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Function SQLAllocHandle() SQLFreeHandle() SQLAllocEnv() SQLFreeEnv() SQLAllocConnect() SQLFreeConnect() SQLAllocStmt() SQLFreeStmt() SQLConnect() SQLDisconnect() Statement execution SQLExecDirect() SQLPrepare() SQLExecute() SQLRowCount() Transaction management SQLEndTran() SQLCancel() Parameter handling SQLBindParam() SQLParamData() SQLPutData() Query results processing SQLSetCursorName() SQLGetCursorName() SQLFetch() SQLFetchScroll() SQLCloseCursor() SQLGetData() Query results description SQLNumResultCols() SQLDescribeCol()
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TABLE 19-2
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Description Allocates resources for environment, connection, descriptor, or statement Frees previously allocated resources Allocates resources for a SQL environment Frees resources for a SQL environment Allocates resources for a database connection Frees resources for a database connection Allocates resources for a SQL statement Frees resources for a SQL statement Establishes a database connection Ends an established database connection Directly executes a SQL statement Prepares a SQL statement for subsequent execution Executes a previously prepared SQL statement Gets number of rows affected by last SQL statement Ends a SQL transaction Cancels execution of a SQL statement Binds program location to a parameter value Processes deferred parameter values Provides deferred parameter value or a portion of a character string value Sets the name of a cursor
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Resource and connection management
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Obtains the name of a cursor Fetches a row of query results Fetches a row of query results with scrolling Closes an open cursor Obtains the value of a query results column Determines the number of query results columns Describes a single query results column
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SQL/CLI API Functions (continued)
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Function SQLColAttribute() SQLGetDescField() SQLSetDescField() SQLGetDescRec() SQLSetDescRec() SQLCopyDesc() Error handling SQLError() SQLGetDiagField() SQLGetDiagRec() Attribute management SQLSetEnvAttr() SQLGetEnvAttr() SQLSetStmtAttr() SQLGetStmtAttr() Driver management SQLDataSources() SQLGetFunctions() SQLGetInfo()
TABLE 19-2
Description Gets attribute of a query results column Gets value of a descriptor field Sets value of a descriptor field Gets values from a descriptor record Sets values in a descriptor record Copies descriptor area values Obtains error information Gets value of a diagnostic record field Gets value of the diagnostic record Sets attribute value for a SQL environment Retrieves attribute value for a SQL environment Sets descriptor area to be used for a SQL statement Gets descriptor area for a SQL statement Gets a list of available SQL servers Gets information about supported features of a SQL implementation Gets information about supported features of a SQL implementation
SQL/CLI API Functions (continued)
CLI Structures
The CLI manages interactions between an application program and a supported database through a hierarchy of concepts, reflected in a hierarchy of CLI data structures: SQL-environment The highest-level environment within which database access takes place. The CLI uses the data structure associated with a SQL-environment to keep track of the various application programs that are using it. SQL-connection A logical connection to a specific database server. Conceptually, the CLI allows a single application program to connect to several different database servers concurrently. Each connection has its own data structure, which the CLI uses to track connection status. SQL-statement An individual SQL statement to be processed by a database server. A statement may move through several stages of processing, as the DBMS prepares (compiles) it, executes it, processes any errors, and in the case of queries, returns the results to the application program. Conceptually, an application program may have multiple SQL statements moving through these processing stages in parallel. Each statement has its own data structure, which the CLI uses to track its progress.
19:
SQL APIs
/* Program to raise all quotas by a user-specified amount */ #include <sqlcli.h> main() { SQLHENV SQLHDBC SQLHSTMT SQLRETURN char char char char char env_hdl; conn_hdl; stmt_hdl; status; *svr_name = "demo"; *user_name = "joe"; *user_pswd = "xyz"; amount_str[31]; stmt_buf[128]; /* SQL-environment handle */ /* connection handle */ /* statement handle */ /* CLI routine return status */ /* server name */ /* user name for connection */ /* user password for connection */ /* amount entered by user */ /* buffer for SQL statement */ /* header file with CLI definitions */
/* Allocate handles for SQL environment, connection, statement */ SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &env_hdl); SQLAllocHandle(SQL_HANDLE_DBC, env_hdl, &conn_hdl); SQLAllocHandle(SQL_HANDLE_STMT, conn_hdl, &stmt_hdl); /* Connect to the database, passing server name, user, password */ /* SQL_NTS says NULL-terminated string instead of passing length */ SQLConnect(conn_hdl, svr_name, SQL_NTS, user_name, SQL_NTS, user_pswd, SQL_NTS); /* Prompt the user for the amount of quota increase/decrease */ printf("Raise/lower quotas by how much: "); gets(amount_str); /* Assemble UPDATE statement and ask DBMS to execute it */ strcpy(stmt_buf, "update salesreps set quota = quota + "); strcat(stmt_buf, amount_str); status = SQLExecDirect(stmt_hdl, stmt_buf, SQL_NTS); /* Commit if successful; rollback if not */ if (status) { SQLEndTran(SQL_HANDLE_ENV, env_hdl, SQL_ROLLBACK); printf("Error during update\n"); } else { SQLEndTran(SQL_HANDLE_ENV, env_hdl, SQL_COMMIT); printf("Update successful.\n"); } /* Disconnect from database server */ SQLDisconnect(conn_hdl); /* Deallocate handles and exit */ SQLFreeHandle(SQL_HANDLE_STMT, stmt_hdl); SQLFreeHandle(SQL_HANDLE_DBC, conn_hdl); SQLFreeHandle(SQL_HANDLE_ENV, env_hdl); exit(); }
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