Download installer for Mac OS Overview SQuirreL SQL Client is a graphical Java program that will allow you to view the structure of a JDBC compliant database, browse the data in tables, issue SQL commands etc, see Getting Started and Introduction. Downloads Version 1.4.200 (2019-10-14) Windows Installer (SHA1 checksum: 18cf23c0e0e3f7d58a0f232bd39cfe) Platform-Independent Zip (SHA1 checksum. Mar 26, 2013 Download H2 Database Engine for free. H2 is a Java SQL database. In-memory and disk based tables and databases are supported. H2 Database Builder: H2 Database Builder is a database editing tool for MS Access 95, 97 or 2000. In addition to basic editing capabilities, the builder also includes the following: editing of text descriptions, a tool to find database errors, capability to exchange data between databases, and several tools to make the database building process more efficient. H2 Database running really slow on mac OS sierra. I've observed severe slowdown after mac os sierra update i wonder if anyone is experiencing the same problems as i - You received this message.
H2 is an open-source lightweight Java database. It can be embedded in Java applications or run in the client-server mode. Mainly, H2 database can be configured to run as inmemory database, which means that data will not persist on the disk. Because of embedded database it is not used for production development, but mostly used for development and testing.
This database can be used in embedded mode or in server mode. Following are the main features of H2 database −
Features of H2 Database
The main features of H2 Database are as follows −
Additional Features
Following are some additional features of H2 Database −
Components in H2 Database
In order to use H2 Database, you need to have the following components −
Download H2 Database For Macbook Pro
This is a client/server application, so both server and client (a browser) are required to run it.
H2 is a database written in Java. We can easily embed this database to our application by using JDBC. We can run this on many different platforms or any version of Java Runtime Environment. However, before installing the database, there should be Java installed in the system.
Verify Java Installation
If JDK is installed in the system, try the following command to verify the Java version.
If JDk is successfully installed in the system, then we will get the following output.
If JDK is not installed in the system, then visit the following link to Install JDK.
Install H2 Database
We can run this database on many different platforms. In this chapter, we will learn about H2 Database installation on Windows.
Following are the steps to install H2 Database on Windows operating system.
Step 1: Download H2 Setup File
Download the latest version of H2 Database from the given link. In this link, you will get the latest version of H2 database in two types. One is Windows Installer type (that is .exe file) and second is Platform-Independent zip file for other operating systems.
Click the Windows installer for downloading the Windows supportable H2 database after downloading the .exe file. In this case, we are using H2 Database with the version 1.4.192.
Step 2: Install H2 Database
After downloading we get the H2 Windows installer file (i.e. h2-setup-yyyy-mm-dd.exe) in the Downloads directory. To start the installation process of H2 Database, double click on the installer file.
The following screen is the first step in the installation process. Provide a path where we want to install the H2 database server as shown in the following screenshot.
As seen in the above screenshot, by default it will take C:ProgramFiles (x86)H2 as the destination folder. Click next to proceed to the next step. The following screen pops up.
In the above screenshot, click the Install button to start the installation process. After installation, we get the following screenshot.
Click Finish to complete the installation process.
Step 3: Verify H2 Database Installation
After installation, let us verify the database installation in the system. Click Windows → type H2 Console → Click H2 console icon. Connect to the URL http://localhost:8082. At the time of connecting, the H2 database will ask for database registration as shown in the following screenshot.
Fill all the details in the above dialog box such as Saved Settings, Settings Name, Driver Class, JDBC URL, User Name, and Password. In the JDBC URL, specify the database is located and the database name. User Name and Password are the fields for user name and password of the database. Click Connect.
The Database welcome page pops up as shown in the following screenshot.
Select command is used to fetch record data from a table or multiple tables. If we design a select query, then it returns data in the form of result table called result sets.
Syntax
The basic syntax of SELECT statement is as follows −
To fetch all the available fields, use the following syntax.
Example
Consider the CUSTOMER table having the following records −
To get the customer table along with the given data, execute the following queries.
The following command is an example, which would fetch ID, Name and Salary fields of the customers available in the CUSTOMER table.
The above command produces the following result.
Use the following query to fetch all the fields of CUSTOMERS table.
The above query produces the following result −
The SQL INSERT statement is used to add new rows of data to a table in the database.
Syntax
Following is the basic syntax of INSERT INTO statement.
Using this INSERT statement, we can insert a new record or new rows into a table. When using DIRECT clause, the results are directly affected to the target table without any intermediate step. However, while adding values for all the columns of the table, make sure the order of the values is in the same order as the columns in the table.
