package com.atguigu.jdbc;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
/**
* 使用 QueryRunner 提供其具体的实现
* @param <T>: 子类需传入的泛型类型.
*/
public class JdbcDaoImpl<T> implements DAO<T> {
private QueryRunner queryRunner = null;
private Class<T> type;
public JdbcDaoImpl() {
queryRunner = new QueryRunner();
type = ReflectionUtils.getSuperGenericType(getClass());
}
@Override
public void batch(Connection connection, String sql, Object[]... args) throws SQLException {
queryRunner.batch(connection, sql, args);
}
@Override
public <E> E getForValue(Connection connection, String sql, Object... args) throws SQLException {
return (E) queryRunner.query(connection, sql, new ScalarHandler(), args);
}
@Override
public List<T> getForList(Connection connection, String sql, Object... args)
throws SQLException {
return queryRunner.query(connection, sql,
new BeanListHandler<>(type), args);
}
@Override
public T get(Connection connection, String sql, Object... args) throws SQLException {
return queryRunner.query(connection, sql,
new BeanHandler<>(type), args);
}
@Override
public void update(Connection connection, String sql, Object... args) throws SQLException {
queryRunner.update(connection, sql, args);
}
}
jdbc学习10_DAO接口的实现类。(通过DBUtils实现)
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转载自blog.csdn.net/qq_37858042/article/details/81538200
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