));
}
System.out.println("-----------");
recordNum++;
}
System.out.println("----记录条数---" + recordNum);
}
}
自研dbf jdbc驱动插入代码式例
package com.framework.yjk.test;
import com.framework.yjk.DbfJdbcDriver;
import com.framework.yjk.DbfStatement;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
/**
* @author yujiakui
* @version 1.0
* Email: [email protected]
* date: 2018/9/11 18:32
* description：
**/
public class TestInsertMain {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
DriverManager.setLogWriter(new PrintWriter(System.out, true));
//Class.forName("com.haiyi.framework.dbf.DbfJdbcDriver");
DbfJdbcDriver.registDriver();
Connection connection = DriverManager.getConnection("jdbc:yjk:dbf:src/test/resources");
DbfStatement statement = (DbfStatement) connection.createStatement();
String query = "insert into zq_order(REC_DATE,OB_SETTLE,REC_NUM,STOCK_CODE,WITHDRAW,STATUS,S_QTY,\n" +
"PRODUCT,B_QTY,REC_TIME,SETTLE,FIRM,ACC,OB_COMPANY,OB_ACC,ORDER_TYPE,STOCK_NAME,B_PRICE,\n" +
"TRADE_TYPE,DIR,OB_FIRM,OB_TRADER,COMPANY,S_PRICE,ICE_QTY,TRADER,NICKED,REF_ID)\n" +
"values('20180628', null, 20243000, '500500',null ,'U', null, '01', 1, '180013',null , \n" +
"'88839', 'D890008091', null,null , '1', null, 100, null, 'B',null , null, '277',null, \n" +
"0, null, 'N', '1551030189')";
statement.execute(query);
System.out.println("----插入---");
}
}
自研dbf jdbc驱动删除代码式例
package com.framework.yjk.test;
import com.framework.yjk.DbfJdbcDriver;
import com.framework.yjk.DbfStatement;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
/**
* @author yujiakui
* @version 1.0
* Email: [email protected]
* date: 2018/9/12 8:35
* description：
**/
public class TestDeleteMain {
public static void main(String[] args) throws SQLException {
DriverManager.setLogWriter(new PrintWriter(System.out, true));
//Class.forName("com.haiyi.framework.dbf.DbfJdbcDriver");
DbfJdbcDriver.registDriver();
Connection connection = DriverManager.getConnection("jdbc:yjk:dbf:src/test/resources");
DbfStatement statement = (DbfStatement) connection.createStatement();
String query = "delete from zq_order where rec_num = 2";
statement.execute(query);
}
}
自研dbf jdbc驱动更新代码式例
package com.framework.yjk.test;
import com.framework.yjk.DbfJdbcDriver;
import com.framework.yjk.DbfStatement;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
/**
* @author yujiakui
* @version 1.0
* Email: [email protected]
* date: 2018/9/12 8:56
* description：
**/
public class TestUpdateMain {
public static void main(String[] args) throws SQLException {
DriverManager.setLogWriter(new PrintWriter(System.out, true));
//Class.forName("com.haiyi.framework.dbf.DbfJdbcDriver");
DbfJdbcDriver.registDriver();
Connection connection = DriverManager.getConnection("jdbc:yjk:dbf:src/test/resources");
DbfStatement statement = (DbfStatement) connection.createStatement();
String query = "update zq_order set order_type = 2 where rec_num = 6";
statement.execute(query);
}
}
源码地址
源码地址：https://github.com/lwjaiyjk/DbfJdbcDriver
参考
- https://github.com/jprante/jdbc-driver-csv