Easy Language EDB Database Tutorial: A Comprehensive Guide18

Introduction

Easy Language is a powerful and versatile programming language specifically designed for financial analysis and trading. It offers a comprehensive set of functionalities, including the ability to create and manipulate EDB databases. EDB databases are proprietary to Easy Language and are used to store and manage data efficiently. This tutorial will provide a comprehensive guide to working with EDB databases using Easy Language.

Step 1: Creating an EDB Database

To create an EDB database, use the 'CreateEDB' function. This function takes two parameters: the name of the database and the path where it should be saved. For example:```
CreateEDB("MyDatabase", "C:Path\To\Database")
```

Step 2: Connecting to the Database

Once the database is created, you need to establish a connection to it. Use the 'OpenEDB' function to open a connection to the database. This function takes one parameter: the name of the database. For example:```
OpenEDB("MyDatabase")
```

Step 3: Creating a Table

Tables are used to store data in EDB databases. To create a table, use the 'CreateTable' function. This function takes two parameters: the name of the table and a list of field definitions. Each field definition includes the field name, data type, and other properties. For example:```
CreateTable("MyTable",
[
["ID", "INTEGER", "NOT NULL", "PRIMARY KEY"],
["Name", "TEXT", "NOT NULL"],
["Age", "INTEGER", "NOT NULL"]
]
)
```

Step 4: Inserting Data

To insert data into a table, use the 'Insert' function. This function takes three parameters: the name of the table, a list of field names, and a list of corresponding values. For example:```
Insert("MyTable", ["ID", "Name", "Age"], [1, "John", 30])
```

Step 5: Retrieving Data

To retrieve data from a table, use the 'Query' function. This function takes two parameters: the name of the table and a filter expression. The filter expression specifies the criteria for selecting the data. For example, to retrieve all rows from the 'MyTable' where 'Age' is greater than 30, use:```
Query("MyTable", "Age > 30")
```

Step 6: Updating Data

To update data in a table, use the 'Update' function. This function takes four parameters: the name of the table, a list of field names to update, a list of corresponding values, and a filter expression. For example, to update the 'Name' field for all rows where 'Age' is greater than 30, use:```
Update("MyTable", ["Name"], ["NewName"], "Age > 30")
```

Step 7: Deleting Data

To delete data from a table, use the 'Delete' function. This function takes two parameters: the name of the table and a filter expression. The filter expression specifies the criteria for selecting the rows to delete. For example, to delete all rows from the 'MyTable' where 'Age' is greater than 30, use:```
Delete("MyTable", "Age > 30")
```

Step 8: Closing the Connection

After completing your operations on the database, it is important to close the connection. Use the 'CloseEDB' function to close the connection. This function takes one parameter: the name of the database. For example:```
CloseEDB("MyDatabase")
```

Conclusion

This tutorial has provided a comprehensive overview of working with EDB databases using Easy Language. By following these steps, you can effectively create, manage, and manipulate data in your EDB databases, enhancing your analysis and trading capabilities within the Easy Language platform.

2024-11-27

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