DBExec también

Funciones de interfaz de base de datos.

Objeto que contiene el resultado de la ejecución de unCuadradouna declaración, por ejemplo:

{"columns":["TS","HIGH","OPEN","LOW","CLOSE","VOLUME"],"values":[[1518970320000,100,99.1,90,100,12345.6]]}

objetos

DBExec (sql)

Cuadradola cadena de instrucciones. Cuadrado verdadero la cuerda

function main() {
    var strSql = [
        ":CREATE TABLE TEST_TABLE(", 
        "TS INT PRIMARY KEY NOT NULL,",
        "HIGH REAL NOT NULL,", 
        "OPEN REAL NOT NULL,", 
        "LOW REAL NOT NULL,", 
        "CLOSE REAL NOT NULL,", 
        "VOLUME REAL NOT NULL)"
    ].join("")
    var ret = DBExec(strSql)
    Log(ret)
    
    // Add a piece of data
    Log(DBExec(":INSERT INTO TEST_TABLE (TS, HIGH, OPEN, LOW, CLOSE, VOLUME) VALUES (1518970320000, 100, 99.1, 90, 100, 12345.6);"))
    
    // Query data
    Log(DBExec(":SELECT * FROM TEST_TABLE;"))
}

def main():
    arr = [
        ":CREATE TABLE TEST_TABLE(", 
        "TS INT PRIMARY KEY NOT NULL,",
        "HIGH REAL NOT NULL,", 
        "OPEN REAL NOT NULL,", 
        "LOW REAL NOT NULL,", 
        "CLOSE REAL NOT NULL,", 
        "VOLUME REAL NOT NULL)"
    ]
    strSql = ""
    for i in range(len(arr)):
        strSql += arr[i]
    ret = DBExec(strSql)
    Log(ret)
    
    # Add a piece of data
    Log(DBExec(":INSERT INTO TEST_TABLE (TS, HIGH, OPEN, LOW, CLOSE, VOLUME) VALUES (1518970320000, 100, 99.1, 90, 100, 12345.6);"))
    
    # Query data
    Log(DBExec(":SELECT * FROM TEST_TABLE;"))

void main() {
    string strSql = ":CREATE TABLE TEST_TABLE(\
        TS INT PRIMARY KEY NOT NULL,\
        HIGH REAL NOT NULL,\
        OPEN REAL NOT NULL,\
        LOW REAL NOT NULL,\
        CLOSE REAL NOT NULL,\
        VOLUME REAL NOT NULL)";
    auto ret = DBExec(strSql);
    Log(ret);
    
    // Add a piece of data
    Log(DBExec(":INSERT INTO TEST_TABLE (TS, HIGH, OPEN, LOW, CLOSE, VOLUME) VALUES (1518970320000, 100, 99.1, 90, 100, 12345.6);"));
    
    // Query data
    Log(DBExec(":SELECT * FROM TEST_TABLE;"));
}

Apoyo a la base de datos en memoria, paraDBExecparámetros de función, siCuadradola declaración comienza con:Es adecuado para operaciones de base de datos que no requieren de un almacenamiento persistente, por ejemplo:

function main() {
    var strSql = [
        "CREATE TABLE TEST_TABLE(", 
        "TS INT PRIMARY KEY NOT NULL,",
        "HIGH REAL NOT NULL,", 
        "OPEN REAL NOT NULL,", 
        "LOW REAL NOT NULL,", 
        "CLOSE REAL NOT NULL,", 
        "VOLUME REAL NOT NULL)"
    ].join("")
    var ret = DBExec(strSql)
    Log(ret)
}

def main():
    arr = [
        "CREATE TABLE TEST_TABLE(", 
        "TS INT PRIMARY KEY NOT NULL,",
        "HIGH REAL NOT NULL,", 
        "OPEN REAL NOT NULL,", 
        "LOW REAL NOT NULL,", 
        "CLOSE REAL NOT NULL,", 
        "VOLUME REAL NOT NULL)"
    ]
    strSql = ""
    for i in range(len(arr)):
        strSql += arr[i]
    ret = DBExec(strSql)
    Log(ret)

void main() {
    string strSql = "CREATE TABLE TEST_TABLE(\
        TS INT PRIMARY KEY NOT NULL,\
        HIGH REAL NOT NULL,\
        OPEN REAL NOT NULL,\
        LOW REAL NOT NULL,\
        CLOSE REAL NOT NULL,\
        VOLUME REAL NOT NULL)";
    auto ret = DBExec(strSql);
    Log(ret);
}

