JDBCUtils如何写
那个JDBCUtils工具类如何写，求大神指点
3 回答
这咋整?
版本1：
import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.DataSource;
import com.mchange.v2.c3p0.ComboPooledDataSource;
public class JDBCUtil {
private static DataSource dataSource = new ComboPooledDataSource();
public static DataSource getDataSource() {
return dataSource;
}
public static Connection getConnection() throws SQLException {
return dataSource.getConnection();
}
}
版本2：
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBCUtil1 {
private static String url = "jdbc:mysql://localhost:3306/regist_web";
private static String user = "root";
private static String password = "test123";
private JDBCUtil1() {}
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static Connection getConnection() {
try {
return DriverManager.getConnection(url, user, password);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}
public static void free(ResultSet rs,Statement st,Connection conn) {
if(rs != null) {
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if(st != null) {
try {
st.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if(conn != null) {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
}
}
}
视频中用的是版本1，我用版本1在daoImpl（）里有点问题，所以我用的是版本2。
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