Example
Let us take an example and try to insert the following given records into the Customer table.
We can get all the given records into the customer table by executing the following commands.
The UPDATE query is used to update or modify the existing records in a table. We can use WHERE clause with UPDATE query to update the selected rows, otherwise all the rows would be affected.
Syntax
Following is the basic syntax of the UPDATE query.
In this UPDATE syntax, we can combine more than one condition by using AND or OR clauses.
Example
Consider the CUSTOMER table having the following records.
If you want to get the customer table along with the given data, execute the following queries.
![]()
The following command is an example, which would update ADDRESS for a customer whose ID is 6 −
Now, CUSTOMERS table would have the following records. We can check the customer table records by executing the following query.
The above query produces the following result.
To modify all ADDRESS and SALARY column values in CUSTOMERS table, we need not use the WHERE clause. The UPDATE query would be as follows −
Now, CUSTOMERS table would have the following records. We can check the customer table records by executing the following query.
The above query produces the following result −
The SQL DELETE query is used to delete the existing records from a table. We can use WHERE clause with DELETE query to delete selected records, otherwise all the records will be deleted.
Syntax
Following is the generic query syntax of the delete command.
The above syntax deletes the rows from a table. If TOP or LIMIT is specified, at most the specified number of rows are deleted (no limit if null or smaller than zero).
Example
Consider the CUSTOMER table having the following records.
The following command will delete the details of the customer, whose ID is 6.
After execution of the above command, check the Customer table by executing the following command.
The above command produces the following output −
If we want to DELETE all the records from CUSTOMERS table, we do not use WHERE clause. The DELETE query would be as follows.
After executing the above command, no records will be available in the Customer table.
BACKUP is the command used to take database backup into a separate .zip file. Objects are not locked, and when it takes backup the transaction log is also copied. Admin rights are required to execute this command.
Syntax
Following is the generic syntax of the Backup command.
Example
In this example, let us take a backup of the current database into backup.zip file. Use the following command for the same.
On executing the above command, you will get the backup.zip file in your local file system.
CALL is a SQL command which belongs to H2 database server. This command is used to calculate a simple expression. It returns the result of the given expression in a single column field. When it returns an array of results, then each element in the array is displayed as a column value.
Syntax
Following is the generic syntax of the CALL command.
We can use the arithmetic expression in this syntax.
Example
Let us take an example and execute an arithmetic expression (15 * 25) using call command.
The above command produces the following output.
EXPLAIN command displays the execution plan for a statement. When we execute a statement using EXPLAIN ANALYZE command, the query plan will include the actual row scan count for each table.
Syntax
Following is the generic syntax of the EXPLAIN command.
Along with this syntax we can use select, insert, delete, and merge.
Example
This example explains the query plan details of the customer with ID 1.
The above command produces the following output −
MERGE command is used to update the existing rows and insert new rows into a table. The primary key column plays an important role while using this command; it is used to find the row.
Syntax
Following is the generic syntax of the MERGE command.
In the above syntax, the KEY clause is used to specify the primary key column name. Along with VALUES clause, we can use primitive values to insert or we can retrieve and store another table values into this table using the select command.
Example
In this example, let us try to add a new record into Customers table. Following are the details of the new record in the table.
Using the following query, let us insert the given record into the H2 database query.
The above query produces the following output.
Let us verify the records of the Customer table by executing the following query.
The above query produces the following output.
Now let us try to update the record using the Merge command. Following are the details of the record to be updated.
Use the following query to insert the given record into the H2 database query.
The above query produces the following output.
Let us verify the records of the Customer table by executing the following query.
The above query produces the following output −
SHOW is a command used to display the list of Schemas, Tables, or Columns of the table.
Syntax
Following is the generic syntax of the SHOW command.
Example
The following command can be used to get the list of tables in the current database.
The above command produces the following output.
CREATE is a generic SQL command used to create Tables, Schemas, Sequences, Views, and Users in H2 Database server.
Create Table
Create Table is a command used to create a user-defined table in the current database.
Syntax
Following is the generic syntax for the Create Table command.
By using the generic syntax of the Create Table command, we can create different types of tables such as cached tables, memory tables, and temporary tables. Following is the list to describe different clauses from the given syntax.
Example
In this example, let us create a table named tutorials_tbl using the following given data.
The following query is used to create a table tutorials_tbl along with the given column data.