Crea una mesa.

function main() {
    var strSql = [
        "CREATE TABLE TEST_TABLE(", 
        "TS INT PRIMARY KEY NOT NULL,",
        "HIGH REAL NOT NULL,", 
        "OPEN REAL NOT NULL,", 
        "LOW REAL NOT NULL,", 
        "CLOSE REAL NOT NULL,", 
        "VOLUME REAL NOT NULL)"
    ].join("")
    Log(DBExec(strSql))
    
    // Add a piece of data
    Log(DBExec("INSERT INTO TEST_TABLE (TS, HIGH, OPEN, LOW, CLOSE, VOLUME) VALUES (1518970320000, 100, 99.1, 90, 100, 12345.6);"))
    
    // Query data
    Log(DBExec("SELECT * FROM TEST_TABLE;"))
    
    // Modify data
    Log(DBExec("UPDATE TEST_TABLE SET HIGH=? WHERE TS=?", 110, 1518970320000))    
    
    // Delete data
    Log(DBExec("DELETE FROM TEST_TABLE WHERE HIGH=?", 110))
}

def main():
    arr = [
        "CREATE TABLE TEST_TABLE(", 
        "TS INT PRIMARY KEY NOT NULL,",
        "HIGH REAL NOT NULL,", 
        "OPEN REAL NOT NULL,", 
        "LOW REAL NOT NULL,", 
        "CLOSE REAL NOT NULL,", 
        "VOLUME REAL NOT NULL)"
    ]
    strSql = ""
    for i in range(len(arr)):
        strSql += arr[i]
    Log(DBExec(strSql))
    
    # Add a piece of data
    Log(DBExec("INSERT INTO TEST_TABLE (TS, HIGH, OPEN, LOW, CLOSE, VOLUME) VALUES (1518970320000, 100, 99.1, 90, 100, 12345.6);"))
    
    # Query data
    Log(DBExec("SELECT * FROM TEST_TABLE;"))
    
    # Modify data
    Log(DBExec("UPDATE TEST_TABLE SET HIGH=? WHERE TS=?", 110, 1518970320000))
    
    # Delete data
    Log(DBExec("DELETE FROM TEST_TABLE WHERE HIGH=?", 110))

void main() {
    string strSql = "CREATE TABLE TEST_TABLE(\
        TS INT PRIMARY KEY NOT NULL,\
        HIGH REAL NOT NULL,\
        OPEN REAL NOT NULL,\
        LOW REAL NOT NULL,\
        CLOSE REAL NOT NULL,\
        VOLUME REAL NOT NULL)";
    Log(DBExec(strSql));            

    // Add a piece of data
    Log(DBExec("INSERT INTO TEST_TABLE (TS, HIGH, OPEN, LOW, CLOSE, VOLUME) VALUES (1518970320000, 100, 99.1, 90, 100, 12345.6);"));
    
    // Query data
    Log(DBExec("SELECT * FROM TEST_TABLE;"));
    
    // Modify data
    Log(DBExec("UPDATE TEST_TABLE SET HIGH=? WHERE TS=?", 110, 1518970320000));
    
    // Delete data
    Log(DBExec("DELETE FROM TEST_TABLE WHERE HIGH=?", 110));
}

Añadir, borrar, comprobar y cambiar los registros en la tabla.

La funciónDBExec()Puede operar la base de datos de operaciones en vivo (base de datos SQLite) mediante el paso de parámetros.Es muy bueno.El sistema reservó tablas en la base de datos de operaciones en vivo:kvdb, cfg, log, profit, chart, no opere en estas mesas.Las transaccionesLas funciones de control de los datos no son compatibles y no se recomienda realizar tales operaciones, que pueden causar conflictos en el sistema.DBExec()La función solo es compatible con el comercio en vivo.

¿Por qué no lo haces?

El MD5 UUID