select from multiple tables

When a database is inserted, when multiple tables are joined, it does not seem easy to do. for example, in Table a, Table B, insertintoa ('text') values ('Hello'); idprimaryasc then generates an auto-incremental id number, then I want to store this id in Table B. It seems that mysql_insert_id () can be used. However, if many users operate on this id at the same time, I don't know what the situation is, beca

C # displays the data information of multiple tables in the database hierarchically, For example, how can we load the content of three tables into the same form? To implement the above query results, we need to get the Student name from the Student table, the Subject name from the Subject table, and the test score and time from the StudentResult table. Generally

Testdao) {This.testdao=testdao;}public void Saveoperate () {This.testDAO.insertTable1 ();This.testDAO.insertTable2 ();This.testDAO.insertTable3 ();}}5. Front-desk calls, such as: Aciton layer L Public string Saveoperate (string params) { string returnstr = ""; stringbuffer ERRORSB = new StringBuffer ("["); try { webapplicationcontext appcontext=webapplicationcontextutils. Getwebapplicationcontext (This.getservlet (). Getservletcontext ()); itestservice Service = (itestservice) appContex

Oracle multi-table insert all statement: SQL code create table ORDERS (CUSTOMER_ID NUMBER, SUM_ORDERS NUMBER); create table small_customers (CUSTOMER_ID NUMBER, SUM_ORDERS NUMBER ); create table medium_customers (CUSTOMER_ID NUMBER, SUM_ORDERS NUMBER); create table large_customers (CUSTOMER_ID NUMBER, SUM_ORDERS NUMBER); create table order_sums (CUSTOMER_ID NUMBER, SUM_ORDERS NUMBER ); SQL code insert into ORDERS (CUSTOMER_ID, SUM_ORDERS) values (1000, 10); insert into ORDERS (CUSTOMER_ID, SUM_O

这个属性的数组 foreach ($v as $k 1=> $v 1) {#在循环插件数据, $is _ok= $good _attr->data (Array ( ' goods_id ' = $goods _id, ' attr_id ' + $k, ' attr_value ' + $v 1,)]->add (); /* if ($is _ok===false) {mysql_query ("ROLLBACK"); return FALSE; } */}}else{#说明是单个值 $is _ok= $good _attr->data (' goods_id ' = $goods _id, ' attr_id ' = $k, ' attr_value ' + $v,)]->add (); /* if ($is _ok===false) {mysql_query ("ROLLBACK"); return FALSE; }*/ } } } }　　Thinkphp handles

If the data in a table is very large and the data in the table has multiple statuses, the query will be very slow. What should we do? First, you need a summary table, which stores the IDs of all data. Other data is saved into N tables according to N states. In this way, you only need to query a certain type of data in the corresponding table. In this case, the query results will be very fast. However,

PHP operations on the database. Insert multiple tables at a time Public function add ($ u_id, $ name, $ big_classes) {if (! Self: $ object) {return 102;} $ SQL = 'Insert classes (cl_big_classes, cl_name) value ('. $ big_classes. ',\''. $ name. '\') '; $ this-> SQL-> query ($ SQL); if ($ this-> SQL-> affected_rows In theory, two queries are executed separately. The second sentence will not be executed. H

Fill in records with the same fields in multiple tables for guidance Why is this wrong? $username = $_post[' username '); $password = $_post[' psd ']; $sex = $_post[' sex ']; $grade = $_post[' grade '); $age = $_post[' age ']; $height =$_post[' height ']; $weight =$_post[' weight ']; Check form data if (!preg_match ('/^[\w\x80-\xff]{3,15}$/', $username)) { Exit (' ERROR: User name does not meet requireme

Inserting data into multiple tables in PHP

: Update entity:usertoupdate with the values in model binder. As you can see, we used a whitelist to specify the fields in the database that need to be updated.TryUpdateModel (Usertoupdate, "", new string[] {"LoginName", "Email", "Password", "CreateDate", "Sysdepartmentid"})B. Update the Sysuserrole table: Compare the values in the database with the edited values, the basic logic is: if it is selected, the original is not to be added, if not selected, the original has to be deleted.Updateuserrol

// // Merge multiple tables with the same structure // /// // Function Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->1 public DataTable GetAllDataTable (DataSet ds) 2 { 3 DataTable newDataTable = ds. Tables [0]. Clone (); // create a new table Clone to have a table schema. 4 object [] objArray = new object [new

Use of Delete to delete multiple tables 1. Delete all matching records with ID values in Table T2. Delete T1 from T1, T2 where t1.id = t2.id Or Delete from T1 using T1, T2 where t1.id = t2.id 2. Find and delete no matching records in data table T2. Delete T1 from T1 left join T2 on t1.id = t2.id where t2.id is null Or Delete from T1, using T1 left join T2 on t1.id = t2.id where t2.id is null 3. F

SELECT * FROM table1 inner join table2 on Table1.id=table2.idIn fact INNER JOIN ... The syntax format for on is summarized as follows:From ((Table 1 INNER join table 2 on table 1. Field number = Table 2. Field number) INNER join table 3 on table 1. Field number = Table 3. Field number) INNER join table 4 on Member. Field number = Table 4. Field number) INNER Join Table X on Member. Field number = table X. Field numberYou just have to apply the format.

This article shares an article about how to delete joined data when multiple tables are joined and deleted in mysql. For more information, see this article. This article shares an article about how to delete joined data when multiple tables are joined and deleted in mysql. For more information, see this article. Ca

PHP operations on the database. Insert this post to multiple tables at a time and then edit public nbsp; function nbsp; add ($ u_id, nbsp; $ name, nbsp; $ big_classes) { nbsp; I PHP operate on the database. Insert multiple tables at a time This post was last edited by xuzuning at 19:00:56 on Public function add ($

1:hibernate queries with a deeper query, using detachedcriteria multiple table queries. There are two table Clazz,user in the database, because it is a test program, the foreign key is not set, and the associated attribute between two objects is not included in the mapping file, such as It's just that when you write an hql, you implement an association between two objects, similar to the Sql:select c.id,c.name,c.age,u.name from Clazz p,user u where

Recently, csdn has found many questions about this problem. I encountered this problem when I was writing a program, but it has already been solved. Now I will explain how to solve this problem. Example: Two tables, named corp_info, with the field ID, name, type ,......, The other is product, with the field name ID, product_name, date, ammount ,...... . In these two tables, the ID of the table corp_info is

There are currently 3 tables a B C The demand is a and B inline query results, and then leftist c table (c data is not complete) My wording is SELECT * from a B left JOIN C on a.id=c.id WHERE a.id=b.id ORDER by ID Although there is no error, but the result is wrong ... How do I write a statement to find out the right results? Reply content: There are currently 3

The WPS table generates multiple folders: First, create a wps table. Open the WPS table, enter the "filename" in the first row, and, if necessary, enter the name of the file you want to generate in batches, where the first filename entered is 20160701. After entering the first file name, move the mouse to the bottom right corner of the selection box, Drop-down, and regularly generate mult