The above query produces the following output.
Create Schema
Create Schema is a command used to create a user-dependent schema under a particular authorization (under the currently registered user).
Syntax
Following is the generic syntax of the Create Schema command.
In the above generic syntax, AUTHORIZATION is a keyword used to provide the respective user name. This command is optional which means if we are not providing the user name, then it will consider the current user. Fifa 07 download full version. The user that executes the command must have admin rights, as well as the owner.
This command commits an open transaction in this connection.
Example
In this example, let us create a schema named test_schema under SA user, using the following command.
The above command produces the following output.
Create Sequence
Sequence is concept which is used to generate a number by following a sequence for id or any random column values.
Syntax
Following is the generic syntax of the create sequence command.
This generic syntax is used to create a sequence. The datatype of a sequence is BIGINT. In this the sequence, values are never re-used, even when the transaction is roll backed.
Example
In this example, let us create a sequence named SEQ_ID, using the following query.
The above query produces the following output.
ALTER is a command used to change the table structure by adding different clauses to the alter command. Based on the scenario, we need to add respective clause to the alter command. In this chapter, we will discuss various scenarios of alter command.
Alter Table Add
Alter Table Add is a command used to add a new column to a table along with the respective data type. This command commits the transaction in this connection.
Syntax
Following is the generic syntax of the Alter Table Add command.
Example
In this example, we will add a new column start_date to the table tutorials_tbl. The datatype for start_date is Date. Following is the query to add a new column.
The above query produces the following output.
Alter Table Add Constraint
Alter table add constraint is a command used to add different constraints to the table such as primary key, foreign key, not null, etc.
The required indexes are automatically created if they don’t exist yet. It is not possible to disable checking for unique constraint. This command commits an open transaction in this connection.
Syntax
Following is the generic syntax of the Alter table add constraint command.
Example
In this example, let us add a primary key constraint (tutorials_tbl_pk) to the column id of the table tutorials_tbl, using the following query.
The above query produces the following output.
Alter Table Rename Constraint
This command is used to rename the constraint name of a particular relation table. This command commits an open transaction in this connection.
Syntax
Following is the generic syntax of the Alter Table Rename Constraint command.
While using this syntax, make sure that the old constraint name should exist with the respective column.
Example
In this example, we will change the primary key constraint name of the table tutorials_tbl from tutorials_tbl_pk to tutorials_tbl_pk_constraint. Following is the query to do so.
The above query produces the following output.
Alter Table Alter Column
This command is used to change the structure and properties of the column of a particular table. Changing the properties means changing the datatype of a column, rename a column, change the identity value, or change the selectivity.
Syntax
Following is the generic syntax of the Alter Table Alter Column command.
In the above syntax −
Example
In this example, we will rename the column of the table tutorials_tbl from Title to Tutorial_Title Premiere pro mac crack download. using the following query.
The above query produces the following output.
In a similar way, we can perform different scenarios with the ALTER command.
![]()
DROP is a command taken from the generic SQL grammar. This command is used to delete a database component and its structure from the memory. There are different scenarios with the Drop command that we will discuss in this chapter.
Drop Table
Drop Table is a command that deletes the respective table and its structure.
Syntax
Following is the generic syntax of the Drop Table command.
The command will fail if we are using RESTRICT and the table having dependent views exist. All dependent views are dropped, when we are using CASCADE keyword.
Example
In this example, we will drop a table named test using the following query.
The above query produces the following output.
Drop Schema
Drop Schema is a command that drops a respective schema from the database server. It will not work from the current schema.
SyntaxExample
In this example, we will drop a schema named test_schema using the following query.
The above query produces the following output.
Drop Sequence
Drop Sequence is a command used to drop a sequence from the table structure.
Syntax
Following is the generic syntax of the Drop Sequence command.
This command commits an open transaction in this connection.
Example
In this example, we will drop a sequence named sequence_id. Following is the command.
The above command produces the following output.
Drop View
Drop View is a command used to drop the existing view. All dependent views are dropped as well if the CASCADE clause is used.
Syntax
Following is the generic syntax of the Drop View command.
Example
In this example, we will drop a view named sample_view using the following query.
The above query produces the following output.
TRUNCATE is a command used to delete the data from the table. Unlike DELETE FROM without WHERE clause, this command cannot be rolled back. This command commits an open transaction in this connection.
Syntax
Following is the generic syntax of the truncate command.
Example
In this example, we will truncate a table named test using the following query.
