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name:" + tableName);System.out.println ("Get column" + i + "is automatically incremented:" + isautoinctement);System.out.println ("Get column" + i + "in the database is currency type:" + iscurrency);System.out.println ("Get column" + i + "is empty:" + isnullable);System.out.println ("Get column" + i + "is read-only:" + isreadonly);System.out.println ("Get column" + i + "can appear in Where:" + issearchable);}} catch (SQLException e) {E.printstacktrac
Five types of constraints in the databaseFive kinds of constraints in database and their adding methods five constraints 1.--PRIMARY KEY constraint (Primay key coustraint) uniqueness, non-nullability 2.--unique constraint (unique counstraint) uniqueness, can be empty, but only one The 3.--check constraint (check counstraint) limits the range, format of the column data (for example, age, gender, and so on)
int, bigint, smallint, and tinyintAn exact numeric data type that uses integer data.bigintInteger data (all numbers) from -2^63 (-9223372036854775808) to 2^63-1 (9223372036854775807). The storage size is 8 bytes.IntInteger data (all numbers) from -2^31 (-2,147,483,648) to 2^31-1 (2,147,483,647). The storage size is 4 bytes. The SQL-92 synonymous word for int is integer.MallintInteger data from -2^15 (-32,768) to 2^15-1 (32,767). The storage size is 2 bytes.tinyintInteger data from 0 to 255. The
or in the application. DB2's jdbc type 4 driver is called a universal driver and implemented in Java only. This driver also supports SQLJ. Currently, no JDBC driver for TYPE 1 is provided by IBM. The packages of these types of drivers are: db2 driver type jcc. jar and sqlj.zip files, sqllibbindb2jcct2. dll (this file is required by type2 ). Use When connecting DB2 UDB V7.2 and DB2 UDB V8.1 using JDBC, if you encounter some confusing problems, you can
Label:Atitit. various data types( tree structure , table-shaped data ) the structure and storage database Attilax Summary1. Data structure (tree structure, table shape data, object structure) 12. Corresponding data structure in programming languages Java C # php (Dic/map List DataTable) 13. Database Storage data 14. Table-Shaped display of data (multiple records
):Decimal (m,d) fixed-point type floating-point types hold approximate values in the database, while fixed-point types hold exact values in the database. The parameter m is the maximum number (precision) of a fixed-point type number with a range of 0~65,d digits to the right of the decimal point and a range of 0~30, bu
inserted string is lower than the upper limit, the system automatically reduces it to the true length of the string. Number (m, n): Can be used to represent both integer and floating point types. However, m cannot exceed 38. If n is 0 or n is omitted, it indicates that it is an integer. Date: used to store the date and time Blob: it is usually used in applications, rather than directly using SQL commands in databases. For example, you can use JDBC to
{ //control the upload file type if(($_files["File2"] ["Type"]== "Application/octet-stream" | |$_files["File2"] ["Type"]== "FLV/QSV") $_files["File2"] ["Size"]) { //Locate the location where the file is stored $file 2name= "./file/".Date("Ymdhis").$_files["File2"] ["Name"];//added. Splicing//Conversion encoding format $file 2name=Iconv("UTF-8", "gb2312",$file 2name); //determine if a file exists if(file_exists($file 2name)) { Echo"
Whether in a small free database space or a large e-commerce website, it is necessary to reasonably design the table structure and make full use of the space. This requires us to fully understand the Common Data Types of database systems. Next I will share some of my experiences with you. 1. digit type. The numeric types
choiceSummarize:Use GUIDs. There is no duplication problem, and data merging is very simple. The association speed is slower than int. It is best to use this scenario for frequently merging data or offline input data online uploads.The GUID value is random and does not accept any form that can be more meaningful to the user. There is no way to determine the order in which the GUID values are generated, so it is not suitable for existing applications that increment index key values in the loop o
Effectively optimize the performance of the VPS, improve the running speed of the VPS server, in addition to a reasonable configuration of the Web server, more is the need for us to be able to optimize the Web site procedures and website database, the optimization of the site database is the most basic optimization measures is to establish the database index, her
In many application systems, although a database is generally used for running, the business system may be deployed on different types of databases due to various situations, if the developed system can easily support switching between multiple databases, it can reduce a lot of troubles and improve the adaptability and robustness of the system. In another case, due to the constant expansion of the business
SPL 3.0 officially released, Litre Level description After a period of modification,SPL Finally rose3.0 To be promoted3.0 , Mainly because two connection methods are added:ODP. net AndODBC ODP. net Greatly enhancedSPL PairOracle Database access capability, currently usedODP. net ConnectionOracle Is the best choice, relatedArticleYou can find it on the Internet. There are quite a few. ODBCYes. Net framewo
Database type of column: Currently, there are only 2 kinds of types: int, char Column type:1. Number types2. String type3. Date typeInteger type in number type:Tinyint of 1 bytes -128~127SmallInt of 2 bytes -32768~32767Mediumint of 3 bytes-8388608 ~ 8388607int accounted for 4 bytes -2147483648~2147483647BigInt occupies 8 bytes anyway the range is larger than int.How do you choose these integer
Tags: bin time interval Basic date values today knowledge three times simplePreface Today go to fitness, feel the body practice good or good, gossip not to say, the data types encountered in this database today all here to speak clearly, after seeing what data type, I should know, for me, the most unfamiliar should be the time type this piece. But through today's study, has already doubts. Just follow my rh
The description of the DB2 database driver type is the main content of this article. At the same time, this article also describes the early CLI-based Drivers, recent pure Java drivers, and the combination of CLI and Java. for a specific DB2 version, the driver has a specific driver and a general driver, which is obvious. General description In the database product line of IBM, there are many data access
H2 database functions and data types I. Common H2 Database Data Types INT type: corresponding to java. lang. Integer REAL Type: corresponding to java. lang. Float DOUBLE Type: corresponding to java. lang. Double DECIMAL type: corresponding to java. math. BigDecimal, such as DECIMAL (20, 2) CHAR type: corresponding to j
Oracle Common database field typesCommon database field types are as follows: Field type Chinese description restrictions other description CHAR fixed length string max length bytes VARCHAR2 variable length string maximum length 4000 bytes can do index maximum length 749 NCHAR by character Set fixed length string maximum length bytes NVARCHAR2 variable length str
Label:Data type of database: integer: Int,smallint,bigint,decimal real type: float,real. String type:Char/nchar,Varchar/nvarchar. 1. There is no difference between VAR: a variable-length string type with Var, and a fixed length string without var. Fixed-Length field, if the stored data does not reach the maximum length, the system will fill the string behind the input space. When the recorded data has a fixed length, the selected length (Char/nchar) i
The database engine you can use depends on how mysql is compiled during installation. To add a new engine, you must recompile MYSQL. By default,MYSQL supports three engines: ISAM, MYISAM, and HEAP..The other two types of INNODB and BERKLEY (BDB) are also frequently used.ISAMISAM is a well-defined and time-tested data table management method. It is designed to take into account that the number of
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