Updating a row in sql using jdbc


07-Mar-2020 23:35

Specifically, in this example, you'd probably already know the "id" for the user Fred, and when you go to update Fred's data, you would normally do it like this: but because this is a sample program, I decided to show the query this way.After this Java My SQL UPDATE query runs, you can verify that it worked by looking at the data from the My SQL command prompt, running a SELECT query like this: ---- ------------ ----------- --------------------- ---------- ------------ | id | first_name | last_name | date_created | is_admin | num_points | ---- ------------ ----------- --------------------- ---------- ------------ | 2 | Fred | Flinstone | 2010-06-23 | 0 | 6000 | ---- ------------ ----------- --------------------- ---------- ------------ 1 row in set (0.00 sec) In "real world" Java database programs I almost always use the Spring JDBC libraries to access a database, but when you're first getting started, or working on small programs, I think it's important to see examples like this so you can understand how things work under the covers.The result is (same time unit): Run 0, Statement 1: PT4.546S Run 0, Statement 2: PT3.52S Run 0, Statement 3: PT0.144S Run 0, Statement 4: PT0.028S Run 1, Statement 1: PT3.712S Run 1, Statement 2: PT3.185S Run 1, Statement 3: PT0.138S Run 1, Statement 4: PT0.025S Run 2, Statement 1: PT3.481S Run 2, Statement 2: PT3.007S Run 2, Statement 3: PT0.122S Run 2, Statement 4: PT0.026S Run 3, Statement 1: PT3.518S Run 3, Statement 2: PT3.077S Run 3, Statement 3: PT0.113S Run 3, Statement 4: PT0.027S Run 4, Statement 1: PT3.54S Run 4, Statement 2: PT2.94S Run 4, Statement 3: PT0.123S Run 4, Statement 4: PT0.03S The difference between Statement 1 and 4 is a factor of 100x !! Again (by far): Statement 4, running the bulk update In fact, the time is not too far away from the time taken by PL/SQL.With larger data sets being updated, the two results will converge. While we're running individual row-by-row updates, we're sending all the update statements in one batch to the SQL engine.

updating a row in sql using jdbc-70

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Typically in a database program like this you'll end up updating rows based on the primary key of the database table.*/ public void execute Sql(String ip, int port, String db Name, String user Name, String password, String sql) /* Close statement and connection after use, this can avoid resource waste.



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