The above query produces the following output.
COMMIT is a command from the SQL grammar used to commit the transaction. We can either commit the specific transaction or we can commit the currently executed transaction.
Syntax
There are two different syntaxes for COMMIT command.
Following is the generic syntax for the commit command to commit the current transaction.
Following is the generic syntax for the commit command to commit the specific transaction.
Example 1
In this example, let us commit the current transaction using the following command.
The above command produces the following output.
Example 2
In this example, we will commit the transaction named tx_test using the following command.
The above command produces the following output.
Grant is a command coming from the SQL grammar used to grant the rights to a table, to a user, or to a role. Admin rights are required to execute this command. This command commits an open transaction in this connection.
In this chapter, we will discuss the different scenarios of Grant command.
Grant Right
Grant Right is a command to provide admin rights to a table, to a user, or to a role.
Syntax
Following is the generic syntax of the Grant command.
Example
In this example, we will grant the test table as read-only using the following command.
The above command produces the following output.
Grant Alter Any Schema
Grant Alter Any Schema is a command to grant schema altering rights to a respective user.
Syntax
Following is the generic syntax of the Grant Alter Any Schema command.
Example
In this example, we will grant altering privileges of a schema to a user named test_user. Make sure that test_user exists. Following is the query to grant altering privileges.
The above query produces the following output.
SAVEPOINT is a command used to temporarily save the transaction. It is better to maintain savepoints in your transaction as it is helpful to roll back the transaction to the respective Savepoint whenever necessary.
Syntax
Following is the generic syntax of the Savepoint command.
Example
In this example, we will create a Savepoint named Half_Done using the following command.
The above command produces the following output.
ROLLBACK is a command from the SQL grammar used to roll back the transaction to a Savepoint or to the previous transaction. By using this command, we can either roll back to the specific Savepoint or we can roll back to the previous executed transaction.
Syntax
There are two different syntaxes for ROLLABCK command.
Following is the generic syntax for the rollback command.
Following is the generic syntax of the Rollback command to the specific transaction.
Example 1
In this example, we will roll back the current transaction to a Savepoint named sp1_test using the following command.
The above command produces the following output.
Example 2
In the following example, we will roll back the complete transaction named tx_test using the given command.
The above command produces the following output.
H2 is a JAVA database. We can interact with this database by using JDBC. In this chapter, we will see how to create a JDBC connection with H2 database and the CRUD operations with the H2 database.
Generally, there are five steps to create a JDBC connection.
Step 1 − Registering the JDBC database driver.
Step 2 − Opening the connection.
Step 3 − Creating a statement.
Step 4 − Executing a statement and receiving Resultset.
Step 5 − Closing a connection.
Before moving on to create a full program, we need to add h2-1.4.192.jar file to CLASSPATH. We can get this jar from the folder C:Program Files (x86)H2bin.
Create Table
In this example, we will write a program for create table. Consider a table named Registration having the following fields.
Following is an example program named H2jdbcCreateDemo.
Download H2 Database For Mac Windows 10
Save the above program into H2jdbcCreateDemo.java. Compile and execute the above program by executing the following commands in the command prompt.
The above command produces the following output.
After this execution, we can check the table created using the H2 SQL interface. Mac microsoft word too fast scrolling game.
Insert Records
In this example, we will write a program for inserting records. Let us insert the following records into the table Registration.
Following is an example program named H2jdbcInsertDemo.
Save the above program into H2jdbcInsertDemo.java. Compile and execute the above program by executing the following commands in the command prompt.
The above command produces the following output.
Read Record
In this example, we will write a program for reading records. Let us try to read all records from the table Registration.
Following is an example program named H2jdbcRecordDemo.
Save the above program into H2jdbcReadDemo.java. Compile and execute the above program by executing the following commands in the command prompt.
The above command produces the following output.
Update Records
In this example, we will write a program to update records. Let us try to read all records from the table Registration.
H2 Database
Following is an example program named H2jdbcUpdateDemo.
Save the above program into H2jdbcUpdateDemo.java. Compile and execute the above program by executing the following commands in the command prompt.
The above command produces the following output.
Delete Records
In this example, we will write a program to delete records. Let us try to read all records from the table Registration.
Following is an example program named H2jdbcDeleteDemo.
Save the above program into H2jdbcDeleteDemo.java. Compile and execute the above program by executing the following commands in the command prompt.
The above command produces the following output.
Comments are closed.
|
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
December 2020
Categories |