--mysql--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version><scope>runtime</scope></dependency> 执行SQL时,经过跟踪代码执行路径,最终会到达这个方法:com.mysql.jdbc.PreparedStatement#executeInternal /*** Actually execute the prepared statement. ...
RowId是SQL的内置类型,它是数据库表中行的地址。java.sql包的RowId接口映射有SQL ROWID值。 RowId值对于每一行都是唯一的,它们是访问行的最快方法。您不能将其用作表的主键。 检索RowId对象 您可以使用ResultSet,CallableStatement,PreparedStatement接口的getRowId()方法检索特定行的RowId 。 此方法接受代表列标签的Str...
import java.io.DataInputStream;import java.sql.DriverManager;import java.sql.Connection;import java.sql.Statement;import java.sql.SQLException;public class CRUDOperations{ public static void main(String raghu[])throws SQLException { Connection con=null; try { DataInputStream dis=new DataInputStream(Sy...
Explain statement generally gives the step by step analysis of the queries being executed in the database. It is the plan prepared by PE dispatched to the amps. It could also identify intermediate spool files that would be generated in the process. In addition, EXPLAINS could show whether th...