给JFinal添加 Sqlite 数据库支持

来源：互联网发布：薛之谦淘宝衣服贵吗编辑：程序博客网时间：2024/06/07 01:46

[转自] http://my.oschina.net/u/237078/blog/69934

Sqlite 的单文件便携性、高性能在开发中方便性无与伦比，即使部署在中小型应用中也胜任有余。

在JFinal中添加对 Sqlite 的支持 Step by Step：

1、点击 http://www.xerial.org/maven/repository/artifact/org/xerial/sqlite-jdbc/3.7.2/sqlite-jdbc-3.7.2.jar 下载 sqlite JDBC驱动，并将其放入 Jfinal_app/WEB-INF/lib ；

2、下载一个Sqlite的数据库管理工具，推荐 Navicate Premium，在此下载：http://www.navicat.com/en/products/navicat_premium/premium_overview.html ；或者你也可以到 Sqlite 官网下载Sqlite Shell ，当前版本是 3.7.13: http://www.sqlite.org/sqlite-shell-win32-x86-3071300.zip ；

3、使用数据库管理工具创建一个数据库，存放路径为 Jfinal_app/WEB-INF/data.db ；创建必要的表，插入测试记录，等等；

4、在 a_little_config.txt （或你自己的配置文件）中设置：

jdbcUrl = jdbc:sqlite:D:/webs/Jfinal_app/WEB-INF/data.db
user =
password =
devMode = true

5、新建一个类 Sqlite3Dialect.java ：（注：也可以等待JFinal 1.1.1版Jar将增加此类）

package com.jfinal.plugin.activerecord.dialect; import java.util.List;import java.util.Map;import java.util.Map.Entry;import java.util.Set;import com.jfinal.plugin.activerecord.ActiveRecordException;import com.jfinal.plugin.activerecord.Record;import com.jfinal.plugin.activerecord.TableInfo; /** * Sqlite3Dialect. Try to use Sqlite3 SQL dialect with ActiveRecordPlugin. * <p> * A clever person solves a problem. A wise person avoids it. */public class Sqlite3SqlDialect implements IDialect {         public String forTableInfoBuilderDoBuildTableInfo(String tableName) {        return "select * from " + tableName + " where 1 = 2";    }         public void forModelSave(TableInfo tableInfo, Map<String, Object> attrs, StringBuilder sql, List<Object> paras) {        sql.append("insert into ").append(tableInfo.getTableName()).append("(");        StringBuilder temp = new StringBuilder(") values(");        for (Entry<String, Object> e: attrs.entrySet()) {            String colName = e.getKey();            if (tableInfo.hasColumnLabel(colName)) {                if (paras.size() > 0) {                    sql.append(", ");                    temp.append(", ");                }                sql.append(colName);                temp.append("?");                paras.add(e.getValue());            }        }        sql.append(temp.toString()).append(")");    }         public String forModelDeleteById(TableInfo tInfo) {        String pKey = tInfo.getPrimaryKey();        StringBuilder sql = new StringBuilder(45);        sql.append("delete from ");        sql.append(tInfo.getTableName());        sql.append(" where ").append(pKey).append(" = ?");        return sql.toString();    }         public void forModelUpdate(TableInfo tableInfo, Map<String, Object> attrs, Set<String> modifyFlag, String pKey, Object id, StringBuilder sql, List<Object> paras) {        sql.append("update ").append(tableInfo.getTableName()).append(" set ");        for (Entry<String, Object> e : attrs.entrySet()) {            String colName = e.getKey();            if (!pKey.equalsIgnoreCase(colName) && modifyFlag.contains(colName) && tableInfo.hasColumnLabel(colName)) {                if (paras.size() > 0)                    sql.append(", ");                sql.append(colName).append(" = ? ");                paras.add(e.getValue());            }        }        sql.append(" where ").append(pKey).append(" = ?");        paras.add(id);    }         public String forModelFindById(TableInfo tInfo, String columns) {        StringBuilder sql = new StringBuilder("select ");        if (columns.trim().equals("*")) {            sql.append(columns);        }        else {            String[] columnsArray = columns.split(",");            for (int i=0; i<columnsArray.length; i++) {                if (i > 0)                    sql.append(", ");                sql.append(columnsArray[i].trim());            }        }        sql.append(" from ");        sql.append(tInfo.getTableName());        sql.append(" where ").append(tInfo.getPrimaryKey()).append(" = ?");        return sql.toString();    }         public String forDbFindById(String tableName, String primaryKey, String columns) {        StringBuilder sql = new StringBuilder("select ");        if (columns.trim().equals("*")) {            sql.append(columns);        }        else {            String[] columnsArray = columns.split(",");            for (int i=0; i<columnsArray.length; i++) {                if (i > 0)                    sql.append(", ");                sql.append(columnsArray[i].trim());            }        }        sql.append(" from ");        sql.append(tableName.trim());        sql.append(" where ").append(primaryKey).append(" = ?");        return sql.toString();    }         public String forDbDeleteById(String tableName, String primaryKey) {        StringBuilder sql = new StringBuilder("delete from ");        sql.append(tableName.trim());        sql.append(" where ").append(primaryKey).append(" = ?");        return sql.toString();    }         public void forDbSave(StringBuilder sql, List<Object> paras, String tableName, Record record) {        sql.append("insert into ");        sql.append(tableName.trim()).append("(");        StringBuilder temp = new StringBuilder();        temp.append(") values(");                 for (Entry<String, Object> e: record.getColumns().entrySet()) {            if (paras.size() > 0) {                sql.append(", ");                temp.append(", ");            }            sql.append(e.getKey());            temp.append("?");            paras.add(e.getValue());        }        sql.append(temp.toString()).append(")");    }         public void forDbUpdate(String tableName, String primaryKey, Object id, Record record, StringBuilder sql, List<Object> paras) {        sql.append("update ").append(tableName.trim()).append(" set ");        for (Entry<String, Object> e: record.getColumns().entrySet()) {            String colName = e.getKey();            if (!primaryKey.equalsIgnoreCase(colName)) {                if (paras.size() > 0) {                    sql.append(", ");                }                sql.append(colName).append(" = ? ");                paras.add(e.getValue());            }        }        sql.append(" where ").append(primaryKey).append(" = ?");        paras.add(id);    }         public void forPaginate(StringBuilder sql, int pageNumber, int pageSize, String select, String sqlExceptSelect) {        int offset = pageSize * (pageNumber - 1);        sql.append(select).append(" ");        sql.append(sqlExceptSelect);        sql.append(" limit ").append(offset).append(", ").append(pageSize); // limit can use one or two '?' to pass paras    }}

6、在DemoConfig.java （或你自己的 Config 类）中：

import com.jfinal.plugin.activerecord.dialect.Sqlite3Dialect;public void configPlugin(Plugins me) {    // 配置C3p0数据库连接池插件    C3p0Plugin c3p0Plugin = new C3p0Plugin(getProperty("jdbcUrl"), getProperty("user"), getProperty("password"));            c3p0Plugin.setDriverClass("org.sqlite.JDBC"); //指定驱动程序            me.add(c3p0Plugin);     // 配置ActiveRecord插件    ActiveRecordPlugin arp = new ActiveRecordPlugin(c3p0Plugin);    me.add(arp);            arp.setDialect(new Sqlite3Dialect());  //指定 Dialect            arp.addMapping("blog", Blog.class); // 映射blog 表到 Blog模型}

7、至此大功告成！启动，服务器，在浏览器中查看效果吧！

0 0