These classes provide access to SQL databases.
| QSql | Namespace for Qt SQL identifiers that need to be global-like
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| QSqlDatabase | Represents a connection to a database
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| QSqlDriver | Abstract base class for accessing SQL databases
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| QSqlError | SQL database error information
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| QSqlField | Manipulates the fields in SQL database tables and views
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| QSqlIndex | Functions to manipulate and describe QSqlCursor and QSqlDatabase indexes
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| QSqlQuery | Means of executing and manipulating SQL statements
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| QSqlQueryModel | Read only data model for SQL result sets
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| QSqlRecord | Encapsulates a database record, i.e. a set of database fields
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| QSqlRelationalTableModel | Editable data model for a single database table. In addition, columns can be set as foreign keys into another table
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| QSqlResult | Abstract interface for accessing data from SQL databases
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| QSqlTableModel | Editable data model for a single database table
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