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In EF, the update operation ID is auto-incrementing but not the primary key. Partial attributes of the object are updated based on ViewModel. efviewmodel
// ID auto-increment, but not the primary keyPublic int Update_join
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In today's project, we need to get the newly inserted auto-growth primary key values:pstmt=conn.preparestatement (SQL);... rs =pstmt.getgeneratedkeys ();Who knows the error:Generated keys not requested. You need to specify Statement.return_generated_keys to Statement.execuAfter surfing the net to know the original is 5
expression)--the condition in the conditional expression is concatenated with the relational operator --Default value constraint: ALTER TABLE table name Add Constraint df_ field name Default ' defaults ' for field name--where ' default ' is the value you want to default, note ' for ' --delete the created constraint: ALTER TABLE table name DROP constraint constraint name--the constraint name is the constraint name you created earlier, such as: Pk_ field --NOTE: If the constraint was created wh
First, let's look at a simple insert operation:
Testdatacontext Dc = new testdatacontext ();Protected void page_load (Object sender, eventargs E){Tbl_user user = new tbl_user ();User. uname = "XY ";User. upwd = "111 ";DC. tbl_user.insertonsubmit (User );DC. submitchanges ();
Int id = user. uid;}
Int id = user. UID to get the inserted value! Why?
1. When we set the uid in the database, we set it as the primary ke
Auto increment of ID fields in the SQL _Oracle table
Objective: To automatically increment the ID field when inserting data into a table.
Start the experiment:
(1) Create an experiment table
Createtable test_ID_add
(
Id number (10 ),
USERNAME VARCHAR2 (32 ),
TEL VARCHAR2 (11 ),
CREATE_DATE datedefasyssysdate
);
(2) cr
Tags: There is a nbsp Insert database image pre char inf MYSQLet's start by talking about the primary key and the unique index: a table of one database has only one primary key , and a primary key cannot repeat a unique index: a s
Reprint for self-study
ERROR 1075 (42000): incorrect table definition; There can is only one auto column and it must be defined as a key
Mysql> CREATE TABLE ANIMALS1 (
-> grp ENUM (' Fish ', ' mammal ', ' bird ') not NULL,
-> ID mediumint not NULL auto_increment,
-> name CHAR (not NULL),
-> PRIMARY KEY (grp,id)
->) En
Mysql creates a table and sets the primary key auto-incrementing bitsCN.com
Mysql creates a table and sets primary key auto-incrementing mysql tables: mysql> create table user (-> userid int (4)
In Powerdesinger, the auto-generated primary key name is automatically truncated if the table name is too long.Resolved as follows: Database/edit current dbms/scripts/objects/pkey/constname to find value inThe default is pk_%. The U27:TABLE%,U27 represents a 27-character intercept. Change to pk_%table% primary
When knocking on the computer room charging system, when encountered adding time always through the VB end of the call to add to the current time to SQL Server, and sometimes because of the addition of time format is not unified to cause some small problems, now only know that the original is their own ignorance, SQL Server
SQL's self-increment column is very easy to use, just the development process once deleted data, the identity column is not continuous write up is also very depressed, so looked up the identification column reset method found can be divided into three kinds:---Delete the original table data and reset the self-increment columnTRUNCATE TABLE tablename--truncate mode you can also reset the self-
Label:The test script is as follows: 1 CREATE TABLE test1
2 (
3 ID int primary key auto_increment,
4 name varchar ()
5); Test code: 1 package Me.gacl.demo;
2
3 import java.sql.Connection;
4 Import java.sql.PreparedStatement;
5 import Java.sql.ResultSet;
6 Import me.gacl.utils.JdbcUtils;
7
8 public class Test {
9 public static void Main (string[] args) { Connection conn = nu
Because in the SQL-SERVER, the auto-incrementing column property cannot be directly modified, but you can achieve it through the following method:
1. If you only insert a specified value, use the following statement to temporarily cancel the operation.
Set identity_insert tablename onInsert into tablename (XX, XX) values (XX, XX)Set identity_insert tablename of
The following error occurred today when you created a table with a federated master build:
ERROR 1075 (42000): incorrect table definition; There can is only one auto column and it must be defined as a key
Mysql> CREATE TABLE ANIMALS1 (
-> grp ENUM (' Fish ', ' mammal ', ' bird ') not NULL,
-> ID mediumint not NULL auto_increment,
-> name CHAR (not NULL),
-> PRIMARY
Simple tutorial on SQL statements in linux --- primary key, foreign key, and SQL
Primary Key)Each item in is a unique value in the table. In other words, it is used to uniquely identify
relational operators --default value constraint:Alter TableTable nameAdd constraintdf_ Field namedefault 'Default Value' forField name--where ' default ' is the value you want to default, note ' for ' --to delete a created constraint:Alter TableTable nameDrop constraintConstraint name--The constraint name is the constraint name you created earlier, such as: Pk_ field--NOTE: If the constraint was created when the table was created, it cannot be deleted with the command--can only be deleted in '
Tags: style color ar using SP strong file data onSQL Server allows the user to set the database initial and maximum values, which can be configured by auto-grow or auto-shrink. With these configurations, we can prevent application modifications that could be caused by database space problems, or when SQL
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