自定义数据连接

教学视频

说明

Bask Report基于java.util.ServiceLoader机制支持自定义的数数据源，对应的接口：

public interface BuildinDatasourceProvider {
    /**
     * 根据DatasourceDefinition的定义生成java.sql.DataSource对象
     * @param def
     * @return
     */
    DataSource buildDatasource(DatasourceDefinition def);

    /**
     * 销毁java.sql.DataSource对象
     * @param ds
     */
    void destroyDatasource(DatasourceWrapper ds);
}

全路径为：com.basksoft.report.core.model.datasource.BuildinDatasourceProvider

前期准备-ServiceLoader定义

分下面几个步骤来使用：

在resources资源目录下创建META-INF/services文件夹
在services文件夹中创建文件，以接口全名命名，就是：com.basksoft.report.core.model.datasource.BuildinDatasourceProvider

创建接口实现类,参考代码

import com.basksoft.report.core.definition.datasource.DatasourceDefinition;
import com.basksoft.report.core.model.datasource.BuildinDatasourceProvider;
import com.basksoft.report.core.model.datasource.DatasourceWrapper;
import org.apache.commons.dbcp2.BasicDataSource;
import org.apache.commons.dbcp2.BasicDataSourceFactory;

import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.Properties;

public class TestBuildinDatasource implements BuildinDatasourceProvider {
    private static Properties properties = new Properties();
    @Override
    public DataSource buildDatasource(DatasourceDefinition def) {
        // 加载DBCP配置文件
        DataSource dataSource = null;
        properties.put("username", "root");
        properties.put("password", "xxxxx");
        properties.put("driverClassName", "com.mysql.jdbc.Driver");
        properties
                .put("url",
                        "jdbc:mysql://localhost:3306/baskreportsample?useUnicode=true&characterEncoding=UTF-8");
        try {
            dataSource = BasicDataSourceFactory.createDataSource(properties);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dataSource;
    }

    @Override
    public void destroyDatasource(DatasourceWrapper ds) {
        if (ds == null)
            return;
        DataSource datasource = ds.getDatasource();
        if (datasource instanceof BasicDataSource) {
            BasicDataSource basicDatasource = (BasicDataSource) datasource;
            try {
                basicDatasource.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}